EPG Reveals Dinotefuran's Efficiency in Suppressing the Feeding Behavior of Frankliniella occidentalis on Kidney Bean Leaves.

Abstract

Western flower thrips (WFT), Frankliniella occidentalis (Thysanoptera: Thripidae), is one of the serious damage pests on agricultural production globally. Dinotefuran is an effective insecticide to control this pest. This study compared the feeding behavior and feeding area of F. occidentalis on the kidney bean leaves under four treatments: F. occidentalis, whether treated with dinotefuran (DWFT) or untreated (CWFT), each fed on kidney bean leaves that were either treated with dinotefuran (DP) or untreated with dinotefuran (CP). (labeled as: DWFT-DP, CWFT-DP, DWFT-CP, and CWFT-CP (control), respectively). After 72 h, the LC₅₀ and LC₂₅ of dinotefuran against F. occidentalis were 39.018 mg L^-1 and 20.441 mg L^-1, respectively. The total number of probes, total time probing, the number and duration of noningestion probes and short-ingestion probes were significantly lower in DWFT-DP and CWFT-DP compared with the control, while the total duration of non-probing significantly increased, and a significant reduction in the number and total duration of long-ingestion probes was observed only in DWFT-DP. In contrast, there were few significant changes in the feeding behavior of F. occidentalis in DWFT-CP compared to control, with minimal effect on these electrical penetration graph parameters. Moreover, the feeding area of F. occidentalis decreased significantly by 39.20% and 48.58% in CWFT-DP and DWFT-DP than that in control, respectively. This study indicates that F. occidentalis feed on kidney bean leaves treated by sublethal concentrations of dinotefuran, and that their feeding behavior, ingestion, and feeding scars are impaired, and the effects are stronger in treated thrips than untreated ones.