Susceptibility of Bactericera cockerelli Sulc (Hemiptera: Triozidae) Nymphs to Sivanto® 200 SL (Flupyradifurone)

Abstract

Sivanto® 200 SL (flupyradifurone) was recently introduced into the Mexican market for the control of Bactericera cockerelli Sulc (Hemiptera: Triozidae) in different solanaceous crops such as potato, tomato, and pepper, which are important crops in Mexico. The objective of this study was to determine the toxicity of flupyradifurone on 5th instar potato psyllids in 3 field-collected populations and a laboratory susceptible one. There were no differences in susceptibility to flupyradifurone among the evaluated populations. The lethal concentration values (LC) at 50% of mortality ranged from 243.2 to 368.1 mg per L at 24 h, after 48 h of exposure, LC50 values were between 51.0 to 62.5 mg per L. The LC95 values at 24 h ranged from 2403 to 5265 mg per L, and at 48 h of exposure were between 506.5 to 936.9 mg per L. The relative toxicity (RT) at 50% of mortality was 4.07 to 4.97 times higher after 48 h than after 24 h. Moreover, an antifeedant effect associated with flupyradifurone decreased the amount of excreta after 24 h of feeding by 51, 42, and 75% at the flupyradifurone dosages of 30, 50, and 100 mg per L, respectively, relative to the untreated control.