赵秀梅 郑旭 王连霞 杨代斌 刘颖 刘洋 王立达 李青超 王振营

摘要 为评价种衣剂防治玉米田双斑长跗萤叶甲的可行性，通过选用内吸性强、持效期长的种衣剂，设置常规剂量对玉米种子进行包衣处理，采取田间罩网小区试验，明确种衣剂对双斑长跗萤叶甲的防效及对玉米出苗、生长的安全性。结果表明，30%噻虫嗪FS、10%氟虫腈FSC、38%噻虫胺FSC、40%噻虫嗪·溴氰虫酰胺FS、30%噻虫嗪·氟虫腈FSC、30%噻虫胺·氟虫腈FSC、20%噻虫胺·氟啶虫酰胺FSC等7种种衣剂对玉米出苗、生长均安全;38%噻虫胺FSC有效成分用量7.6 g/kg种子处理对双斑长跗萤叶甲的防治效果为70.6%～78.5%，防效最好，显著高于除30%噻虫胺·氟虫腈FSC 7.5 g/kg处理外的其他种衣剂处理（P< 0.05），并且可使双斑长跗萤叶甲成虫羽化出土始现期、出土高峰期推迟5～10 d，可以使成虫高峰期避开玉米吐丝期。玉米田双斑长跗萤叶甲防控前移推荐使用38%噻虫胺FSC，有效成分剂量为7.6 g/kg种子。

关键词 双斑长跗萤叶甲;种衣剂;玉米;防治效果

中图分类号： S435.132

文献标识码： B

DOI： 10.16688/j.zwbh.2021102

Abstract In order to evaluate the feasibility of seed coating agents against Monolepta hieroglyphica in corn fields， several systematic insecticides with long lasting effect were selected to treat corn seeds at recommended dosages， and then the field experiments of covering plot with insect proof nets were used to clarified the control effect of seed coating agents against M.hieroglyphica and the safety of the seed coating agents to corn seedling and growth were also evaluated. The results showed that all seven seed coating agents， including thiamethoxam 30% FS， fipronil 10% FSC， clothianidin 38% FSC， thiamethoxam·cyantraniliprole 40% FS， thiamethoxam·fipronil 30% FSC， clothianidin·fipronil 30% FSC and clothianidin·flonicamid 20% FSC， were safe to the emergence and growth of corn seedlings. Clothianidin 38% FSC at the dosage of 7.6 g/kg seed provided the best control effect against M.hieroglyphica， with the efficacy ranged from 70.6% to 78.5%， followed by clothianidin·fipronil 30% FSC at 7.5 g/kg seed. Clothianidin 38% FS showed significantly better control effect against M.hieroglyphica than the other seed coatings except clothianidin·fipronil 30% FS （P<0.05）， which can postpone the onset date and the peak date of M.hieroglyphica adults by 5-10 days. In this manner， the peak adult period of M.hieroglyphica would not overlap with the corn silking period. It is recommended to use clothianidin 38% FSC for seed treatment to control of M.hieroglyphica with the active ingredient dosage of 7.6 g/kg corn seeds in corn field.

Key words Monolepta hieroglyphica;seed coating agent;corn;control effect

雙斑长跗萤叶甲Monolepta hieroglyphica （Motschulsky）属鞘翅目Coleoptera叶甲科Chrysomelidae长跗萤叶甲属Monolepta，又称双斑萤叶甲[1-2]。双斑长跗萤叶甲为多食性害虫，自2001年报道在陕西省岐山县为害玉米以来，发生呈逐年加重趋势，为害区域和面积不断扩大[3-4];2007年在辽宁省丹东、铁岭和鞍山等地普遍发生[5]，2010年黑龙江省大面积发生[6];2017年、2020年，在黑龙江省齐齐哈尔为害严重。目前，双斑长跗萤叶甲已经成为北方春玉米区及关中夏玉米生产上的重要害虫[7-12]。在黑龙江省，双斑长跗萤叶甲1年发生1代，以卵在寄主植物根部0～10 cm的土层中越冬，翌年5月下旬卵开始孵化，卵孵化持续时间长且不一致，导致幼虫的发生从6月一直持续到8月，幼虫主要在玉米根系周围活动[13-14]，为害玉米根系，在根系表面上形成隧道，甚至钻入粗壮的根系内取食，仅留下表皮，根系上的伤口呈红色，被取食过的部位毛细根生长不发达，地上部分并没有明显症状[13]。……