Safety Evaluation of Four Insecticides on Trichopria drosophilae in Indoor Condition

PurposeTo evaluate the safety of the different insecticides to adults of Trichopria drosophilae, and to provide scientific basis for comprehensive control and rational application of pesticides to Drosophila suzukii.

MethodThe indoor toxicity of four different kinds of insecticides to T. drosophilae was determined by finger-tube pesticide film method, and the safety of T. drosophilae was evaluated.

ResultThe LC₅₀ of lambda-cyhalothrin for adult female and male of T. drosophilae was the lowest, which was 19.700 mg/L for female and 18.176 mg/L for male, respectively. The highest LC₅₀ value was spinetoram, which was 228.640 mg/L for females and 193.632 mg/L for males, respectively. The LC₅₀ of four insecticides for females of T. drosophilae was higher than that for males. Among which, acetamiprid and lambda-cyhalothrin have held moderate risk to female and male of T. drosophilae, matrine has held low risk, spinetoram has held low risk to female and moderate risk to male.

ConclusionMatrine and spinetoram are less toxic to T. drosophilae, so they can be used as priority pesticides in controlling Drosophila pests. Acetamiprid and lambda-cyhalothrin are slightly more toxic to T. drosophilae, so it should be avoided during the active period of T. drosophilae.