Decreased susceptibility to the neonicotinoid insecticides imidacloprid and thiamethoxam has been documented in Florida (Schuster et al. Intensive insecticide use has led to the development of resistance to key insecticides. tabaci and TYLCV with a combination of at-planting, drip injected and foliar insecticide applications. However it is common in Florida for growers to plant susceptible varieties and manage B. Tomato varieties resistant to TYLCV are available. 2009), one of the foremost producers of fresh market tomatoes in the United States ( USDA NASS 2011). Solanales: Solanaceae) production globally ( Czosnek & Ghanim 2011), and is the primary constraint to production in Florida ( Mossier et al. TYLCV impacts tomato ( Lycopersicon esculentum Mill. The silverleaf whitefly, Bemisia tabaci biotype B (Gennadius) (Hemiptera: Aleyrodidae) vectors many economically important crop viruses, including Tomato yellow leaf curl virus (TYLCV), a begomovirus in the family Geminiviridae. Cyazypyr, flupyradifurone, pyrifluquinazon, and sulfoxaflor represent distinct modes of action, and should contribute to future integrated pest management and integrated resistance management plans for B. Treatment effects on nymph densities were similar to treatment effects on egg densities. Egg densities on plants treated with cyazypyr, flupyradifurone, pyrifluquinazon, and sulfoxaflor were statistically similar within a given DAT interval for most trials.
Egg densities were very low in all insecticide treatments compared to untreated plants at 3 and 7 DAT. The other materials demonstrated greater efficacy than zeta-cypermethrin/bifenthrin and pymetrozine on 14 DAT. Egg densities tended to be statistically higher at 14 DAT than 3 or 7 DAT in the zeta-cypermethrin/bifenthrin and pymetrozine treatments. Whole plant egg and nymph counts were taken weekly for 3 wk after the introduction of whitefly adults. The residual effects of 4 new insecticides (cyazypyr, flupyradifurone, pyrifluquinazon, and sulfoxaflor) and 2 registered insecticides (pymetrozine and a combination of zeta-cypermethrin and bifenthrin) on egg and nymph densities of Bemisia tabaci biotype B were evaluated at 3, 7 or 14 days after treatment (DAT) of the tomato seedlings with insecticides.
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