Effect of sublethal dose imidacloprid treatment of Aromia bungii on its parasitoid, Sclerodermus guani

Abstract Aromia bungii Faldermann is an important economic wood borer infested many fruits and ornamental tree in Rosacea family, and is listed as a world quarantine pest. Both chemical and biological control methods have been used to control its damage, but what is their interact effect is unknown. 【Objective】To figure out whether sublethal imidacloprid stimulate the physical and biochemical response of A. bungii larvae so to affect the parasitism rate and offspring development of its parasitoids Sclerodermus guani. 【Method】We detected the activity of detoxification and defense enzymes in the A. bungii larvae treated with sublethal dose of imidacloprid, and investigated its effects on the S. guani . Firstly, LC10, LC20, and LC30 of the imidacloprid were tested to determine the sublethal dose. Then the larvae were treated with the sublethal dose of imidacloprid with artificial diet. 【Result】The sublethal imidacloprid can induce the activity of GST enzyme and inhibition of the CarE activity in A. bungii larvae; the activity of CAT, SOD and POD enzymes was induced and there is a dose effect; the developmental duration of S. guani was not significantly affected, but the parasitism rate, fecundity, the emergence rate and the mortality rate were seriously affected compared with the control. 【Conclusion】The sublethal dose of imidacloprid can induce the strong physical and biochemical response of A. bungii larvae, and had a significant impact on the parasitism success rate and fecundity of S. guani . The results could help us to rational use of insecticides to collaborative with the biological control of the A. bungii with parasitoid.