Control effects of 19%triflumezopyrim·chlorantraniliprole SC against main rice pests and its influence on two natural enemies

ObjectiveIn this paper,the effects of 19%triflumezopyrim·chlorantraniliprole SC againstmain rice pests (planthopper,rice stem borer and Cnaphalocrocis medinalis)in field were explored,and its influence on two natural ene-mies(spiders and Cyrtorhinus lividipennis)were evaluated to provide scientific basis for the promotion and application of it.MethodThe effective dose of 19%triflumezopyrim-chlorantraniliprole SC applied in the field trials were 34.20(low dose),42.75(medium dose),and 57.00(high dose)g/ha,the control insectides were 25%pymetrozine WP(90 g/ha), 200 g/Lchlorantranniliprole SC(30 g/ha),and 10%triflumezopyrim SC(25 g/ha),and blank control was clear water. Each treatment was repeated for four times and the whole plants were sprayed at tillering period.ResultThe results of 2015-2016 test indicated that the average control effects of 19%triflumezopyrim·chlorantraniliprole SC against rice plan-thopper reached 84.53%,89.95%,and 91.89%respectively 21 d after treatment by low,middle and high doses;the aver-age seedling protecting effects against rice stem borer reached 87.13%,89.47%,and 92.63% 32 d after treated by the three doses;the average control effects on C. medinalis were 94.34%,96.60%,and 98.09%25 d after spraying drugs;and the average leaf protecting effects on rice stem borer were 95.74%,96.56%,and 97.37%32 d after spraying drugs. 19%triflumezopyrim·chlorantraniliprole SC had certain effects on spiders. The number of spider in the field declined 1-7 d af-ter spraying it,but then rebound and exceeded the amount before traetment. Its effects on C. lividipennis was not obvious, and it was safer to C. lividipennis than pymetrozine.Conclusion19%triflumezopyrim-chlorantraniliprole SC has good control effects on rice planthopper,rice stem borer and C. medinalis,and exhibits longer persistence,less influence on spiders and C. lividipennis. It is safe to rice and can be promoted and applied in rice planting.