@article{rivard_s. o'connell_peet_welker_louws_2012, title={Grafting Tomato to Manage Bacterial Wilt Caused by Ralstonia solanacearum in the Southeastern United States}, volume={96}, ISSN={["1943-7692"]}, DOI={10.1094/pdis-12-10-0877}, abstractNote={ Bacterial wilt, caused by Ralstonia solanacearum, can result in severe losses to tomato (Solanum lycopersicum) growers in the southeastern United States, and grafting with resistant rootstocks may be an effective strategy for managing this disease. However, R. solanacearum populations maintain considerable diversity, and little information is known regarding the efficacy of commercially available rootstocks to reduce bacterial wilt incidence and subsequent crop loss in the United States. In this study, tomato plants grafted onto ‘Dai Honmei’ and ‘RST-04-105-T’ rootstocks had significantly lower area under the disease progress curve (AUDPC) values compared with nongrafted plants (P < 0.05). Across three locations in North Carolina, final bacterial wilt incidence for non- and self-grafted plants was 82 ± 14 to 100%. In contrast, bacterial wilt incidence for the grafted plants was 0 to 65 ± 21%. Final bacterial wilt incidence of plants grafted with Dai Honmei rootstock was 0 and 13 ± 3% at two locations in western North Carolina but 50 ± 3% at a third site in eastern North Carolina. Similarly, grafting onto RST-04-105-T rootstock significantly reduced AUDPC values at two of the three locations (P < 0.05) compared with that of the nongrafted plants, but performed poorly at the third site. Total fruit yields were significantly increased by grafting onto resistant rootstocks at all three sites (P < 0.05). Regression analyses indicated that yield was significantly negatively correlated with bacterial wilt AUDPC values (R2 was 0.4048 to 0.8034), and the use of resistant rootstocks enabled economically viable tomato production in soils naturally infested with R. solanacearum. }, number={7}, journal={PLANT DISEASE}, publisher={Scientific Societies}, author={Rivard, C. L. and S. O'Connell and Peet, M. M. and Welker, R. M. and Louws, F. J.}, year={2012}, month={Jul}, pages={973–978} }
 @article{o'connell_rivard_peet_harlow_louws_2012, title={High Tunnel and Field Production of Organic Heirloom Tomatoes: Yield, Fruit Quality, Disease, and Microclimate}, volume={47}, ISSN={["2327-9834"]}, DOI={10.21273/hortsci.47.9.1283}, abstractNote={Organic and heirloom tomatoes are high-value products with growing demand but there are many challenges to successful cultivation. A systems comparison study was carried out to evaluate the production of the popular heirloom tomato ‘Cherokee Purple’ (Solanum lycopersicum L.) under high tunnel and open field systems in North Carolina from 2007 to 2008. Management of the high tunnel (i.e., temperature and irrigation), weather events as well as pest and disease pressure influenced crop quality and yield. The high tunnel and field systems achieved similar total yields (100 t·ha−1) the first season but yields were 33% greater in the high tunnel system than the field system in the second year (100 t·ha−1 and 67 t·ha−1, respectively). Both years, the tomatoes were planted in high tunnels 1 month earlier and harvested 3 weeks earlier than the field. The accumulation of ≈1100 growing degree-days (GDD) was required in both systems before 50% of the fruit was harvested. Fruit cracking, cat-facing, blossom-end rot, and insect damage were the major categories of defects in both systems. Incidence of both Tomato Spotted Wilt Virus (TSWV) and Gray Leaf Spot (GLS) were lower in the high tunnel compared with the field in 2007 and 2008, respectively. Results of this study suggest that with proper management techniques, high tunnels can optimize yields, increase fruit quality, and provide season extension opportunities for high-value horticultural crops.}, number={9}, journal={HORTSCIENCE}, publisher={American Society for Horticultural Science}, author={O'Connell, Suzanne and Rivard, Cary and Peet, Mary M. and Harlow, Chris and Louws, Frank}, year={2012}, month={Sep}, pages={1283–1290} }
 @article{rivard_sydorovych_o'connell_peet_louws_2010, title={An Economic Analysis of Two Grafted Tomato Transplant Production Systems in the United States}, volume={20}, ISSN={["1943-7714"]}, DOI={10.21273/horttech.20.4.794}, abstractNote={The grafting of herbaceous vegetables is an emerging development in the United States. This report provides an estimate of the variable costs of grafting within U.S. tomato (Solanum lycopersicum) transplant production systems. Grafted and nongrafted plants were propagated at two commercial farming operations in Ivanhoe, NC (NC) and Strasburg, PA (PA) and the farm in NC produced certified organic transplants. Detailed economic production sequences were generated for each site, and grafted and nongrafted transplant production costs were $0.59 and $0.13 in NC, and $1.25 and $0.51 in PA, respectively. Direct costs associated with grafting (e.g., grafting labor, clips, chamber, etc.) accounted for 37% to 38% of the added cost of grafting, and grafting labor was 11.1% to 14.4% of the cost of grafted transplant production. Seed costs represented 52% and 33% of the added cost of grafting at the two sites, and indirect costs (e.g., soil, trays, and heating) accounted for 10% and 30% of the added cost of grafting. Our findings suggest that under current seed prices and with similar production practices, the feasibility of grafting in the United States is not disproportionately affected by domestic labor costs. Additionally, the economic models presented in this report identify the cost of production at various transplant stages, and provide a valuable tool for growers interested in grafted tomato transplant production and utilization.}, number={4}, journal={HORTTECHNOLOGY}, publisher={American Society for Horticultural Science}, author={Rivard, Cary L. and Sydorovych, Olha and O'Connell, Suzanne and Peet, Mary M. and Louws, Frank J.}, year={2010}, month={Aug}, pages={794–803} }
 @article{ruiz-rojas_sargent_shulaev_dickerman_pattison_holt_ciordia_veilleux_2010, title={SNP discovery and genetic mapping of T-DNA insertional mutants in Fragaria vesca L.}, volume={121}, number={3}, journal={Theoretical and Applied Genetics}, author={Ruiz-Rojas, J. J. and Sargent, D. J. and Shulaev, V. and Dickerman, A. W. and Pattison, J. and Holt, S. H. and Ciordia, A. and Veilleux, R. E.}, year={2010}, pages={449–463} }