Studies on the management of sweetpotato whitefly, Bemisia tabaci, and Tomato yellow leaf curl virus in tomato
Dempsey, Meredith Morgan
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A field crop tunnel experiment was conducted to study viruliferous whitefly, Bemisia tabaci, and Tomato yellow leaf curl virus (TYLCV) spread across virus-susceptible tomatoes as mitigated by insecticide. Both whitefly presence and viral presence were distributed in close proximity to the source plant with very minor impact of insecticide treatments. A split-split plot experiment was used to examine the effects of TYLCV resistant cultivars, new insecticides, and reflective mulch treatments efficacy on reducing whitefly incidence and TYLCV spread. Results showed that reflective mulches significantly reduced whitefly incidence and presence of TYLCV symptoms. Reflective mulch treatments trended toward greater yields in comparison to the non-reflective mulch. The sub-treatment of different chemicals showed that the two insecticide treatments suppressed whitefly populations, but there was no significant effect on TYLCV incidence compared with the check. Virus - resistant tomato cultivars did not impact whitefly incidence, but showed the strongest reduction in virus disease incidence compared with the check. Host plant resistant tomato and reflective mulches provided the bulk of the protection against TYLC disease incidence and damage in these studies.