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一、发生和为害青枯病一般在玉米进入灌浆期后开始发生。从感病到全株枯死只需5—8天,快的只需2—3天。病株一般结实少,秃顶多,甚至完全不能结穗,危害很大。一般春玉米比夏玉米发病重。发病愈早,对产量影响愈大。一方面是直接使果穗不饱满,重量减轻不能成熟;另一方面是使茎秆损坏和倒伏,影响产量。病害发生与气候条件有关,在13—32℃之间可引起发病。湿度
First, the occurrence and damage Bacterial wilt generally begins after the corn enters the filling period. From the disease to the whole body dead just 5-8 days, fast only 2-3 days. Strain generally less stubborn, bald and more, or even can not complete the ear, a great harm. The general incidence of spring corn than summer corn. The earlier onset, the greater impact on the yield. On the one hand is to make the ear is not full, weight loss can not be mature; the other is to make stalk damage and lodging, affecting the yield. Disease occurrence and climatic conditions, in 13-32 ℃ can cause disease. humidity