Effectiveness of CyazypyrTM for interfering with transmission of tomato yellow leaf curl virus by Bemisia tabaci on tomato

Growth room and field studies were conducted to determine the efficacy of Cyazypyr™ (a.k.a. DPX-HGW86 and cyantraniliprole) in preventing transmission of Tomato yellow leaf curl virus (TYLCV) by biotype B of Bemisia tabaci. For the growth room studies, foliar sprays of cyazypyr at 100 g ai/ha reduced TYLCV transmission, similar to pymetrozine at 100 g ai/ha. Drench applications of cyazypyr at 1, 2.5 and 5 mg ai/plant resulted in significant reductions of TYLCV transmission, being comparable to imidacloprid at 0.7 mg ai/plant. For the field study, drench applications of either cyazypyr or imidacloprid resulted in about 80, 70 and 50% fewer plants with symptoms of TYLCV compared to the control when subplots were inoculated 3, 7 and 14 days after treatment, respectively. No differences were observed when subplots were inoculated 28 days after treatment.