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近几年,玉米生产中除栽培、常规病虫害、肥料使用等问题外,生产中出现了玉米顶尖腐烂病、玉米穗腐病、果穗灌浆受阻、穗分化过程中出现的缺行、秃尖、玉米苗后除草药害等问题,严重影响玉米产量和质量。一、玉米生产中的主要问题及症状表现(一)玉米顶尖腐烂病玉米从苗期到成株期都可发生顶尖腐烂病,苗期病株出现黄色条斑,叶片皱缩、扭曲、重病苗心部腐烂死亡;成株期上部叶片不展开,卷曲成牛尾状,腐烂部分有害虫蛀道状裂口,纵切面可见内部黑褐色腐烂。
In recent years, corn production in addition to cultivation, conventional pests and diseases, the use of fertilizers and other issues, the production of corn top rot disease, corn ear rot, ear rot filling, spike differentiation in the emergence of the deficiencies, bald tip, corn Post-emergence weeding and other issues, seriously affecting the yield and quality of corn. First, the main problems in the production of corn and symptoms (a) Corn Top rotten corn from the seedling stage to adult stage can occur top rot disease, seedling stage yellow streaks, leaves shrinkage, distortion, serious disease Heart decay death; the upper leaves of adult stage does not start, curled into oxtail, rotten part of the worm-shaped tunnel, internal dark brown rot can be seen.