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一、玉米纹枯病近年来,玉米纹枯病在一些玉米产区发病日趋严重,而农民往往忽视对该病害的防治。纹枯病在春、夏、秋玉米上皆可发生,发病株率22%~71%,个别地块或品种甚至达100%,由该病导致的损失一般在15%左右,发病重时果穗腐烂,造成严重减产,成为制约玉米增产的重要病害因素之一。1、症状玉米纹枯病主要危害玉米叶鞘、叶片、茎秆和果穗,最初多由基部叶鞘发病,从下而上逐步扩展,典型症状为在叶
First, corn sheath blight In recent years, corn sheath blight incidence in some maize growing areas, and farmers often overlook the prevention and treatment of the disease. Rhizoctonia solani can occur on spring, summer and autumn maize, the incidence rate is 22% ~ 71%, and the average mass loss of individual land or varieties is up to 100%. The loss caused by this disease is about 15% Decay, causing serious cuts in production, becoming one of the important disease factors restricting the yield increase of corn. 1, the symptoms Corn sheath blight corn harms the main hazards sheaths, leaves, stalks and ears, the initial mostly by the incidence of basal sheath, gradually expanding from the bottom up, the typical symptoms of leaves