关键词: 蚊虫, 生物防治, 苏云金杆菌

Abstract: Bacillus thuringiensis var.israelensis(short for Bti) has been extensively used in the control of mosquito larvae with excellent results.But the short residual effect of common Bti formulations limited the larger scale application in the field and brought up the inconvenience in.the transportation and storage as well.This study focused on the laboratory evaluation of larvicidal efficacy and persistence of Bti encapsulated formulation,at different dosages,against larvae of An.sinensis Cx.pipiens pallens and Ae.albopictus.The results indicated that the formulation is of certain floating ability and is stable in aquatic environment,with the long residual larvicidal activities.At the dosage of 1.25 ppm,the formulation resulted in excellent larvicidal efficacy against Ae.albopictus larvae within 4 weeks after appli cation.It is recommended that 0.25ppm,1.25ppm and 0.05ppm be required for the control of An.sinensis,Cx.pipiens pallens and Ae.albopictus larvae respectively,to be applied at 2-3 weeks interval.