Study Of Screening Of Insecticides Combination And The Formulization To Control Cnaphalocrocis Medinalis On Rice

Since 1960's, the occurring of Cnaphalocrocis medinalis was more and moreserious. It has become prevalent and frequently occurring pest on the primary areas of the rice inour country, and that the extent of bringing about disaster to rice comes into prominence. Undercontrolling actuality and industrial policy, screening the pesticides to control Cnaphalocrocismedinalis are very important which are the safe, high efficient, harmfuless, low residual andfriendly to environment.By affirming the biological activity of single pesticide and screening the recipes toCnaphalocrocis medinalis, this study screened the pesticides compounding that had the high CTC.Chlorfenapyr, deltamethrin, chlorpyrifos, triazophos and monosultap had high biological activityand applied possibility. But triazophos and chlorpyrifos, chlorpyrifos and deltamethrin, fenobcarband chlorpyrifos, chlorpyrifos and chlorfenapyr, monosultap and chlorfenapyr, monosultap anddeltamethrin had different synergized action to Cnaphalocrocis medinalis, and their CTC aregreater than 200.We had done plot efficacy test with recipes after bioassary indoor, and completed thescreening of recipes. We gained two compounding(chlorpyrifos and chlorfenapyr, monosultap andchlorfenapyr) that had high efficacy, great foreground of development and novelty. We had donethe field efficacy test after making into the preparation: 12％chlorfenapyr·monosultap and 26％chlorfenapyr·chlorpyrifos to control Cnaphalocrocis medinalis had comparatively fine effect ofcontrolling insects and protecting leaves. They had obvious synergized action by contrast withsingle pesticide.Then we studied the preparation and analytical method of 12％chlorfenapyr·monosultapwith great efficacy and low cost. Its preparation is microemulsion. We analyzed it with highperformance liquid chromatograph, and instituted the quality standard. Finally, we had done theplot test and demonstration of large acreage, and screened 12％chlorfenapyr·monosultap ME tocontrol Cnaphalocrocis medinalis that had great value of market development.