Abstract: In order to clarify the insecticidal effects of 7 insecticides combined with Fusarium equiseti and their mixture on Myzus persicae, this study used leaf soaking method to measure the indoor toxicity effects of F. equiseti, single insecticide, and a mixture of F. equiseti and single insecticide on M. persicae. The stronger insecticides were screened and mixed with F. equiseti to evaluate their control effects on M. persicae in greenhouses. The indoor toxicity test results showed that the toxicity of the seven insecticides was all below 35 mg/L, and the order of toxicity was abamectin, afidopyropen, imidacloprid, rotenone, cyantraniliprole, matrine, and flonicamid. The LC₅₀ of JMF-01 to M. persicae was 3.01×10⁶ spores/mL. Except for the toxicity of the mixture of flonicamid and F. equiseti which was less than 120, the co-toxicity coefficients of the other drugs mixed with F. equiseti were all greater than 120, indicating a synergistic effect. Among them, matrine and F. equiseti mixed at a ratio of 1 (15 mg/L) to 1 (10⁷ spores/mL) had the highest co toxicity coefficient, which was 339. The greenhouse control effect of the mixture of F. equiseti and afidopyropen can reach 88.28% on the 10th day, and the best control effect of 83.44% is achieved on the 14^th day after mixing with rotenone. The toxicity and control effect of the combination of F. equiseti and insecticides on M. persicae are better than those of single agents. The combination not only reduces the dosage of pesticides, but also enhances the control effect, providing reference value for the biological control of M. persicae.

Key words: Fusarium equiseti, insecticides, Myzus persicae, co-toxicity, control effect