Abstract:
Objective To determine the control efficiency of six insecticides (emamectin benzoate, spinetoram, clorfenapyr, chlorantraniliprole, lufenuron and indoxacarb) on Spodoptera frugiperda and their toxicity to Trichogramma chilonis Ishii.
Methods Foliar spray application was used to evaluate the control efficiency of those insecticides on Spodoptera frugiperda in the field, leaf dipping was adopted to examine the toxicity of those insecticides to the second-instar larvae of S. frugiperda in the lab, and residues contact was carried out to test the toxicity of those insecticides to T. chilonis.
Results Those tested insecticides had acute and long-lasting toxicity to S. frugiperda. The control efficiency was 78.68%-95.75%, more than 90%, and 88.27%-96.3%, respectively, on the 1st, 3rd and 7th day after insecticide application. Emamectin benzoate, spinetoram, clorfenapyr and chlorantraniliprole were highly toxic to T. chilonis, with half of their field recommended dosage causing mortality rates of 100%, implying the application of those insecticides in the field is dangerous to T. chilonis. However, the toxicity of lufenuron and indoxacarb to T. chilonis was low.
Conclusion Emamectin benzoate , spinetoram, clorfenapyr and chlorantraniliprole can be used first for emergency control of S. frugiperda. Lufenuron and indoxacarb can also be used in the integrated pest management of S. frugiperda.
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