1发生和为害青枯病一般在玉米进入灌浆期后开始发生(多在灌浆末期),乳熟末期至蜡熟期为青枯病的显症高峰期,发病愈早,对产量、品质影响愈大。一般从感病到全株枯死5~15d,快的只有2~3d,是一种暴发的毁灭性病害。该病一方面直接使果穗重量减轻,籽粒不饱满,不能正常成熟;另一方面是使茎秆损坏和倒伏,影响产量,所以 1 Occurrence and pest bacterial wilt generally begin after grain filling stage (mostly at the end of grain filling stage), and the peak period of milk wilt disease from the late milky stage to the mature stage of waxy mildew, the earlier the onset, the harder the yield and quality will be affected Big. Generally from the disease to the whole plant dead 5 ~ 15d, fast only 2 ~ 3d, is an outbreak of devastating diseases. The disease on the one hand directly to reduce the weight of the ear, the grain is not full, can not be normal maturity; the other hand, the stem is damaged and lodging, affecting the yield, so