Works (110)

Updated: April 8th, 2024 04:49

2023 article

A Systematic Review and Quantitative Synthesis of the Efficacy of Quaternary Ammonium Compounds in Disinfesting Nonfungal Plant Pathogens

Copes, W. E., & Ojiambo, P. S. (2023, March 8). PLANT DISEASE, Vol. 3.

By: W. Copes* & P. Ojiambo n

author keywords: bacteria; disinfectant; oomycete; plant pathogen; quaternary ammonium compounds (QACs); quats; sanitizer; viruses and viroids
TL;DR: While QACs are moderately effective against non-fungal plant pathogens, the observed variability in their efficacy due to dose of active ingredient and contact time of these products can be influenced by organism type, genus within organismtype, the target being treated, and the generation of QAC products. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: November 27, 2023

2023 article

A Systematic Review and Quantitative Synthesis of the Efficacy of Quaternary Ammonium Disinfestants Against Fungal Plant Pathogens

Copes, W. E. E., & Ojiambo, P. S. S. (2023, February 15). PLANT DISEASE, Vol. 2.

By: W. Copes* & P. Ojiambo n

author keywords: disinfectant; fungi; plant pathogen; QAC; quats; sanitizer
MeSH headings : Ammonium Compounds; Quaternary Ammonium Compounds / pharmacology; Wood; Agriculture
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: April 4, 2023

2023 article

Effects of Host and Weather Factors on the Growth Rate of Septoria nodorum Blotch Lesions on Winter Wheat

Adhikari, U., Brown, J., Ojiambo, P. S., & Cowger, C. (2023, May 5). PHYTOPATHOLOGY, Vol. 5.

By: U. Adhikari n, J. Brown*, P. Ojiambo n & C. Cowger n

author keywords: disease resistance; lesion growth rate; lesion size; Parastagonospora nodorum; partial resistance; Septoria nodorum blotch
Sources: Web Of Science, NC State University Libraries, ORCID
Added: November 8, 2023

2023 review

Efficacy of peroxygen disinfestants against fungal plant pathogens. A systemic review and meta-analysis

[Review of ]. CROP PROTECTION, 164.

By: W. Copes* & P. Ojiambo n

author keywords: Hydrogen peroxide; Hydrogen dioxide; Peracetic acid; Peroxyacetic acid; Disinfectant; Sanitizer
Sources: Web Of Science, NC State University Libraries
Added: January 9, 2023

2023 journal article

Evaluation of a Model for Predicting Onset of Septoria nodorum Blotch in Winter Wheat

PLANT DISEASE, 107(4), 1122–1130.

By: U. Adhikari n, C. Cowger* & P. Ojiambo n

author keywords: cereals and grains; disease development and spread; disease onset; disease warning systems; epidemiology; field crops; model accuracy; prediction model; sensitivity; yield
Sources: Web Of Science, NC State University Libraries, ORCID
Added: September 15, 2023

2023 article

Within-Season Shift in Fungicide Sensitivity Profiles of Pseudoperonospora cubensis Populations in Response to Chemical Control

Kikway, I., Keinath, A. P., & Ojiambo, P. S. (2023, April 28). PLANT DISEASE, Vol. 4.

By: I. Kikway n, A. Keinath* & P. Ojiambo n

author keywords: chemical; cucurbits; disease management; downy mildew; fungicide sensitivity; oomycetes; resistance selection; vegetables
MeSH headings : Fungicides, Industrial / pharmacology; Seasons; Plant Diseases / prevention & control; Oomycetes
TL;DR: Results indicate that a shift towards reduced sensitivity in P. cubensis can occur during a growing season and the efficacy of fluopicolide is likely to decrease as the frequency of the less sensitive subpopulations increases during a production season. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: May 30, 2023

2022 article

Dataset for transcriptomic profiles associated with development of sexual structures in Aspergillus flavus

Luis, J. M., Carbone, I., Mack, B. M., Lebar, M. D., Cary, J. W., Gilbert, M. K., … Ojiambo, P. S. (2022, June). DATA IN BRIEF, Vol. 42.

By: J. Luis n, I. Carbone n, B. Mack*, M. Lebar*, J. Cary*, M. Gilbert*, D. Bhatnagar*, C. Wientjes* ...

author keywords: Fertility; Sclerotia; Sexual development; Transcriptional analysis
TL;DR: Transcriptomic datasets included in the research article entitled, “Development of sexual structures influences metabolomic and transcriptomic profiles in Aspergillus flavus”, which utilized transcriptomics to identify possible genes and gene clusters associated with sexual reproduction and fertilization in A. flavus are presented. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: April 25, 2022

2022 journal article

Development of sexual structures influences metabolomic and transcriptomic profiles in Aspergillus flavus

FUNGAL BIOLOGY, 126(3), 187–200.

By: J. Luis n, I. Carbone n, B. Mack*, M. Lebar*, J. Cary*, M. Gilbert*, D. Bhatnagar*, C. Wientjes* ...

author keywords: Fertility; Sclerotia; Secondary metabolites; Sexual development; Transcriptional analysis
MeSH headings : Aflatoxins / metabolism; Aspergillus flavus; Gene Expression Profiling; Metabolomics; Reproduction / genetics; Transcriptome
TL;DR: The results broaden knowledge of the biochemical and transcriptional processes during sexual development in A. flavus and show that successful mating between compatible strains may result in relatively high or low numbers of ascocarps being produced. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: March 14, 2022

2022 article

Field Occurrence and Overwintering of Oospores of Pseudoperonospora cubensis in the Southeastern United States

Kikway, I., Keinath, A. P., & Ojiambo, P. S. (2022, August 8). PHYTOPATHOLOGY, Vol. 8.

By: I. Kikway n, A. Keinath* & P. Ojiambo n

author keywords: cucurbits; dormancy; ecology; germination; oomycetes; oospore formation; oospore viability; pathogen survival
MeSH headings : Cucumis melo; Cucumis sativus; North Carolina; Oomycetes; Peronospora; Plant Diseases; Soil; United States
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 22, 2022

2022 article

Genetic association of agronomic traits with partial resistance to gray leaf spot in elite maize germplasm

Nyanapah, J. O., Ayiecho, P. O., Nyabundi, J. O., Otieno, W., & Ojiambo, P. S. (2022, October 9). CROP SCIENCE, Vol. 10.

By: J. Nyanapah*, P. Ayiecho*, J. Nyabundi*, W. Otieno* & P. Ojiambo n

UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science; OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: October 24, 2022

2022 journal article

Impact of frequency of application on the long-term efficacy of the biocontrol product Aflasafe in reducing aflatoxin contamination in maize

FRONTIERS IN MICROBIOLOGY, 13.

By: J. Atehnkeng*, P. Ojiambo n, A. Ortega-Beltran*, J. Augusto*, P. Cotty* & R. Bandyopadhyay*

author keywords: maize; aflatoxins; atoxigenic isolates; biocontrol; carry-over
Sources: Web Of Science, NC State University Libraries
Added: January 3, 2023

2022 journal article

Temporal Dynamics and Severity of Cucurbit Downy Mildew Epidemics as Affected by Chemical Control and Cucurbit Host Type

PLANT DISEASE, 106(3), 1009–1019.

By: I. Kikway n, A. Keinath* & P. Ojiambo n

author keywords: cucumber; disease progress; epidemiology; fungicide; oomycete; summer squash
MeSH headings : Cucurbitaceae; Epidemics; Oomycetes; Peronospora; Plant Diseases / prevention & control
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: July 26, 2022

2021 journal article

"Jumping Jack ": Genomic Microsatellites Underscore the Distinctiveness of Closely Related Pseudoperonospora cubensis and Pseudoperonospora humuli and Provide New Insights Into Their Evolutionary Past

FRONTIERS IN MICROBIOLOGY, 12.

By: M. Nowicki*, D. Hadziabdic*, R. Trigiano*, S. Boggess*, L. Kanetis*, P. Wadl*, P. Ojiambo n, M. Cubeta n ...

author keywords: oomycete; obligate pathogens; downy mildew; speciation; evolution; genotyping; host specificity
TL;DR: Genetic diversity, modest gene flow, and presence of population structure, particularly in P. cubensis, provided a definite argument for the hypothesis that both pathogens are distinct species, and suggested further speciation in the P. Cubensis complex. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 9, 2021

2021 journal article

A General Framework for Spatio-Temporal Modeling of Epidemics With Multiple Epicenters: Application to an Aerially Dispersed Plant Pathogen

FRONTIERS IN APPLIED MATHEMATICS AND STATISTICS, 7.

