Advisor University of California Fresno, California, United States
Abstract Text: Beet curly top virus, which is transmitted by the beet leafhopper (Circulifer tenellus) causes economic loss in processing tomato production in Central California annually. From 2015 to 2024, effect of insecticides on disease incidence were compared at the University of California West Side Research and Extension Center in seven experiments. Commercial processing tomato varieties were transplanted at the end of the transplanting season in this region (late-May to early-June). All irrigations were through sub-surface drip irrigation at a depth of 25 cm. Insecticide programs were evaluated that included cyantraniliprole applied to the transplants, and imidacloprid applied in the water applied at transplanting and/or through the subsurface drip irrigation system. The treatments were arranged in a four-replication randomized complete block experimental design. The disease incidence was evaluated at 14 to 28 day intervals. In five of seven treatments including imidacloprid applied in the transplant water, disease incidence was significantly lower than in the untreated control. In five of seven treatments including a cyantraniliprole-transplant application, beet curly top disease incidence was significantly lower than in the untreated control.
