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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。1.除草剂药害玉米表现为严重的矮化,心叶扭曲,不能展开,且有分杈现象,扭曲叶片没有破损。发生原因:主要是施用含烟嘧磺隆的玉米苗后除草剂。其原因主要有:国产的烟嘧磺隆纯度不够,引起药害;高温时间喷药,或重喷也造成药害;玉米超过5叶的龄期,或药液喷到心中,引起扭曲、叶变白、或烂心;除草剂施用过晚,玉米会产生
Recently, many peasant households reported that some corn seedling leaves in some corn fields have distorted and malformed leaves that can not be unfolded. In severe cases, they appear like big whips. This phenomenon has also occurred in previous years. The causes and preventive measures are as follows. 1. Herbicide harm maize showed severe dwarf, distorted heart leaf, can not expand, and the phenomenon of bifurcation, twisted leaves without damage. Reason: The main application of nicosulfuron corn seedling herbicide. The main reasons are: domestic Nicosulfuron purity is not enough, causing injury; high temperature spraying time, or re-spray also cause injury; corn more than 5 leaf age, or liquid spray into the heart, causing distortion, leaves White, or rotten; herbicide applied too late, corn will produce