[Objective] The aim was to study control effect of different concentrations of Bacillus thruingiensis (Bt) on Hlyphantria cunea (Dru-ry).[Method] We used different concentrations of Bt suspension to control Hlyphantria cunea (Drury) in laboratory and determined the control effect.[Result] Different concentrations of Bt suspension also had different effects on control of Hlyphantria cunea (Drury), and within a certain concentration range the treatment effect increased with the increase of concentration.Bt diluted 500 times and diluted 800 times liquid both had good control effect on Hlyphantria cunea (Drury).[Conclusion] Considering the death rate of Hlyphantria cunea (Drury) and processing cost, 800 times diluted liquid of Bt should be the best concentration for controlling Hlyphantria cunea (Drury).
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