Pharmacodynamic Test of Different Biological Pesticide to Control Cnaphalocrocis medinalis

Cnaphalocrocis medinalis is one of the main pests of rice in our country,and is serious to outbreak degree all year round in the Donghai area. The current of the prevention and control of pesticide mainly were organophosphorus and nereistoxin,problems of large dosage,more use times,and residue become increasingly serious. The field experimental results showed that,the control effect of 1.1%Alian SC 1 500 mL/hm2,13.4%Lianzuo EC 2 250 mL/hm2,Qintaibao D dosage form WP 2 400 g/hm2 used in peak time at the age of 1~2 were good.Among them,the control effect of Alian was the best,close to the chemical control effect in large area,and had the application and promotion prospect.