ARTHROPODS IN RELATION TO PLANT DISEASE Use of Honeydew Production to Determine Reduction in Feeding by Bemisia tabaci (Hemiptera: Aleyrodidae) Adults When Exposed to Cyantraniliprole and Imidacloprid Treatments

Bemisia tabaci (Gennadius) whiteßy populations produce economically important damage to crops by their direct feeding and also by transmitting plant viruses. Although there are several methods to reduce B. tabaci damage, most growers rely on the use of insecticides to decrease populations of this pest. Insecticides that reduce feeding of whiteßy adults may also reduce the transmission of viruses that are harmful to crop plants. However, demonstrating the feeding reduction has proved challenging. In this study, water-sensitive paper was used to determine whiteßy adult feeding, indirectly through honeydew production, when insects were placed on insecticide-treated and untreated plants. Plant treatments with two formulations of cyantraniliprole (Cyazypyr) showed a reduction in the amount of honeydew produced by B. tabaci adults equivalent to imidacloprid. The reduction in the amount of honeydew produced indicates reduced insect feeding and the possibility for a reduction in virus transmission. Plant treatments with two formulations of cyantraniliprole also resulted in higher mortality than imidacloprid.