To clarify the efficacies of high-efficiency insecticides and matching adjuvants against Grapholita molesta at the egg hatching and fruit-boring stages, in this study, laboratory egg immersion bioassays and field efficacy trials were conducted to systematically evaluate the control performance of nine insecticides(biopesticides, single-agent chemical pesticides, and mixed chemical formulations) combined with six functional adjuvants. The results showed that 35% of chlorantraniliprole water dispersible granules diluted at 7 000-fold and 22% of methoxyfenozide-chlorantraniliprole suspension concentrate diluted at 3 500-fold achieved optimal ovicidal effects at the egg hatching stage, with respective control efficacies of 84.43% and 83.94%. When combined with functional adjuvants BRS and MS, their control efficacies increased to over 90%. At the fruit-boring stage, 3% of emamectin benzoate suspension concentrate diluted at 1 800-fold exhibited a control efficacy of 74.5% among tested biopesticides. The two mixed formulations, namely 22% of methoxyfenozide-chlorantraniliprole suspension concentrate and 7% of chlorantraniliprole-deltamethrin suspension concentrate, yielded control efficacies exceeding 80% at 15 days after application. Organosilicon adjuvants SW8 and BRS displayed consistent potential for dosage reduction and synergism with all high-efficiency insecticides, maintaining control efficacies above 83% at 35 days post-spraying. According to differentiated orchard management scenarios, the combination of 3% of emamectin benzoate suspension concentrate and organosilicon adjuvants was recommended for organic green orchards. For conventional intensive-managed orchards, chlorantraniliprole-based insecticides mixed with modified vegetable oil or organosilicon adjuvants were preferable for egg hatching stage control, whereas mixed formulations coupled with organosilicon adjuvants were suggested to suppress fruit-boring larvae. Alternate application of biopesticides and chemical pesticides was proposed to delay the development of pest resistance in Grapholita molesta.
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