Study on control efficacy of the mixtures of acephate and imidacloprid against major pests of rice

The indoor results of comparative toxicity determined by the mixture of acephate and imidacloprid showed that co-toxicity coefficient of the optimal ratio on paddy borers was 169.60 and its effect was synergistic.The two-point efficacy trials on the major rice pests in the field showed that the control efficiency of 50% acetyl topiramate WP 1 500 g·hm-2 against Chilo suppressalis in two points were 97.1% and against Cnaphalocrocis medinalis was 88.9%.Its the control efficiency on planthoppers reached more than 90% at 15 days after application.These results demonstrated that the mixture has better control of rice pests and the product is suitable for spreading applications.