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苗枯病是玉米的一种重要的苗期病害,由轮枝镰孢菌、串球镰刀菌、禾谷镰孢菌、玉米丝核菌等多种真菌单独或复合侵染引起,是苗期玉米根部或近地茎组织腐烂的总称。重病田发病率高达30%～40%,有的田块严重缺苗断垄,甚至毁种。识别要点玉米苗枯病从2叶1心期便可表现症状,主要发生在5月中、下旬,玉米生长4～7叶期。①种子发病先在种子根和根尖处开始产生褐变,后扩展到整个根系,根毛初期出现淡黄色至黄褐色侵染点,1～2天后即变为黄褐色水渍状坏死,严重时皮层腐烂,根毛脱落,无次生根或少有
Seedling blight is an important seedling disease of maize and is caused by single or complex infection of Fusarium verticillioides, Fusarium graminearum, Fusarium graminearum and Rhizoctonia solani. Corn root or near stem tissue rot collectively. Severe disease incidence as high as 30% to 40%, some fields severely lacking seedlings broken ridge, and even destroyed species. Identification of the main points of corn seedling blight from the 2 leaf 1 period can be symptoms, mainly in mid-May, late, corn growth 4 to 7 leaf stage. ① Seeds first began browning at the seed and root tips and then extended to the entire roots. The root hair appeared yellowish to yellowish brown at the initial stage of infection, and turned brownish-yellow after 1-2 days. In severe cases, Cortical decay, root hair loss, no secondary root or rare