Gregory R. Parra

Works (7)

Updated: July 5th, 2023 16:04

2001 journal article

PCR amplification of the Irish potato famine pathogen from historic specimens

NATURE, 411(6838), 695–697.

By: J. Ristaino n , C. Groves n & G. Parra n

Contributors: J. Ristaino n , C. Groves n & G. Parra n

MeSH headings : Base Sequence; Biological Specimen Banks; DNA, Mitochondrial; DNA, Ribosomal; History, 19th Century; History, 20th Century; Humans; Ireland; Molecular Sequence Data; Phytophthora / genetics; Plant Diseases / history; Plant Diseases / microbiology; Polymerase Chain Reaction; Sequence Analysis, DNA; Solanum tuberosum / microbiology; Starvation / history
TL;DR: The amplification and sequencing of 100-base-pair fragments of DNA from the internal transcribed spacer region 2 from 28 historic herbarium samples are described, confirming the identity of the pathogen P. infestans and emphasizing the importance of using historic specimens when making inferences about historic populations. (via Semantic Scholar)
UN Sustainable Development Goal Categories
2. Zero Hunger (OpenAlex)
Sources: Web Of Science, ORCID
Added: August 6, 2018

2001 journal article

Resistance to mefenoxam and metalaxyl among field isolates of Phytophthora capsici causing Phytophthora blight of bell pepper

PLANT DISEASE, 85(10), 1069–1075.

By: G. Parra n & J. Ristaino n 

author keywords: epidemiology; fungicide resistance; fungicide sensitivity; Phytophthora root and crown rot
TL;DR: Field isolates of Phytophthora capsici resistant to mefenoxam on pepper have not been reported previously and now pose new challenges for management of this important disease. (via Semantic Scholar)
UN Sustainable Development Goal Categories
15. Life on Land (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

2000 journal article

Temporal dynamics of Phytophthora blight on bell pepper in relation to the mechanisms of dispersal of primary inoculum of Phytophthora capsici in soil

PHYTOPATHOLOGY, 90(2), 148–156.

By: L. Sujkowski*, G. Parra*, M. Gumpertz* & J. Ristaino* 

author keywords: root disease; spatial dynamics
TL;DR: The data from both field and growth-chamber studies demonstrate that the mechanism of dispersal of the primary inoculum in soil can have large effects on the temporal dynamics of disease. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

1998 journal article

Insensitivity to Ridomil Gold (Mefenoxam) found among field isolates of phytophthora capsici causing phytophthora blight on bell pepper in North Carolina and New Jersey

Plant Disease, 82(6), 711.

By: G. Parra n & J. Ristaino n 

TL;DR: A dramatic shift in populations of P. capsici to insensitivity to the new metalaxyl substitute mefenoxam has occurred in bell pepper fields in a 3-year period. (via Semantic Scholar)
Sources: NC State University Libraries, ORCID
Added: August 6, 2018

1998 journal article

PCR amplification of ribosomal DNA for species identification in the plant pathogen genus Phytophthora

Applied and Environmental Microbiology, 64(3), 948–954.

By: J. Ristaino , M. Madritch, C. Trout & G. Parra

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

1997 conference paper

Effect of inoculum source type and cultural practices on the spread of Phytophthora capsici in bell pepper

In J. E. D. V. J. J. Stapleton & C. L. Elmore (Eds.), Soil solarization and integrated management of soilborne pests: Proceedings of the Second International Conference on Soil Solarization and Integrated Management of Soilborne Pests, Aleppo, Syrian Arab Republic, 16-21 March 1997. Rome: Food and Agriculture Organization of the United.

By: J. Ristaino , G. Parra & C. Campbell

Ed(s): J. J. J. Stapleton & C. Elmore

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

1997 journal article

Suppression of Phytophthora blight in bell pepper by a no-till wheat cover crop

PHYTOPATHOLOGY, 87(3), 242–249.

By: J. Ristaino* , G. Parra* & C. Campbell*

author keywords: epidemiology; sustainable agriculture
TL;DR: Four mechanisms of dispersal of propagules of Phytophthora capsici were investigated through modifications in cultural practices and fungicide applications in field plots of bell pepper, and pathogen dispersal mechanisms were modified most dramatically by the no-till cropping system. (via Semantic Scholar)
UN Sustainable Development Goal Categories
3. Good Health and Well-being (OpenAlex)
Source: Web Of Science
Added: August 6, 2018

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