By: A. Ojwang' n, T. Ruiz*, S. Bhattacharyya*, S. Chatterjee*, P. Ojiambo n & D. Gent*

author keywords: long-distance dispersal; anisotrophy; spatio-temporal models; inoculum source; cucurbit downy mildew
TL;DR: A flexible class of phenomenological spatio-temporal models that extend a modeling framework used in plant pathology applications to account for the presence of multiple sources and anisotropy of biological species that can govern disease gradients and spatial spread in time are developed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: December 13, 2021

2021 review

Efficacy of Hypochlorite as a Disinfestant Against Fungal Pathogens in Agricultural and Horticultural Plant Production: A Systematic Review and Meta-Analysis

[Review of ]. PHYTOPATHOLOGY, 111(8), 1369–1379.

By: W. Copes* & P. Ojiambo n

author keywords: analytical and theoretical plant pathology; bleach; disinfestation; meta-regression; systematic synthesis
MeSH headings : Fungi; Hypochlorous Acid; Plant Diseases
TL;DR: The results show that although the current recommended dose and contact time for commercial bleach products are expected to result in effective disinfestation, the target material and genera of the fungal pathogen of interest will likely influence their efficacy. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: November 29, 2021

2021 journal article

Efficacy of Hypochlorite in Disinfesting Nonfungal Plant Pathogens in Agricultural and Horticultural Plant Production: A Meta-Analysis

PLANT DISEASE, 105(12), 4084–4094.

By: W. Copes* & P. Ojiambo n

author keywords: bacteria; bleach; disease management; disinfestation; field crops; metaregression; oomycetes; ornamentals; prokaryotes; systematic synthesis; trees; tropical plants; vegetables; viruses and viroids
MeSH headings : Hypochlorous Acid
TL;DR: Although the current recommended rates for dose and contact time for commercial bleach products are generally expected to result in effective disinfestation, the efficacy against non-fungal plant pathogens is expected to be influenced by the organism type and target being treated with hypochlorite. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, NC State University Libraries
Added: February 21, 2022

2021 article

Need for speed: bacterial effector XopJ2 is associated with increased dispersal velocity of Xanthomonas perforans

Sharma, A., Timilsina, S., Abrahamian, P., Minsavage, G. V., Colee, J., Ojiambo, P. S., … Jones, J. B. (2021, June 8). ENVIRONMENTAL MICROBIOLOGY, Vol. 6.

MeSH headings : Solanum lycopersicum / microbiology; Plant Diseases / microbiology; Xanthomonas / genetics
TL;DR: The results show that the presence of a single gene can affect the dispersal of a bacterial pathogen and significantly alter its population dynamics. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: June 21, 2021

2020 journal article

Characterization of morphological changes within stromata during sexual reproduction inAspergillus flavus

MYCOLOGIA, 112(5), 908–920.

author keywords: Ascocarp; ascospore; morphogenesis; sclerotium; stroma
MeSH headings : Aspergillus flavus / cytology; Aspergillus flavus / genetics; Aspergillus flavus / growth & development; Fertility; Food Contamination; Fruiting Bodies, Fungal / cytology; Fruiting Bodies, Fungal / genetics; Fruiting Bodies, Fungal / growth & development; Genetic Variation; Genotype; Humans; Mycotoxins; Plant Development / genetics; Plant Development / physiology; Reproduction / genetics; Reproduction / physiology; Spores, Fungal / cytology; Spores, Fungal / genetics; Spores, Fungal / growth & development
TL;DR: Observations broaden knowledge of early events during sexual reproduction and suggest that hyphae from the conidium-producing strain may be involved in the early stages of sexual reproduction in A. flavus. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: September 7, 2020

2020 journal article

Field Characterization of Partial Resistance to Gray Leaf Spot in Elite Maize Germplasm

PHYTOPATHOLOGY, 110(10), 1668–1679.

By: J. Nyanapah*, P. Ayiecho*, J. Nyabundi*, W. Otieno* & P. Ojiambo n

author keywords: Cercospora zeina; disease resistance components; ecology and epidemiology; epidemic rate; quantitative resistance; Zea mays
MeSH headings : Disease Resistance / genetics; Humans; Kenya; Plant Diseases; Quantitative Trait Loci; Zea mays / genetics
TL;DR: Inbred lines significantly affected all measures of disease epidemic except IP, and individual disease ratings at the R4 stage of plant development were nearly as effective as SAUDPC in discerning the differential reaction of test genotypes. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, NC State University Libraries
Added: October 26, 2020

2019 journal article

Biocontrol Strains Differentially Shift the Genetic Structure of Indigenous Soil Populations of Aspergillus flavus

Frontiers in Microbiology, 10.

By: M. Lewis n, I. Carbone n, J. Luis n, G. Payne n, K. Bowen*, A. Hagan*, R. Kemerait*, R. Heiniger n, P. Ojiambo n

author keywords: aflatoxin; Aspergillus section Flavi; biological control; lineage; mating type
TL;DR: Phylogenetic analysis showed that Afla-Guard was more effective than AF36 in shifting the indigenous soil populations of A. flavus toward the non-toxigenic or low aflatoxin producing IB lineage and patristic distance analysis revealed phylogenetic incongruency among single locus phylogenies which suggests ongoing genetic exchange and recombination. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: August 12, 2019

2019 journal article

Spread of Aspergillus flavus and aflatoxin accumulation in postharvested maize treated with biocontrol products

Journal of Stored Products Research, 84, 101519.

By: S. Kinyungu*, T. Isakeit*, P. Ojiambo n & C. Woloshuk*

author keywords: Aspergillus flavus; Aflatoxin; Afla-guard; AF36; Aflasafe; Postharvest; Maize
TL;DR: To determine if the efficacy of preharvest biocontrol treatments carry over into the postharvest drying period, the time between harvest and the point when grain moisture is safe for storage in Sub-Sahara Africa, this period often is extended by weather and the complexities of postHarvest drying practices. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2018 journal article

Cultural and Genetic Approaches to Manage Aflatoxin Contamination: Recent Insights Provide Opportunities for Improved Control

Phytopathology, 108(9), 1024–1037.

By: P. Ojiambo n, P. Battilani n, J. Cary n, B. Blum n & I. Carbone n

MeSH headings : Aflatoxins / metabolism; Aspergillus flavus / chemistry; Aspergillus flavus / physiology; Crops, Agricultural; Disease Resistance; Food Contamination / prevention & control; Plant Diseases / immunology; Plant Diseases / microbiology; Plant Diseases / prevention & control; Plants, Genetically Modified; Zea mays / genetics; Zea mays / immunology; Zea mays / microbiology
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: October 16, 2018

2018 journal article

Evaluation of a Model for Predicting the Infection Risk of Squash and Cantaloupe by Pseudoperonospora cubensis

PLANT DISEASE, 102(5), 855–862.

By: K. Neufeld n, A. Keinath* & P. Ojiambo n

MeSH headings : Cucumis melo / microbiology; Cucurbita / microbiology; Models, Biological; Oomycetes / physiology; Plant Diseases / microbiology; Risk Factors
TL;DR: This 24-h model, previously developed using cucumber as the host, resulted in accurate estimates of the daily infection risk of squash and cantaloupe and could potentially be useful when incorporated into a decision support tool to guide fungicide applications to manage downy mildew in these other cucurbit host types. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2018 journal article

Predicting the risk of cucurbit downy mildew in the eastern United States using an integrated aerobiological model

INTERNATIONAL JOURNAL OF BIOMETEOROLOGY, 62(4), 655–668.

By: K. Neufeld n, A. Keinath*, B. Gugino*, M. McGrath*, E. Sikora*, S. Miller*, M. Ivey*, D. Langston* ...

author keywords: Aerobiological modeling system; Cucurbit downy mildew; Risk prediction; True skill statistic; ROC analysis; Spore deposition
MeSH headings : Cucurbitaceae; Forecasting; Models, Theoretical; Mycoses; Oomycetes; Plant Diseases; Rain / microbiology; Risk; United States
TL;DR: The disease forecasting system had an acceptable to good performance in predicting the risk of cucurbit downy mildew outbreak in the eastern United States. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2018 journal article

Pseudoperonospora cubensis virulence and pathotype structure in Kazakhstan

PLANT PATHOLOGY, 67(9), 1924–1935.

