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Field Evaluation of Tomato Cultivars for Tolerance to Tomato Chlorotic Spot Tospovirus

S. Zhang, X. Fan, Y. Fu, Q. Wang, E. McAvoy, and D. R. Seal

April 2019

Research

Fourteen tomato cultivars resistant to tomato spotted wilt tospovirus (TSWV) were evaluated for their tolerance against tomato chlorotic spot tospovirus (TCSV) under field conditions during the 2014–2015 and 2015–2016 growing seasons in Homestead, FL. All TSWV-resistant tomato cultivars had significantly (P < 0.05) lower disease incidence of TCSV, compared with the commercial standard cultivars ‘FL 47’ or ‘Sanibel’, exhibiting intermediate to high levels of tolerance to TCSV. There was no significant effect of tomato genotype on the thrips vectors, western flower thrips (Frankliniella occidentalis) and common blossom thrips (F. schultzei). All tested tomato cultivars had equivalent or greater yields of total marketable fruit compared with the standard cultivar Sanibel. Particularly, in the third trial with disease incidence of 25% on Sanibel, ‘BHN 1064’ had significantly greater total yield and yields of extra-large and large fruit compared with Sanibel. ‘SV 7631TD’ and ‘Brickyard’ had significantly greater extra-large fruit yield and medium fruit yield, respectively, compared with Sanibel. Results from this study show that TSWV-resistant tomato cultivars were tolerant to TCSV under field conditions of south Florida, indicating that the use of genetic resistance in commercial tomato cultivars is an effective strategy to manage TCSV.

doi:10.1094/PHP-02-19-0010-RS

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