Toxicity and Efficacy of Thirty Insecticides Against in Northeast China: Laboratory, Semifield, and Field Trials.

In soybean fields across Northeast China, Schrank (Thysanoptera, Thripidae) populations are increasing, posing a significant threat to soybean production. The aim of this study was to evaluate the toxicity, insecticide efficacy, and field performance of thirty insecticides against . Laboratory bioassays revealed that fenthion (LC = 2.26 mg/L), sulfoxaflor (LC = 4.28 mg/L), cyetpyrafen (LC = 4.94 mg/L), and imidacloprid (LC = 6.16 mg/L) exhibited the highest toxicity against . Pot experiments were subsequently conducted to assess insecticide efficacy. Seven days after application at the highest tested concentration, the insecticide efficacy of fenthion, sulfoxaflor, chlorantraniliprole, bifenazate, and malathion achieved 100% control efficacy. The four insecticides were selected for field trials based on their high toxicity and insecticide efficacy. Seven days after application, the field efficacy of fenthion at 11.25 g a.i.·hm, sulfoxaflor at 1.19 g a.i.·hm, cyetpyrafen at 8.10 g a.i.·hm, and imidacloprid at 11.25 g a.i.·hm exceeded 80%. Thus, these four insecticides hold strong potential for integrated management of . Overall, the findings provide a valuable reference for developing chemical control strategies against this pest.