韭菜发生干尖、干叶 ,乃是拱棚覆膜韭菜生产的常见病。其妨碍植株生长 ,影响韭菜品质 ,干叶严重时则失去了商品价值。一、症状及原因１ 高温“烤苗”受害植株外侧叶的叶尖 ,先开始变成苯褐色 ,随后叶片逐渐枯死。晴天 ,棚内温度常可达到３０℃以上 ,如若通风不及时 ,或者久阴骤 Leek dry tip, dry leaves, but the arch shed leek production of common disease. It hinders the growth of plants, affecting the quality of chives, dry leaves when the loss of the value of the goods. First, the symptoms and causes 1 high temperature “roasted seedlings” affected plant lateral leaf blade tip, first began to become beryl, then the leaves gradually died. Sunny day, shed temperature can reach more than 30 ℃, if the ventilation is not timely, or long shade