JIN Lei, ZHANG Wenzhe, ZHANG Chuanqing, ZHU Guonian, LIU Yahui. Evaluation of toxicity of nine commonly used pesticides to Trichogramma chilonis[J]. Chinese Journal of Pesticide Science, 2021, 23(4): 716-723. DOI: 10.16801/j.issn.1008-7303.2021.0103
    Citation: JIN Lei, ZHANG Wenzhe, ZHANG Chuanqing, ZHU Guonian, LIU Yahui. Evaluation of toxicity of nine commonly used pesticides to Trichogramma chilonis[J]. Chinese Journal of Pesticide Science, 2021, 23(4): 716-723. DOI: 10.16801/j.issn.1008-7303.2021.0103

    Evaluation of toxicity of nine commonly used pesticides to Trichogramma chilonis

    • To clarify the effect of nine commonly used pesticides, including tebuconazole, prochloraz, prothioconazole, difenoconazole, thifluzamide, azoxystrobin, chlorantraniliprole, indoxacarb and emamectin benzoate against natural enemy insect Trichogramma chilonis, the residual film method was used to determine the toxicities of nine pesticides and assess the effect of mixtures between different kinds of fungicides on the survival of T. chilonis. The results showed that prothioconazole, difenoconazole, thifenamide and azoxystrobin had low-risk against T. chilonis indicating by the median lethal rate (LR50) > 1 832 g/hm2 and the half lethal time (LT50) over 4 d. Indoxacarb and chlorantraniliprole were also low-risk agents, and both with LR50 > 916 g/hm2. The LT50 values of them were 2.94 d and 0.86 d, respectively. The LR50 of prochloraz and tebuconazole were 106 g/hm2 and 207 g/hm2, respectively, and the LT50 were 0.27 d and 0.35 d, respectively, which indicated them to be medium-risk agents. Emamectin benzoate was a high-risk agent with LR50 and LT50 of 0.53 g/hm2 and 0.16 d, respectively. When prochloraz or tebuconazole was mixed respectively with prothioconazole and thifluzamide, and tebuconazole mixed with azoxystrobin, significant reduction in the mortality rate of T. chilonis in the mixed treatment group was observed, and no significant difference with that of the acetone blank control. The results showed that chlorantraniliprole and indoxacarb had low toxicity to T. chilonis, and the usage of the mixture of different fungicides could reduce the toxicity of single dose to a certain extent. This study has provided theoretical instruction for the rational use of insecticides and fungicides in wasp release period.
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