By: A. Rsaliyev, N. Amirkhanova, N. Rametov, Z. Pahratdinova, P. Ojiambo n & A. Lebeda*

author keywords: Cucumis sativus; cucurbit downy mildew; differential set; pathogen population; virulence diversity; virulence factors
TL;DR: A. S. Rsaliyev*, N. Amirkhanova, N. Pahratdinova, P. Ojiambo and A. Lebeda present a probabilistic procedure for determining the phytochemical properties of E.coli found in Zhambylskaya Oblast and it is shown that E. coli can be sexually transmitted through contact chemoreception, a process known as "spatially aggregating". (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: November 26, 2018

2018 journal article

Resistance to Fluopicolide and Propamocarb and Baseline Sensitivity to Ethaboxam Among Isolates of Pseudoperonospora cubensis From the Eastern United States

Plant Disease, 102(8), 1619–1626.

By: A. Thomas n, K. Neufeld n, K. Seebold*, C. Braun n, M. Schwarz n & P. Ojiambo n

MeSH headings : Benzamides / pharmacology; Carbamates / pharmacology; Cucurbitaceae / microbiology; Drug Resistance, Fungal / drug effects; Fungicides, Industrial / pharmacology; Georgia; Michigan; Microbial Sensitivity Tests; New Jersey; New York; North Carolina; Ohio; Oomycetes / classification; Oomycetes / drug effects; Oomycetes / physiology; Plant Diseases / microbiology; Species Specificity; Thiazoles / pharmacology; Thiophenes / pharmacology
TL;DR: Results show that ethaboxam could be a viable addition to fungicide programs used to control CDM in the United States, and establish the baseline sensitivity of P. cubensis isolates were highly sensitive to ethABoxam. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2018 article

Septoria nodorum blotch of wheat

Mehra, L., Adhikari, U., Cowger, C., & Ojiambo, P. S. (2018, July). (Vol. 7). Vol. 7.

By: L. Mehra*, U. Adhikari n, C. Cowger n & P. Ojiambo n

Source: ORCID
Added: December 19, 2019

2018 article

Septoria nodorum blotch of wheat

Mehra, L., Adhikari, U., Cowger, C., & Ojiambo, P. S. (2018, July). (Vol. 7). Vol. 7.

By: L. Mehra*, U. Adhikari n, C. Cowger n & P. Ojiambo n

TL;DR: Septoria nodorum blotch occurs in wheat-growing areas worldwide, but the disease is more prevalent in areas with warm and moist weather, such as the southeastern United States, parts of Europe, southern Brazil, and Australia. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2018 article

Septoria nodorum blotch of wheat

Mehra, L., Adhikari, U., Cowger, C., & Ojiambo, P. S. (2018, July). (Vol. 7). Vol. 7.

By: L. Mehra*, U. Adhikari n, C. Cowger n & P. Ojiambo n

Source: ORCID
Added: December 19, 2019

2017 journal article

A Model for Predicting Onset of Stagonospora nodorum Blotch in Winter Wheat Based on Preplanting and Weather Factors

PHYTOPATHOLOGY, 107(6), 635–644.

By: L. Mehra n, C. Cowger n & P. Ojiambo n

author keywords: model accuracy
MeSH headings : Ascomycota / physiology; Data Accuracy; Host-Pathogen Interactions; Logistic Models; Models, Statistical; Plant Diseases / microbiology; Plant Leaves / microbiology; Triticum / microbiology; Weather
TL;DR: Binary logistic regression models were developed to predict the occurrence and onset of SNB using preplanting factors and cumulative daily infection values starting 1 to 3 weeks prior to DOY 102, and this disease onset prediction model could serve as a useful decision support tool to guide fungicide applications to manage SNB in wheat. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2017 journal article

A model to predict the risk of infection of cucumber by Pseudoperonospora cubensis

Microbial Risk Analysis, 6, 21–30.

By: K. Neufeld n, A. Keinath* & P. Ojiambo n

author keywords: Decision threshold; Disease development; Infection; Risk model; ROC analysis
TL;DR: These logistic regression models provide accurate estimates of the daily infection risk of cucumber by P. cubensis and could serve as a useful decision support tool to guide fungicide applications to manage CDM during the growing season. (via Semantic Scholar)
Sources: Crossref, NC State University Libraries
Added: February 10, 2020

2017 article

CHAPTER 16: Survival Analysis of Time-to-Event Data in Botanical Epidemiology

Ojiambo, P. S., Ngugi, H. K., & Scherm, H. (Eds.). (2017, August 2). Exercises in Plant Disease Epidemiology, Second Edition, pp. 121–127.

Peter Ojiambo

Ed(s): P. Ojiambo*, H. Ngugi & H. Scherm

Source: ORCID
Added: December 19, 2019

2017 journal article

Epidemiology: Past, Present, and Future Impacts on Understanding Disease Dynamics and Improving Plant Disease Management-A Summary of Focus Issue Articles.

Phytopathology, 10.

By: O. Ps n, Y. J n, . Bosch F & M. Lv n

MeSH headings : Agriculture; Disease Resistance; Epidemics; Plant Diseases / prevention & control; Plant Diseases / statistics & numerical data; Plant Pathology
TL;DR: This Focus Issue of Phytopathology features research articles that address broad themes in epidemiology including social and political consequences of disease epidemics, decision theory and support, pathogen dispersal and disease spread, disease assessment and pathogen biology and disease resistance. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: ORCID
Added: December 19, 2019

2017 journal article

Epidemiology: Past, present, and future impacts on understanding disease dynamics and improving plant disease management-a summary of focus issue articles

Phytopathology, 107(10), 1092–1094.

By: P. Ojiambo, J. Yuen, F. Bosch & L. Madden

Source: NC State University Libraries
Added: August 6, 2018

2017 journal article

Focus expansion and stability of the spread parameter estimate of the power law model for dispersal gradients

PEERJ, 5.

By: P. Ojiambo n, D. Gent*, L. Mehra n, D. Christie n & R. Magarey n

author keywords: Inverse power law; Dispersive waves; Epidemic spread; Parameter stability; Long-distance dispersal
TL;DR: Analysis of empirical data of cucurbit downy mildew epidemics collected from 2008 to 2014 were analyzed using a spatio-temporal model of disease spread that incorporates logistic growth in time with a power law function for dispersal, suggesting that the spread parameter b may not be stable over multiple epidemic years. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (OpenAlex)
13. Climate Action (Web of Science)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: August 6, 2018

2017 journal article

Occurrence and Distribution of Mating Types of Pseudoperonospora cubensis in the United States

Phytopathology, 107(3), 313–321.

By: A. Thomas n, I. Carbone n, Y. Cohen n & P. Ojiambo n

MeSH headings : Cucumis melo / parasitology; Cucumis sativus / parasitology; Oomycetes / genetics; Oomycetes / isolation & purification; Plant Diseases / parasitology; Reproduction
TL;DR: It is shown that A1 and A2 mating types of P. cubensis are present and the pathogen could potentially reproduce sexually in cucurbits within the United States. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: August 6, 2018

2017 journal article

Resurgence of cucurbit downy mildew in the United States: Insights from comparative genomic analysis of Pseudoperonospora cubensis

Ecology and Evolution, 7(16), 6231–6246.

By: A. Thomas n, I. Carbone n, K. Choe n, L. Quesada-Ocampo n & P. Ojiambo n

author keywords: coalescent analysis; cucurbits; disease resurgence; downy mildew; lineage; phylogenetic analysis
TL;DR: P. cubensis is associated with the resurgence of CDM on cucumber in the United States and its presence in two distinct evolutionary lineages (lineages I and II) is confirmed. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: ORCID, Crossref, NC State University Libraries, Web Of Science
Added: August 6, 2018

2017 journal article

Revisiting Graduate Student Training to Address Agricultural and Environmental Societal Challenges

Agricultural & Environmental Letters, 2(1), 170019.

By: O. Duckworth n, M. Andrews n, M. Cubeta n, A. Grunden n & P. Ojiambo n

UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries, Crossref
Added: August 6, 2018

2017 journal article

Virulence Structure Within Populations of Pseudoperonospora cubensis in the United States

PHYTOPATHOLOGY, 107(6), 777–785.

