大葱病害发生与防治

• 作 者: 孙志强
• 机 构: 吉林省大安市龙沼镇新风农校,
• 出 处: 农村科学实验
• 发表日期: 1999年08期
• 关键词: 大葱病害 紫褐色 紫斑病 花薹 防治方法 治疗作用 导气

一、主要病害 1.紫斑病:是大葱的常见病害,主要发生在叶片、叶鞘、花柄、花薹上,多从叶尖开始发病,病斑初呈紫褐色小斑点,逐渐向上扩展蔓延,扩大成暗紫色椭圆形或纺锤形病,斑,病斑融合或环绕叶片,使叶片折倒,严重时叶片大量枯死,鳞茎受害半湿性腐烂。

First, the main disease 1. Purple spot disease: is a common disease of green onions, mainly in the leaves, leaf sheaths, flower stalk, flower stalk, and more from the tip began to attack the lesion was purple brown small spots early, and gradually spread upward spread, Expand into a dark purple oval or spindle disease, plaque, lesion fusion or around the leaves, the leaves fold down, a large number of dead leaves in severe cases, bulbs affected by half-wet decay.