Field Efficacy Experiment of 40% Fenobucarb + Chlorpyrifos EC on Cnaphalocrocis medinalis

Using rice varieties Ningjing No.3 and Zhendao No.11 as the materials,the field efficacies of 40% fenobucarb+chlorpyrifos EC,30% triazophos + chlorpyrifos EC,36% dipterex+triazophos EC,40% profenofos + chlorpyrifos EC on Cnaphalocrocis medinalis were compared.The results showed that the control efficacy of 40% fenobucarb+chlorpyrifos EC was better.When it was used with the dose of 1 800 ml/hm2 at the egg hatching peak,the control efficacy and the leave protecting effect was 95.9% and 92.4%,respectively,which was at the same level comparing with that of 150 mL/hm2 of 20% chlorantraniliprole SC,and that of 1 800 mL/hm2 and 2 250 mL/hm2 of 50% phenthoate.