By: A. Thomas n, I. Carbone n, A. Lebeda n & P. Ojiambo n

MeSH headings : Cucumis sativus / parasitology; Genotype; Host Specificity; Oomycetes / pathogenicity; Phenotype; Plant Diseases / parasitology; United States; Virulence / genetics
TL;DR: The diverse virulence and high virulence complexity within the pathogen population indicate that host resistance alone in available cucurbit cultivars will not be effective to control CDM. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2016 journal article

Environmental distribution and genetic diversity of vegetative compatibility groups determine biocontrol strategies to mitigate aflatoxin contamination of maize by Aspergillus flavus

MICROBIAL BIOTECHNOLOGY, 9(1), 75–88.

By: J. Atehnkeng*, M. Donner*, P. Ojiambo n, B. Ikotun*, J. Augusto*, P. Cotty*, R. Bandyopadhyay*

MeSH headings : Aflatoxins / analysis; Aflatoxins / metabolism; Aspergillus flavus / genetics; Aspergillus flavus / growth & development; Aspergillus flavus / isolation & purification; Aspergillus flavus / metabolism; Genetic Variation; Zea mays / microbiology
TL;DR: Wide distributed VCGs in Nigeria such as AV0222, AV3279, AV 3304 and AV16127 can be deployed for a region‐wide biocontrol of toxigenic isolates to reduce aflatoxin contamination in maize. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2016 journal article

Predicting Pre-planting Risk of Stagonospora nodorum blotch in Winter Wheat Using Machine Learning Models

Frontiers in Plant Science, 7.

By: L. Mehra n, C. Cowger n, K. Gross n & P. Ojiambo n

author keywords: disease risk; machine learning; random forest; variable importance; Stagonospora nodorum blotch; wheat
TL;DR: A strong relationship was observed between late-season severity of SNB and specific pre-planting factors in which latitude, longitude, wheat residue, and cultivar resistance were the most important predictors. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
Source: ORCID
Added: December 19, 2019

2016 journal article

Using Next-Generation Sequencing to Develop Molecular Diagnostics for Pseudoperonospora cubensis, the Cucurbit Downy Mildew Pathogen

PHYTOPATHOLOGY, 106(10), 1105–1116.

MeSH headings : Cucurbitaceae / parasitology; Genetic Markers / genetics; Genomics; High-Throughput Nucleotide Sequencing / methods; Host Specificity; Oomycetes / genetics; Oomycetes / isolation & purification; Plant Diseases / parasitology; Plant Leaves / parasitology; Real-Time Polymerase Chain Reaction; Sequence Analysis, DNA; Species Specificity
TL;DR: Seven diagnostic markers were found to be specific to P. cubensis that could be used for pathogen diagnostics on infected tissue, or adapted for monitoring airborne inoculum with real-time PCR and spore traps. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 review

Epidemiology and population biology of Pseudoperonospora cubensis: A model system for management of downy mildews

[Review of ]. Annual review of phytopathology, vol 53, 53, 223–246.

By: P. Ojiambo, D. Gent, L. Quesada-Ocampo, M. Hausbeck & G. Holmes

Source: NC State University Libraries
Added: August 6, 2018

2015 journal article

Epidemiology and population biology of Pseudoperonospora cubensis: a model system for management of downy mildews.

Annual Review of Phytopathology, 53(1), 223–246.

author keywords: Bayesian prediction; disease management; genomics; mating type; pathotype; risk assessment
MeSH headings : Crop Production; Cucurbitaceae / microbiology; Oomycetes / physiology; Plant Diseases / microbiology
TL;DR: Uncertainty remains regarding the role of locally produced inoculum in disease outbreaks, but evidence suggests multiple sources of primary inoculum could be important and concepts and approaches developed in this pathosystem can guide future efforts when responding to incursions of new or reemerging downy mildew pathogens. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: ORCID
Added: December 19, 2019

2015 journal article

Initial Inoculum and Spatial Dispersal of Colletotrichum gloeosporioides, the Causal Agent of Strawberry Anthracnose Crown Rot

PLANT DISEASE, 99(1), 80–86.

By: M. Rahman n, P. Ojiambo n & F. Louws n

TL;DR: Results indicated that Parthenocissus quinquefolia is a noncultivated host of C. gloeosporioides in North Carolina and may serve as an initial inoculum source for planting material and rogueing of infected plants within a 4-m radius of infection foci would reduce the risk of transferring infected runner plants from the nursery to the fruiting field. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Quantifying the Effects of Wheat Residue on Severity of Stagonospora nodorum Blotch and Yield in Winter Wheat

Phytopathology, 105(11), 1417–1426.

By: L. Mehra n, C. Cowger n, R. Weisz n & P. Ojiambo n

MeSH headings : Ascomycota / physiology; Biomass; Host-Pathogen Interactions; Plant Diseases; Triticum / microbiology; Weather
TL;DR: It is shown that when wheat residue was sparse, small additions to residue density produced greater increases in SNB than when residue was abundant, suggesting that the economic threshold for the disease may be higher than previously assumed and warrants review. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Sources: NC State University Libraries, ORCID, NC State University Libraries
Added: August 6, 2018

2015 journal article

Resurgence of Cucurbit Downy Mildew in the United States: A Watershed Event for Research and Extension

PLANT DISEASE, 99(4), 428–441.

TL;DR: In 2004, an outbreak of cucurbit downy mildew caused by the oomycete Pseudoperonospora cubensis resulted in an epidemic that stunned the cucumber industry in the eastern United States, raising several fundamental questions about the potential causes for the resurgence of the disease. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries, ORCID
Added: August 6, 2018

2015 journal article

Resurgence of Pseudoperonospora cubensis: The Causal Agent of Cucurbit Downy Mildew

PHYTOPATHOLOGY, 105(7), 998–1012.

By: Y. Cohen n, K. Langenberg n, T. Wehner n, P. Ojiambo n, M. Hausbeck n, L. Quesada-Ocampo n, A. Lebeda n, H. Sierotzki n, U. Gisi n

author keywords: disease outbreak; population changes
MeSH headings : Cucurbitaceae / genetics; Cucurbitaceae / microbiology; Drug Resistance, Microbial; Europe; Fungicides, Industrial; Host-Pathogen Interactions / genetics; Oomycetes / physiology; Pest Control; Plant Diseases; Plant Immunity / genetics; United States
TL;DR: The downy mildew pathogen, Pseudoperonospora cubensis, which infects plant species in the family Cucurbitaceae, has undergone major changes during the last decade and offers challenges to scientists in many research areas including pathogen biology, epidemiology and dispersal, population structure and population genetics, host preference, host-pathogen interactions and gene expression, genetic host plant resistance, inheritance of host and fungicide resistance, and chemical disease control. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2014 journal article

Field efficacy of a mixture of atoxigenic Aspergillus flavus Link: Fr vegetative compatibility groups in preventing aflatoxin contamination in maize (Zea mays L.)

BIOLOGICAL CONTROL, 72, 62–70.

By: J. Atehnkeng*, P. Ojiambo n, P. Cotty* & R. Bandyopadhyay*

author keywords: Native strains; Aspergillus section Flavi; Aspergillus parasiticus; Aspergillus tamarii; Nigeria
TL;DR: Application of the strain mixture resulted in reduced aflatoxin content and significantly increased the combined frequencies of the vegetative com- patibility groups (VCGs) of the applied strains recovered from the soil and grain. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2014 article

First Report of Pseudoperonospora cubensis Causing Downy Mildew on Momordica balsamina and M. charantia in North Carolina

Wallace, E., Adams, M., Ivors, K., Ojiambo, P. S., & Quesada-Ocampo, L. M. (2014, September). PLANT DISEASE, Vol. 98, pp. 1279–1279.

By: E. Wallace n, M. Adams n, K. Ivors n, P. Ojiambo n & L. Quesada-Ocampo n

TL;DR: To the authors' knowledge, this is the first report of P. cubensis infecting these Momordica spp. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2014 journal article

Use of Quantitative Traits to Assess Aggressiveness of Phakopsora pachyrhizi Isolates from Nigeria and the United States

PLANT DISEASE, 98(9), 1261–1266.

By: M. Twizeyimana n, P. Ojiambo n, R. Bandyopadhyay n & G. Hartman n

TL;DR: This is the first study that used a large number of isolates from two continents to assess aggressiveness of P. pachyrhizi using multiple traits in soybean genotypes with contrasting types of disease reaction. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Effects of Host Plant Resistance and Fungicides on Severity of Cucumber Downy Mildew

HortScience, 48(1), 53–59.

