4种种衣剂对玉米安全性及对草地贪夜蛾控制效果的评价

Safety evaluation of four seed coating agents on maize and its control effect on fall armyworm,Spodoptera frugiperda

草地贪夜蛾Spodoptera frugiperda是重要迁飞性入侵害虫,对我国玉米生产构成严重威胁。为了明确复配种衣剂对玉米安全性及对苗期草地贪夜蛾的防控效果,分别在2022年秋季和2023年春季选用48%氯虫·噻虫胺悬浮种衣剂、48%硫双·噻虫胺悬浮种衣剂、40%溴酰·噻虫嗪种子处理悬浮剂和42%氯虫·甲萘威悬浮种衣剂等4种种衣剂开展了田间试验,对玉米出苗、苗期关键生长指标、被害株率、叶片被害级别及草地贪夜蛾防控效果进行了分析。结果表明:4种种衣剂对玉米出苗和玉米苗期植株的生长发育均无不利影响,对玉米安全性良好。4种种衣剂处理在玉米苗后14 d对草地贪夜蛾的防效显著(P<0.05),以40%溴酰·噻虫嗪种子处理悬浮剂和42%氯虫·甲萘威悬浮种衣剂在防效和持效性方面表现更好。

Fall armyworm,Spodoptera frugiperda,is a vital migratory invasive pest,which poses a serious threat to maize production in China.In order to clarify the safety of compound seed coating agent on maize and the control effect on S.frugiperda in maize seedling stage,field experiments were carried out in autumn of 2022 and spring of 2023 with four kinds of seed coating agents,namely,chlorantraniliprole·clothianidin 48%FSC,thiodicarb·clothianidin 48%FSC,cyantraniliprole·thiamethoxam 40%FS and chlorantraniliprole·carbaryl 42%FSC.The key growth parameters of maize emergence and seedling stage,the rate of damaged plant,the level of damaged leaf,and the control effect on S.frugiperda were analyzed.The results showed that the four seed coating agents had no adverse effects on maize emergence,and the growth and development of maize plants,indicating it was safe to maize plants.The control effect of four seed coating agents on S.frugiperda was significant at 14 days after maize emergence(P<0.05),and cyantraniliprole·thiamethoxam 40%FS and chlorantraniliprole·carbaryl 42%FSC showed better control effect and prolonged efficacy against S.frugiperda.