玉米种子丸粒化包衣处理对草地贪夜蛾的防治效果

The effect of prevention and control against Spodoptera frugiperda by corn seeds pelleting

本研究明确了乙基多杀菌素和氯虫苯甲酰胺丸粒化包衣后对玉米种子的安全性和玉米幼苗对草地贪夜蛾的防治效果,为玉米苗期草地贪夜蛾防治提供新技术。首先在室内验证了乙基多杀菌素和氯虫苯甲酰胺拌土后对草地贪夜蛾的防治效果,又进行了种子丸粒化包衣处理,测定了丸粒化包衣方式下药剂对种子萌发的影响和对草地贪夜蛾的防治效果。结果表明,250 mg/kg的乙基多杀菌素和氯虫苯甲酰胺拌土处理后,草地贪夜蛾对14 d的玉米苗的取食率分别为1.67%、5.01%,与对照组取食率27.02%差异显著。药种比为1∶100和1∶200的乙基多杀菌素和氯虫苯甲酰胺丸粒化包衣处理组与对照组的发芽率之间无显著差异。乙基多杀菌素和氯虫苯甲酰胺丸粒化包衣处理组在播种后第7天对草地贪夜蛾广州种群防治效果显著,其中药种比为1∶100的乙基多杀菌素丸粒化包衣处理组致死率最高为89%;两药剂丸粒化包衣处理组在播种后第21天对草地贪夜蛾云南种群仍有较好防治效果,两个浓度的乙基多杀菌素丸粒化包衣处理对草地贪夜蛾的致死率均达100%。本研究表明玉米种子丸粒化包衣技术可有效防控玉米苗期草地贪夜蛾的危害。

Our study clarified the safty of corn seeds and the prevention and control effect of Spodoptera frugiperda after corn seeds were pelletized with spinetoram and chlorantraniliprole,provide a new technology for the prevention and control of S.frugiperda during corn seedling.First,we verified the effects of spinetoram and chlorantraniliprole on the control of S.frugiperda after mixing soil,and then the effective pesticides were pelletized with corn,to determine the prevention and control effect of S.frugiperda by the new method seed-pelleting.The results showed that after 250 mg/kg of spinetoram and chlorantraniliprole mixing with soil,the feeding rates of S.frugiperda on 14-day corn seedlings were 1.67%and 5.01%,respectively,compared with those of the control group 27.02%difference is significant.There was no significant difference in the germination rate between the spinetoram and chlorantraniliprole pelletization treatment group and the control group with the drug-to-seeds ratios of 1∶100 and 1∶200.The spinetoram and chlorantraniliprole pelletization treatment group has a significant control effect on the Guangzhou population of S.frugiperda on the 7th day after sowing,and the highest lethality rate was 89%from the spinetoram pelletization with a drug-to-seeds ratio of 1∶100;the two pesticides pelletization treatment group still had a good control effect on the Yunnan population of S.frugiperda on the 21th day after sowing.The lethality rate of S.frugiperda reached 100%by the two concentrations spinetoram pelletization treatment.This study shows that the corn seed pelletization technology can effectively prevent and control the damage of S.frugiperda in the corn seedling stage.