By: A. Call n, T. Wehner n, G. Holmes n & P. Ojiambo n

author keywords: Cucumis sativus; Pseudoperonospora cubensis; disease
TL;DR: Evaluating the disease severity and yield of four cucumber cultivars that differed in disease resistance and were treated with fungicide programs representing a range of efficacy levels concluded that, even as highly resistant cultivars are released, growers will need to continue a minimal fungicide program to achieve maximum yield. (via Semantic Scholar)
Sources: Web Of Science, NC State University Libraries, Crossref
Added: August 6, 2018

2013 journal article

Modeling Spatial Frailties in Survival Analysis of Cucurbit Downy Mildew Epidemics

PHYTOPATHOLOGY, 103(3), 216–227.

By: P. Ojiambo* & E. Kang

author keywords: Bayesian model; hierarchical spatial frailty model; spatial heterogeneity
MeSH headings : Bayes Theorem; Cluster Analysis; Crops, Agricultural / economics; Crops, Agricultural / parasitology; Cucurbitaceae / parasitology; Epidemics / statistics & numerical data; Models, Biological; Oomycetes / physiology; Plant Diseases / economics; Plant Diseases / parasitology; Plant Diseases / statistics & numerical data; Risk; Seasons; Spatio-Temporal Analysis; Survival Analysis; Time Factors; United States
TL;DR: Evaluation of alternative formulations of the spatial models demonstrated that a Bayesian hierarchical spatially structured frailty model best described time to disease outbreak and indicated that states in the mid-Atlantic region have high spatial frailties and a high risk of downy mildew outbreak. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Pathogenic variation of Mycosphaerella species infecting banana and plantain in Nigeria

PLANT PATHOLOGY, 62(2), 298–308.

By: M. Zandjanakou-Tachin*, P. Ojiambo n, I. Vroh-Bi*, A. Tenkouano*, Y. Gumedzoe* & R. Bandyopadhyay*

author keywords: aggressiveness; diversity; M; eumusae; M; fijiensis; Musa; pathotype composition
TL;DR: The current pathotype structure of Mycosphaerella in Nigeria is described and provided a useful resource that will facilitate screening of newly developed Musa genotypes for resistance against two important leaf spot diseases of banana and plantain. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2013 journal article

Relationship between disease severity and escape of Pseudoperonospora cubensis sporangia from a cucumber canopy during downy mildew epidemics

PLANT PATHOLOGY, 62(6), 1366–1377.

By: K. Neufeld n, S. Isard* & P. Ojiambo n

author keywords: aerobiology; cucurbits; disease forecasting; inoculum dispersal; source strength
TL;DR: Results indicate that disease severity should be used to adjust sporangia escape in spore transport simulation models that are used to predict the risk of spread of cucurbit downy mildew. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, NC State University Libraries
Added: August 6, 2018

2012 journal article

Interactive Effects of Temperature and Leaf Wetness Duration on Sporangia Germination and Infection of Cucurbit Hosts by Pseudoperonospora cubensis

Plant Disease, 96(3), 345–353.

By: K. Neufeld n & P. Ojiambo n

TL;DR: Temperature and wetness duration that supported a given level of germination or infection varied among host types, and the effect of host type on germination and infection was characterized primarily by differences in the upper limit parameter in response to temperature. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2012 journal article

Novel Necrotrophic Effectors from Stagonospora nodorum and Corresponding Host Sensitivities in Winter Wheat Germplasm in the Southeastern United States

PHYTOPATHOLOGY, 102(5), 498–505.

By: A. Crook n, T. Friesen, Z. Liu, P. Ojiambo* & C. Cowger*

MeSH headings : Ascomycota / genetics; Ascomycota / metabolism; Chromosome Mapping; Cluster Analysis; Disease Susceptibility; Genes, Bacterial / genetics; Genes, Plant / genetics; Host-Pathogen Interactions; Mycotoxins / genetics; Mycotoxins / metabolism; Mycotoxins / pharmacology; Plant Diseases / microbiology; Plant Leaves / microbiology; Random Allocation; Seeds / drug effects; Seeds / genetics; Seeds / microbiology; Southeastern United States; Triticum / drug effects; Triticum / genetics; Triticum / microbiology
TL;DR: It is suggested that NE sensitivities influence but may not be the only determinant of cultivar resistance to S. nodorum, and specific knowledge of NE and Snn gene frequencies in this region can be used by wheat breeding programs to improve SNB resistance. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Sources: ORCID, Web Of Science, NC State University Libraries
Added: August 6, 2018

2012 journal article

Optimization of Late Blight and Bacterial Wilt Management in Potato Production Systems in the Highland Tropics of Africa

By: M. Olanya, Z. He, R. Larkin, W. Honeycutt, R. Nyankanga, P. Ojiambo, B. Lemaga, R. Kakuhenzire, D. Fontem

Source: ORCID
Added: December 19, 2019

2012 journal article

Pathogenic variation of Mycosphaerella species infecting banana and plantain in Nigeria

Plant Pathology. http://www.scopus.com/inward/record.url?eid=2-s2.0-84863100338&partnerID=MN8TOARS

By: M. Zandjanakou-Tachin, P. Ojiambo, I. Vroh-Bi, A. Tenkouano, Y. Gumedzoe & R. Bandyopadhyay

Source: ORCID
Added: December 19, 2019

2011 journal article

A Degree-Day Model for the Latent Period of Stagonospora nodorum Blotch in Winter Wheat

PLANT DISEASE, 95(5), 561–567.

By: A. Zeatfoss, C. Cowger n & P. Ojiambo n

TL;DR: This study provides data that link disease progress with wheat growth, which facilitates accurate identification of thresholds for timing of fungicide applications and describes the relationship between increasing number of lesions with pycnidia and accumulated thermal time. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

A degree-day model for the latent period of Stagonospora nodorum blotch in winter wheat

Plant Disease, 95(5), 561–567. http://www.scopus.com/inward/record.url?eid=2-s2.0-79955396485&partnerID=MN8TOARS

By: A. Zearfoss, C. Cowger & P. Ojiambo

Source: ORCID
Added: December 19, 2019

2011 journal article

Aspergillus Colonization and Aflatoxin Contamination of Maize and Sesame Kernels in Two Agro-ecological Zones in Senegal

JOURNAL OF PHYTOPATHOLOGY, 159(4), 268–275.

By: P. Diedhiou*, R. Bandyopadhyay*, J. Atehnkeng* & P. Ojiambo n

author keywords: Aspergillus section Flavi; geographical distribution; West Africa
TL;DR: In both agro-ecological zones, and in all storage systems, aflatoxin contamination was lower in sesame than in maize, and only three species of Aspergillus section Flavi were observed, suggesting a low susceptibility to A. flavus. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Dynamics of Soybean Rust Epidemics in Sequential Plantings of Soybean Cultivars in Nigeria

PLANT DISEASE, 95(1), 43–50.

By: M. Twizeyimana*, P. Ojiambo n, G. Hartman* & R. Bandyopadhyay*

TL;DR: It is suggested that selection of planting date could be a useful cultural practice for reducing soybean rust, with severity being higher on soybean crops planted during the wet season than those planted in the dry season. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Dynamics of soybean rust epidemics in sequential plantings of soybean cultivars in Nigeria

Plant Disease, 95(1), 43–50. http://www.scopus.com/inward/record.url?eid=2-s2.0-79751512238&partnerID=MN8TOARS

By: M. Twizeyimana, P. Ojiambo, G. Hartmand & R. Bandyopadhyay

Source: ORCID
Added: December 19, 2019

2011 journal article

Genetic structure and diversity of Phakopsora pachyrhizi isolates from soyabean

PLANT PATHOLOGY, 60(4), 719–729.

By: M. Twizeyimana*, P. Ojiambo n, J. Haudenshield*, G. Caetano-Anolles*, K. Pedley*, R. Bandyopadhyay*, G. Hartman n

author keywords: Glycine max; population biology; soyabean; soyabean rust; SSR genotype; virulence phenotype
TL;DR: A high degree of genetic variation was observed within the sampled populations of P. pachyrhizi, and low population differentiation was indicated by the low FST values among populations, suggesting a wide dispersal of identical genotypes on a regional scale. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Spatiotemporal Spread of Cucurbit Downy Mildew in the Eastern United States

PHYTOPATHOLOGY, 101(4), 451–461.

