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1二叶期前1.1症状主要发生在幼苗刚出土到二叶期前,玉米心叶不能抽出,幼叶皱缩扭曲不能完全展开,形成D型苗,植株矮化、发育畸形,出苗率低。1.2发生原因苗前除草剂损伤,玉米播后苗前使用乙草胺不当、异丙甲草胺等土壤封闭处理除草剂。1.3防治方法轻度可自然恢复,畸形苗较少时可通过间苗拔除,
1 before the second leaf period 1.1 Symptoms mainly occurred in the seedlings just unearthed before the second leaf stage, the heart of corn leaves can not be extracted, shrinkage of young leaves can not be fully expanded and distorted, the formation of D-type plants, plant dwarf, developmental deformity, low emergence rate. 1.2 The causes of pre-emergence herbicide damage, maize sowing before the use of inappropriate acetochlor, metolachlor and other soil closed treatment of herbicides. 1.3 prevention and treatment of mild natural recovery, less malformation seedlings can be removed by thinning,