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一、病害的发病条件、症状识别及其防治1.灰斑病(斑点病):发病条件是温度28℃~30℃,连续多雨,雨量大有利于灰斑病发生。种植过密,田间通风不良的地块发病就重。苗期至鼓粒期均可发生。该病主要侵害叶片,也可侵害茎、荚、种子。感病叶片初生圆形小斑点,而后扩大为赤褐色不规则形有霉状物的病斑,严重时叶片干枯破裂成孔而死。种子上病斑隆起有细小龟裂纹。防治措施:①农业防治:选用抗病品种;精选种子,清除
First, the disease conditions, symptoms identification and prevention 1. Gray spot disease (spot disease): the incidence of temperature is 28 ℃ ~ 30 ℃, continuous rain, rainfall is conducive to gray spot disease. Planting is too dense, poor ventilation in the field of the disease is heavy. Seedling to drum grain period can occur. The disease mainly affects the leaves, but also against stems, pods, seeds. Sick leaves young round small spots, and then expanded to auburn irregular mildew disease spots, severe dry leaves rupture into holes and died. Plaque on the protuberance with tiny turtle cracks. Control measures: ① agricultural control: selection of resistant varieties; selection of seeds, remove