By: P. Ojiambo n & G. Holmes n

author keywords: spatial point pattern analysis; space-time clustering
MeSH headings : Cucurbitaceae / microbiology; Disease Outbreaks / statistics & numerical data; Geography; Oomycetes / pathogenicity; Plant Diseases / microbiology; Plant Diseases / statistics & numerical data; Seasons; Space-Time Clustering; Sporangia; Time Factors; United States
TL;DR: The hypothesis that infection of cucurbits by P. cubensis appears to be an outcome of a contagion process, and the relative large space-time window suggests that factors occurring on a large spatial scale facilitate the spread of cucurbit downy mildew in the eastern United States, is supported. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2011 journal article

Validation of tuber blight (Phytophthora infestans) prediction model

CROP PROTECTION, 30(5), 547–553.

By: R. Nyankanga*, O. Olanya*, P. Ojiambo n, H. Wien*, C. Honeycutt* & W. Kirk*

author keywords: Prediction model; Potato late blight; Solanum tuberosum; Tuber infection
TL;DR: Although inoculum availability is assumed in the model, incorporation of relationships of inoculum density, propagule survival in soil, and tuber blight incidence would greatly improve the prediction of tuber blight under field conditions. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

A Quantitative Review of Fungicide Efficacy for Managing Downy Mildew in Cucurbits

PHYTOPATHOLOGY, 100(10), 1066–1076.

By: P. Ojiambo n, P. Paul & G. Holmes

author keywords: fixed- and random-effects models; Pseudoperonospora cubensis
MeSH headings : Cucurbita / microbiology; Fungi / drug effects; Fungicides, Industrial / pharmacology; Plant Diseases / microbiology
TL;DR: The pyridinylmethyl-benzamide group of fungicides (fluopicolide) was the most effective, followed by the carbamate (propamocarb) and quinone inside inhibitors (cyazofamid) group of fungusicides, while the carboxylic acid amide group (mandipropamid and dimethomorph)was the least effective. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Efficiency of Adaptive Cluster Sampling for Estimating Plant Disease Incidence

PHYTOPATHOLOGY, 100(7), 663–670.

By: P. Ojiambo n & H. Scherm

author keywords: disease survey; survey efficiency
MeSH headings : Cluster Analysis; Computer Simulation; Incidence; Plant Diseases; Sample Size
TL;DR: Both precision and the sample size required with adaptive cluster sampling responded similarly to disease incidence and aggregation, i.e., both were most favorable at the lowest disease incidence with the highest levels of clustering. (via Semantic Scholar)
UN Sustainable Development Goal Categories
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Quantitative Models for Germination and Infection of Pseudoperonospora cubensis in Response to Temperature and Duration of Leaf Wetness

PHYTOPATHOLOGY, 100(9), 959–967.

By: L. Arauz*, K. Neufeld*, A. Lloyd* & P. Ojiambo*

author keywords: cucurbit downy mildew; disease forecasting
MeSH headings : Cucumis melo / microbiology; Oomycetes / physiology; Plant Diseases / microbiology; Spores / physiology; Temperature; Time Factors; Water
TL;DR: Three response surface models based on modified forms of the Weibull function were evaluated for their ability to describe germination of sporangia and infection in response to temperature and leaf wetness duration and were used to construct risk threshold charts that can be used to estimate the potential risk for infection based on observed or forecasted temperature and Leaf Wetness duration. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2010 journal article

Survival of Pseudoperonospora cubensis sporangia exposed to solar radiation

PLANT PATHOLOGY, 59(2), 313–323.

By: L. Kanetis n, G. Holmes* & P. Ojiambo n

author keywords: aerobiology; cucurbits; downy mildew; spore dispersal
TL;DR: Disease severity data from inoculation experiments using sporangia exposed to varying amounts of cumulative solar radiation doses corroborated the results of the solar radiation experiments. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2009 journal article

Identification and genetic diversity of Mycosphaerella species on banana and plantain in Nigeria

PLANT PATHOLOGY, 58(3), 536–546.

By: M. Zandjanakou-Tachin*, I. Vroh-Bi*, P. Ojiambo n, A. Tenkouano*, Y. Gumedzoe* & R. Bandyopadhyay*

author keywords: black Sigatoka; genetic population structure; Musa species; ribosomal RNA genes; sequence haplotypes
TL;DR: The results indicate that M. musicola has been replaced by more frequently occurring M. fijiensis and M. eumusae, against which disease management and resistance breeding efforts should be directed in Nigeria. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
13. Climate Action (Web of Science)
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2009 journal article

Pathogenic Variation of Phakopsora pachyrhizi Infecting Soybean in Nigeria

PHYTOPATHOLOGY, 99(4), 353–361.

By: M. Twizeyimana*, P. Ojiambo*, K. Sonder, T. Ikotun, G. Hartman & R. Bandyopadhyay

author keywords: pathogen diversity; pathotype composition; virulence analysis; West Africa
MeSH headings : Basidiomycota / genetics; Basidiomycota / pathogenicity; Cluster Analysis; Genetic Variation; Genotype; Geography; Host-Pathogen Interactions; Nigeria; Plant Diseases; Soybeans / microbiology
TL;DR: This work will be useful in breeding and management of soybean rust by facilitating identification of resistant genotypes and targeting cultivars with specific resistance to match prevailing P. pachyrhizi pathotypes in a given geographical zone. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science)
3. Good Health and Well-being (OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2009 journal article

Permanent Genetic Resources added to Molecular Ecology Resources Database 1 May 2009-31 July 2009

MOLECULAR ECOLOGY RESOURCES, 9(6), 1460–1466.

By: G. Almany*, M. De Arruda, W. Arthofer*, Z. Atallah*, S. Beissinger*, M. Berumen*, S. Bogdanowicz*, S. Brown* ...

TL;DR: This article documents the addition of 512 microsatellite marker loci and nine pairs of Single Nucleotide Polymorphism (SNP) sequencing primers to the Molecular Ecology Resources Database. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (Web of Science; OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2009 journal article

Permanent genetic resources added to molecular ecology resources database 1 May 2009-31 July 2009

Molecular Ecology Resources, 9(6), 1460–1466. http://www.scopus.com/inward/record.url?eid=2-s2.0-70349920666&partnerID=MN8TOARS

By: G. Almany, M. De Arruda, W. Arthofer, Z. Atallah, S. Beissinger, M. Berumen, S. Bogdanowicz, S. Brown ...

Source: ORCID
Added: December 19, 2019

2009 review

Recent developments in managing tuber blight of potato (Solanum tuberosum) caused by Phytophthora infestans

[Review of ]. CANADIAN JOURNAL OF PLANT PATHOLOGY, 31(3), 280–289.

By: O. Olanya*, P. Ojiambo n, R. Nyankanga*, C. Honeycutt* & W. Kirk*

author keywords: late blight; disease control; tuber rot
TL;DR: The application of molecular genetic tools in potato breeding to identify novel sources of resistance, effective control of the disease using host resistance is more likely, and the evaluation of biocontrol agents or alternative approaches for control of tuber blight may lead to effective management of this disease. (via Semantic Scholar)
Source: Web Of Science
Added: August 6, 2018

2009 journal article

Recent developments in managing tuber blight of potato (Solanum tuberosum) caused by Phytophthora infestans

Canadian Journal of Plant Pathology, 31(3), 280–289. http://www.scopus.com/inward/record.url?eid=2-s2.0-77955871444&partnerID=MN8TOARS

By: O. Olanya, P. Ojiambo, R. Nyankanga, C. Honeycutt & W. Kirk

Source: ORCID
Added: December 19, 2019

2009 journal article

Resistance of F1 segregating populations derived from crosses between wild banana accessions musa acuminata spp. burmannicoides 'calcutta 4' and m. balbisiana 'montpellier' to black leaf streak disease

Acta Horticulturae, 828, 353–358. http://www.scopus.com/inward/record.url?eid=2-s2.0-70350093172&partnerID=MN8TOARS

By: I. Vroh-Bi, M. Zandjanakou-Tachin, M&apos, W. bah, A. Tenkouano, P. Ojiambo, R. Bandyopadhyay

Source: ORCID
Added: December 19, 2019

2008 journal article

Development of tuber blight (Phytophthora infestans) on potato cultivars based on in vitro assays and field evaluations

HORTSCIENCE, 43(5), 1501–1508.

