Performances of the mixtures of chlorpyrifos,buprofezin and imidacloprid for control of the complex of planthoppers and rice stem borer in field

Four field experiments were conducted on performances of selected insecticide mixtures and dosages for control of the complex of planthoppers(mainly Sogatella furcifera(Horvath) and Nilaparvata lugens(Stl)and the rice stem borer,Chilo suppressalis(Walker)in Lujiang County,Anhui Province in 2002.The results showed that the control efficiency sampled 7 days after application of insecticides were 93.03% and 92.67% in treatment sprayed 48% chlorpyrifos EC 300 g(a.i./hm2)mixed with 10% midacloprid WP 30 g for the 3rd and 4th generations of the planthoppers,The control efficiency of 48% chlorpyrifos EC 375 g mixed with 25% buprofezin WP 150 g were 92.79% and 95.22% for the same two generaions,respectively.For the 2nd and 3rd generations of the rice stem borer,the control efficiency sampled 16 days after application of insecticides were 73.22% and 80.43% in treatment sprayed 48% chlorpyrifos EC 300 g(a.i./hm2)mixed with 10% imidacloprid WP 30 g,respectively.The control efficiency of 48% chlorpyrifos EC 375 g mixed with 25% buprofezin WP 150 g were 76.81% and 84.80%,respectively.The authors suggest to use these two kinds of mixtures and the dosages for control of the pest complex in similar areas.