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发病情况青枯病一般在玉米进入乳熟期后开始陆续发生,从感病到全株枯死,为期5—8天,最快的2—3天。叶片从叶尖或叶缘开始,发展到整叶和叶鞘,自下向上青枯雕萎,似早霜杀害或开水浸泡状。以后叶片逐渐枯死,果穗柄变软,苞叶逐渐干枯,大部分果穗下垂,籽粒不饱满,秃顶度增长,茎基部2—3节变黄褐色至褐色,节间中空,茎节外表变淡褐色,病部易破裂,根系变黄褐色,根毛极少,气生根外表皮易破落。病株后期遭风雨后即倒伏。各季玉米中,秋玉米比春玉米发病重,春玉米又比夏玉米发病重,但也有夏玉米比春玉米
The incidence of bacterial wilt generally begins after the corn enters the milky ripe stage one after another, from the disease to the entire plant withered, a period of 5-8 days, the fastest 2-3 days. Leaves from the leaf tip or leaf margin began to develop into the whole leaf and sheath, withered wither from the bottom up greenish, like early frost kill or soaked in water. After the leaves gradually withered, tassel handle softened, husk gradually dry, most of the ear drooping, grain is not full, bald degrees of growth, the basal 2-3 sections turn yellow brown to brown, internodes hollow, stem section appearance becomes pale brown , Department of disease prone to rupture, roots become brown, very few root hair, easy to break down the epidermis of aerial roots. After the strain was lodging after the storm. In each season of corn, autumn corn is more serious than spring corn, spring corn is heavier than summer corn, but there are also summer corn than spring corn