By: R. Nyankanga n, O. Olanya, H. Wien, R. El-Bedewy n, J. Karinga n & P. OJiambo n

author keywords: Phytophthora infestans; US-1 genotype; Solanum tuberosum; R-genes; tuber blight; tuber blight prediction
TL;DR: Although tuber infection differed among cultivars, the frequency of blighted tubers had a normal statistical distribution irrespective of R-genes, implying that foliar resistance may have limited effect on tuber blight occurrence based on in vitro experiments. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2008 journal article

Distribution and toxigenicity of Aspergillus species isolated from maize kernels from three agro-ecological zones in Nigeria

International Journal of Food Microbiology, 122(1-2), 74–84. http://www.scopus.com/inward/record.url?eid=2-s2.0-39149087032&partnerID=MN8TOARS

By: J. Atehnkeng, P. Ojiambo, M. Donner, T. Ikotun, R. Sikora, P. Cotty, R. Bandyopadhyay

Source: ORCID
Added: December 19, 2019

2008 journal article

Evaluation of atoxigenic isolates of Aspergillus flavus as potential biocontrol agents for aflatoxin in maize

FOOD ADDITIVES AND CONTAMINANTS PART A-CHEMISTRY ANALYSIS CONTROL EXPOSURE & RISK ASSESSMENT, 25(10), 1264–1271.

By: J. Atehnkeng*, P. Ojiambo n, T. Ikotun*, R. Sikora*, P. Cotty* & R. Bandyopadhyay*

author keywords: aflatoxin; corn; mycotoxin; competitive exclusion; West Africa
MeSH headings : Aflatoxin B1 / analysis; Aflatoxin B1 / antagonists & inhibitors; Aflatoxins / analysis; Aflatoxins / antagonists & inhibitors; Aspergillus flavus / chemistry; Crops, Agricultural; Ecology / methods; Food Microbiology; Nigeria; Pest Control, Biological; Spores; Zea mays / chemistry; Zea mays / microbiology
TL;DR: Among the naturally occurring atoxigenic isolates in Nigeria, two isolates from Lafia, La3279 and La3303, were most effective at reducing aflatoxin B1 + B2 concentrations in both laboratory and field trials. (via Semantic Scholar)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2008 journal article

Evaluation of soybean germplasm for resistance to soybean rust (Phakopsora pachyrhizi) in Nigeria

PLANT DISEASE, 92(6), 947–952.

By: M. Twizeyimana*, P. Ojiambo n, T. Ikotun*, J. Ladipo*, G. Hartman* & R. Bandyopadhyay*

author keywords: disease resistance; stability analysis
TL;DR: Results indicate that some of the breeding lines (TGx 1835-10E, TGx 1895-50F, and TGx 1903-3F) and accessions would be useful sources of soybean rust resistance genes for incorporation into high-yielding and adapted cultivars. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (Web of Science; OpenAlex)
13. Climate Action (Web of Science)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2008 journal article

Novel sources of resistance to Fusarium stalk rot of maize in tropical Africa

PLANT DISEASE, 92(5), 772–780.

By: C. Afolabi*, P. Ojiambo n, E. Ekpo*, A. Menkir & R. Bandyopadhyay

TL;DR: Four inbred lines evaluated in field trials at Ikenne and Ibadan, Nigeria in 2003 and 2004 to identify new sources of resistance to stalk rot caused by Fusarium verticillioides have been identified to have high levels of disease resistance. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, ORCID, NC State University Libraries
Added: August 6, 2018

2007 journal article

Comparison of field, greenhouse, and detached-leaf evaluations of soybean germplasm for resistance to Phakopsora pachyrhizi

Plant Disease, 91(9), 1161–1169. http://www.scopus.com/inward/record.url?eid=2-s2.0-34548220000&partnerID=MN8TOARS

By: M. Twizeyimana, P. Ojiambo, T. Ikotun, C. Paul, G. Hartman & R. Bandyopadhyay

Source: ORCID
Added: December 19, 2019

2007 journal article

Distribution and toxigenicity of Aspergillus species isolated from maize kernels from three agro-ecological zones in Nigeria.

International Journal of Food Microbiology, 2.

By: J. Atehnkeng*, P. Ojiambo, M. Donner, T. Ikotun, R. Sikora, P. Cotty, R. Bandyopadhyay

author keywords: aflatoxin; Aspergillus section Flavi; geographical distribution; West Africa
MeSH headings : Aflatoxins / biosynthesis; Aspergillus / growth & development; Aspergillus / isolation & purification; Aspergillus / metabolism; Aspergillus flavus / growth & development; Aspergillus flavus / isolation & purification; Aspergillus flavus / metabolism; Consumer Product Safety; Demography; Food Contamination / analysis; Food Microbiology; Humans; Nigeria; Zea mays / chemistry; Zea mays / microbiology
TL;DR: Maize samples were collected during a survey in three agro-ecological zones in Nigeria to determine the distribution and aflatoxin-producing potential of members of Aspergillus section Flavi to find the most predominant fungal genera identified. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2007 journal article

Erratum: Evaluation of maize inbred lines for resistance to fusarium ear rot and fumonisin accumulation in grain in tropical Africa (Plant Disease (2007) 91 (3) (279-286))

Plant Disease, 91(5). http://www.scopus.com/inward/record.url?eid=2-s2.0-34247499048&partnerID=MN8TOARS

By: C. Afolabi, P. Ojiambo, E. Ekpo, A. Menkir & R. Bandyopadhyay

Source: ORCID
Added: December 19, 2019

2007 journal article

Evaluation of Maize Inbred Lines for Resistance to Fusarium Ear Rot and Fumonisin Accumulation in Grain in Tropical Africa

Plant Disease, 3(3), 279–286.

By: C. Afolabi*, P. Ojiambo*, E. Ekpo*, A. Menkir* & R. Bandyopadhyay*

author keywords: corn; mycotoxin
TL;DR: Five inbred lines that had consistently low disease severity are useful for breeding programs to develop fumonisin resistant lines. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2007 journal article

First Report of Rust Caused by Phakopsora pachyrhizi on Soybean in Democratic Republic of Congo.

Plant Disease, 9.

By: P. Ojiambo*, R. Bandyopadhyay*, M. Twizeyimana*, A. Lema, R. Frederick*, K. Pedley*, C. Stone*, G. Hartman*

TL;DR: The PCR assay, morphological characters of the isolates, and pathogenicity tests demonstrate that P. pachyrhizi occurs in DRC, and it is confirmed that soybean rust caused by Phakopsora pachyrsizi is present in the country. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2007 journal article

First Report of Soybean Rust Caused by Phakopsora pachyrhizi in Ghana.

Plant Disease, 8.

By: R. Bandyopadhyay*, P. Ojiambo*, M. Twizeyimana*, B. Asafo-Adjei, R. Frederick*, K. Pedley*, C. Stone*, G. Hartman*

TL;DR: The PCR assay, alignment of ITS region 2, morphological characters of the isolates, and pathogenicity tests demonstrate that P. pachyrhizi occurs in Ghana, to the authors' knowledge, this is the first report of P. PachyrHizi in Ghana. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2007 journal article

Rapid Screening of Musa Species for Resistance to Black Leaf Streak Using In Vitro Plantlets in Tubes and Detached Leaves

Plant Disease, 3(3), 308–314.

By: M. Twizeyimana*, P. Ojiambo*, A. Tenkouano*, T. Ikotun* & R. Bandyopadhyay*

author keywords: banana; black Sigatoka; plantain
TL;DR: Results show that these two assays are rapid and space-effective, and can reliably be used for screening Musa genotypes for resistance to black leaf streak. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2007 journal article

Relationship between late blight [Phytophthora infestans] of potato on tuber and foliage, as affected by the disease severity on foliage, cultivar resistance, and atmospheric and soil variables

Canadian Journal of Plant Pathology, 29(4), 372–387.

By: R. Nyankanga, H. Wien, O. Olanya & P. Ojiambo*

TL;DR: It is suggested that cultivar resistance, soil variables, and atmospheric variables are the main determinants of foliar and tuber blight infection when inoculum is present. (via Semantic Scholar)
Sources: Crossref, ORCID
Added: December 19, 2019

2007 journal article

Temporal Dynamics of Septoria Leaf Spot of Blueberry and its Relationship to Defoliation and Yield

Plant Health Progress, 8(1), 68.

By: P. Ojiambo*, H. Scherm* & P. Brannen*

Source: ORCID
Added: December 19, 2019

2007 journal article

Temporal Dynamics of Septoria Leaf Spot of Blueberry and its Relationship to Defoliation and Yield

By: P. Ojiambo

Source: ORCID
Added: December 19, 2019

2006 journal article

Biological and application-oriented factors influencing plant disease suppression by biological control: a meta-analytical review.

