The effect of three rates of cyantraniliprole on the transmission of tomato spotted wilt virus by Frankliniella occidentalis and Frankliniella fusca (Thysanoptera: Thripidae) to Capsicum annuum

Tomato spotted wilt virus (TSWV) is a thrips-transmitted virus that causes major losses in many crops worldwide. Management of TSWV is complex, requiring multiple preventive measures. Currently, there are few chemical options that control thrips populations before they feed upon and transmit TSWV to crop plants. Cyantraniliprole (Cyazypyr™) is an anthranilic diamide insecticide currently under development that exhibits anti-feedant properties. Transmission of TSWV by Frankliniella fusca (Hinds) to Capsicum annuum L. seedlings was reduced in plants treated with Cyazypyr™ applied to the soil at the rates of 1.45, 2.90 and 4.41 mg ai/plant. Mortality of F. fusca at 3 days post treatment did not differ significantly on excised foliage of Cyazypyr™ treated and control plants, but feeding injury was significantly less on treated foliage. Transmission of TSWV by Frankliniella occidentalis (Pergande) was not reduced in plants treated with 4.41 mg ai/plant.

Research highlights
► Applications of 1.45, 2.90 and 4.41 mg Cyazypyr™/plant to Capsicum annuum seedlings reduced TSWV transmission by Frankliniella fusca.
► Applications of 4.41 mg Cyazypyr™/plant to C. annuum seedlings did not reduce TSWV transmission by Frankliniella occidentalis.
► No significant differences between mortality of F. fusca confined on C. annuum leaves excised from water-treated and plants treated with 4.41 mg Cyazypyr™/plant were observed.
► Significant differences between feeding injury by F. fusca to C. annuum leaves excised from water-treated and plants treated with 4.41 mg Cyazypyr™/plant were observed.