Study on Potential Impact of Deltamethrin on Habrobracon hebetor Say

This study aims to clarify the potential effect of sublethal of deltamethrin on H. hebetor, the toxicity of deltamethrin to H. hebetor was determined by the residual film method, and the effect on the reproductive ability of the maternal generation and the development of the F₁ generation was further investigated. The results showed that deltamethrin treatment significantly reduced the survival rate of H. hebetor, which gradually decreased with the increase of treatment time and treatment dosage. For H. hebetor treated with sublethal dosage (LC₃₀ and LC₅₀) of deltamethrin for 2 d, the LC₅₀ treatment group had the lowest female longevity (11.40 d), fecundity (225.40 eggs) and oviposition durations (11.00 d). The paralytic ability of the H. hebetor was significantly reduced after treated with sublethal dosages of deltamethrin, but there was no significant difference between the LC₃₀ and LC₅₀. The total number of paralyzed hosts of the H. hebetor decreased from 129.80 in the control group to 82.80 in the LC₃₀ treatment group and 77.60 in the LC₅₀ treatment group. The average daily number of paralyzed hosts of H. hebetor treated with sublethal dosage of deltamethrin was significantly lower than that of the control group from the 6th day of parasitism. Sublethal dosages of deltamethrin negatively affected the longevity, reproductive ability and paralysis ability of the maternal generation of H. hebetor. No effect of sublethal dosage of deltamethrin on the developmental time of F₁ generation of H. hebetor. The results of this study can provide reference information for the rational application of deltamethrin and the scientific release of H. hebetor for effective control of grain storage pests.