Phytopathology, 11(11), 1168–1174.

By: P. Ojiambo* & H. Scherm

TL;DR: Interestingly, effect sizes for entries that used Bacillus spp. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2006 journal article

Dynamics of development of late blight [Phytophthora infestans] in potato, and comparative resistance of cultivars in the highland tropics.

Canadian Journal of Plant Pathology. Revue Canadienne De Phytopathologie, 1.

By: O. Olanya*, P. Ojiambo* & R. Nyankanga*

author keywords: infection rates; Phytophthora infestans; population A; population B; resistance; potato; highland tropics; Kenya
TL;DR: Host resistance is an important component for the management of late blight on potato, in the highland tropics, where effective fungicide use is limited because of the cost of application and where late blight is a recurring problem. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2006 journal article

Optimum Sample Size for Determining Disease Severity and Defoliation Associated with Septoria Leaf Spot of Blueberry

Plant Disease, 90(9), 1209–1213.

By: P. Ojiambo* & H. Scherm*

author keywords: disease assessment; sampling; Vaccinium virgatum
TL;DR: Given the strong correlation between the two disease variables demonstrated in this study, visual assessment of percent necrotic area was the more efficient method for assessing defoliation across the 3 years. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2006 journal article

Septoria Leaf Spot Reduces Flower Bud Set and Yield Potential of Rabbiteye and Southern Highbush Blueberries

Plant Disease, 90(1), 51–57.

By: P. Ojiambo*, H. Scherm* & P. Brannen*

author keywords: Septoria albopunctata; Vaccinium ashei; V. corymbosum
TL;DR: In field trials on Premier rabbiteye blueberry, individual shoots were selected and tagged in the fall of 2001, 2002, and 2003 to quantify the effects of Septoria leaf spot severity and disease-induced premature defoliation on flower bud set and return yield, and relationships between yield and disease variables were similar to those of flower bud numbers and disease. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2006 journal article

Trends in Theoretical Plant Epidemiology

European Journal of Plant Pathology., 5(1), 61–73.

By: H. Scherm*, H. Ngugi* & P. Ojiambo*

author keywords: decision analysis; mathematical model; population genetics; spatial structure; statistical epidemiology; stochasticity
TL;DR: Trends and advances in three specific areas of theoretical plant epidemiology are reviewed: models of temporal and spatial dynamics of disease, the synergism of epidemiology and population genetics, and progress in statistical epidemiology. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: ORCID
Added: December 19, 2019

2005 journal article

Survival Analysis of Time to Abscission of Blueberry Leaves Affected by Septoria Leaf Spot

Phytopathology, 95(1), 108–113.

By: P. Ojiambo* & H. Scherm

TL;DR: In the southeastern United States, Septoria leaf spot, caused by Septoria albopunctata, can result in premature defoliation of blueberry plants during summer and fall, thereby reducing yield potential for the following year. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2005 journal article

Temporal Progress of Septoria Leaf Spot on Rabbiteye Blueberry (Vaccinium ashei)

Plant Disease, 89(10), 1090–1096.

By: P. Ojiambo* & H. Scherm*

TL;DR: The results of this study indicate that inoculum of S. albopunctata is present throughout most of the growing season and that infection can occur season-long on leaves of any age, giving rise to a polycyclic epidemic. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: ORCID
Added: December 19, 2019

2004 journal article

Applications of Survival Analysis in Botanical Epidemiology

Phytopathology, 94(9), 1022–1026.

By: H. Scherm & P. Ojiambo*

author keywords: rabbiteye blueberry; Vaccinium ashei; Weibull distribution
TL;DR: Analysis with the accelerated failure time model revealed a significantly (P < 0.0001) increased defoliation risk due to Septoria leaf spot, caused by Septoria albopunctata. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: ORCID
Added: December 19, 2019

2004 journal article

Farmers' cultural practices and management of potato late blight in Kenya highlands: Implications for development of integrated disease management

International Journal of Pest Management, 50(2), 135–144. http://www.scopus.com/inward/record.url?eid=2-s2.0-2542427836&partnerID=MN8TOARS

By: R. Nyankanga, H. Wien, O. Olanya & P. Ojiambo

Source: ORCID
Added: December 19, 2019

2003 journal article

Field transmission efficiency of Alternaria sesami in sesame from infected seed

Crop Protection, 22(9), 1107–1115.

By: P. Ojiambo*, R. Mibey*, R. Narla* & P. Ayiecho*

author keywords: Alternaria leaf spot; epidemiology; seed infection; seed transmission efficiency; sesame; temporal progress
TL;DR: Four sesame accessions with varying levels of susceptibility to Alternaria sesami were selected from an advanced germplasm collection of the Sesame Improvement Project to determine transmission efficiency of A. sesamy from seed under field conditions. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

2000 journal article

Comparing different epidemiological models in field evaluations of selected genotypes from Solanum tuberosum CIP population A for resistance to Phytophthora infestans (Mont.) De Bary in Kenya

EUPHYTICA, 111(3), 211–218.

By: P. Ojiambo*, J. Nyanapah n, C. Lung'aho, J. Karinga* & H. Kidanemariam*

author keywords: epidemiology; horizontal resistance; lateblight; Solanum tuberosum
TL;DR: AUDPCs revealed more distinct differences among the genotypes than any other disease assessment parameter, and Frequency distribution of AUDPCs among genotypes appeared continuous and did not differ significantly from normal distribution suggesting the observed resistance may be attributable to minor genes. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Sources: ORCID, Web Of Science
Added: August 6, 2018

2000 journal article

Host adaptation to potato and tomato within the US-1 clonal lineage of Phytophthora infestans in Uganda and Kenya.

Plant Pathology., 10(5), 531–539.

By: M. Vega-Sanchez, L. Erselius, A. Rodriguez, O. Bastidas, . Hohl, P. Ojiambo*, J. Mukalazi*, T. Vermeulen*, W. Fry*, G. Forbes

author keywords: adaptation; lineages; Phytophthora infestans; populations; potato; tomato
TL;DR: Assessment of Gpi banding patterns, mtDNA haplotype and RFLP fingerprint of 39 isolates from potato collected in Uganda and Kenya in 1997 indicated that the population had not changed on this host, indicating that host adaptation is not determined by an ability to cause disease but rather by quantitative differences in pathogenic fitness. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Source: ORCID
Added: December 19, 2019

2000 journal article

Infection of sesame seed by Alternaria sesami (Kawamura) Mohanty and Behera and severity of Alternaria leaf spot in Kenya

International Journal of Pest Management, 46(2), 121–124. http://www.scopus.com/inward/record.url?eid=2-s2.0-0034035753&partnerID=MN8TOARS

By: P. Ojiambo, R. Narla, P. Ayiecho & R. Mibey

Source: ORCID
Added: December 19, 2019

2000 journal article

Tolerance level of Alternaria sesami and the effect of seed infection on yield of sesame in Kenya.

Experimental Agriculture., 7(3), 335–342.

By: P. Ojiambo*, P. Ayiecho*, R. Narla* & R. Mibey*

TL;DR: Disease severity increased with increase in seed infection and was least and most severe in plots established with seeds with 0 and 8% infection levels respectively, which fitted the Gompertz model more closely than the logistic model. (via Semantic Scholar)
Source: ORCID
Added: December 19, 2019

1999 journal article

Severity of Alternaria leaf spot and seed infection by Alternaria sesami (Kawamura) Mohanty and Behera, as affected by plant age of sesame (Sesamum indicum L.)

Journal of Phytopathology, 147(7-8), 403–407. http://www.scopus.com/inward/record.url?eid=2-s2.0-0032848347&partnerID=MN8TOARS

By: P. Ojiambo, P. Ayiecho & J. Nyabundi

Source: ORCID
Added: December 19, 2019

1998 journal article

Yield stability analysis of promising potato clones in mid and high altitude regions of Kenya

African Crop Science Journal, 6(2).

By: C. Lung'aho, P. Ojiambo* & H. Kidanemariam

UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Source: ORCID
Added: December 19, 2019

article

Trends in theoretical plant epidemiology

Scherm, H., Ngugi, H. K., & Ojiambo, P. S. Plant Disease Epidemiology: Facing Challenges of the 21st Century, pp. 61–73.

By: H. Scherm*, H. Ngugi* & P. Ojiambo*

UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: ORCID
Added: December 19, 2019

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