Sublethal effect of tetrachlorantraniliprole on the predatory capacity of Neoseiulus cucumeri
[Aim]This study investigates the sublethal effects of tetrachlorantraniliprole on the predatory efficacy of Neoseiulus cucumeris(Oudemans),a known predator of citrus the yellow mite.The safety of tetrachlorantraniliprole for these predatory mites was also evaluated.[Methods]The toxicity of tetrachlorantraniliprole on N.cucumeris was assessed under laboratory conditions using the leaf-dip method and the secondary poisoning phenomenon method.Additionally,the influence of sublethal doses of tetrachlorantraniliprole(LC15 and LC30,with water as a control)on the prey consumption,functional response,and predatory rate of female N.cucumeris preying on Eotetranychus kankitus(Ehara)was determined.[Results]The LC50 of tetrachlorantraniliprole on N.cucumeris,based on the leaf residue method and the secondary poisoning phenomenon methods,was 400.289 and 3.86×105 μg/mL,respectively.The functional response type of female N.cucumeris to E.kankitus was not affected by exposure to sublethal concentrations of tetrachlorantraniliprole and remained at Holling-Ⅱ.However,exposure of N.cucumeris to sublethal concentrations of tetrachlorantraniliprole resulted in increased prey handling time and a decrease in the maximum daily prey consumption.Furthermore,when exposed to sublethal concentrations of tetrachlorantraniliprole,the consumption and predation rate of N.cucumeris on E.kankitus significantly decreased.[Conclusion]The findings of this study indicate that tetrachlorantraniliprole has a negative effect on the predatory capacity of N.cucumeris.Therefore,a certain safety interval should be maintained when releasing N.cucumeris in conjunction with the use of tetrachlorantraniliprole.
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