Abstract:

To understand the control effects of creating new pesticide of Dufulin against SRBSDV and the ideal control methods, the field trials were completed in rice through field spray about the pesticides of 30% Dufulin WP, 25% pymetrozine?thiamethoxam SC, 10% Ethofenprox MG, 8% Ninnan mycin AS and its combination. The results showed that, at original field tillering stage, at a dosage of 375 mL/hm2 and 900 g/hm2, the control effects of the combination about 25% pymetrozine?thiamethoxam SC WP and 30% Dufulin WP were better, i.e. 66.67%, and the control effects of 25% pymetrozine?thiamethoxam SC, 10% Ethofenprox MG, 30% Dufulin WP and 8% Ninnan mycin AS were 50.51%, 33.33%, 33.33% and 17.12%, respectively. At harvest stage, the control effects of the combination about 25% pymetrozine?thiamethoxam SC WP and 30% Dufulin WP also were better, i.e. 73.24%, and the control effects of the others treatment goups were 46.48%, 45.07%, 43.66% and 42.25%, respectively. Meanwhile, the crop yield showed that, being comparable with CK-treatment group, the increasing yield about combination about 25% pymetrozine?thiamethoxam SC WP and 30% Dufulin WP were better, i.e. 66.67%, and its of others treatment group were 249.75%, 230.7%, 208.65% and 104.7%, respectively. Therefore the combination of 25% pymetrozine?thiamethoxam SC and 30% Dufulin WP can control SRBSDV.