最近,有不少农户反映,一些玉米田里有部分玉米苗心叶扭曲、畸形,不能展开,严重者呈大鞭子状,这种现象在往年也有发生,现将病因和预防措施介绍如下: Recently, many peasant households reported that some corn seedlings in some fields had twisted and malformed heart leaves that could not be found. In severe cases, they showed large whips. This phenomenon has also occurred in previous years. The causes and preventive measures are as follows: