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一、病害的识别及其防治(一)豇豆立枯病(豇豆基腐病)症状:幼苗和大苗均可发病。主要危害种子、种芽和子叶,严重时也危害茎基部和根部。出苗前受侵,种子、种芽和子叶变褐腐烂。出苗后发病,先在茎基部着生椭圆形至长条状红褐色凹陷斑,后病斑逐渐扩展绕茎1周,病部干缩或龟裂,土壤潮湿时茎上病斑出现浅褐色蜘蛛网状霉。病斑还向根部扩展,造成根部坏死。此病进展较慢,幼苗发病时不折倒。发病初期常见病苗叶片白天萎蔫,晚间恢复。若土壤潮湿时,白天叶片
A disease identification and prevention (a) cowpea damping-off (cowpea-based rot) symptoms: seedlings and seedlings can be disease. Major hazards to seeds, shoots and cotyledons, in severe cases also endanger the stem base and roots. Invaded before emergence, seeds, seeds and cotyledons browning rot. Emergence of the disease, first in the base of the stem ellipsoid to the long strip of reddish-brown spot, the lesion gradually extended around the stem 1 week, the Department of shrinkage or crack, the soil damp stem spots appear light brown spider Net mold. Lesions also spread to the roots, causing necrosis of the roots. Slow progress of the disease, seedlings do not fall down when the disease. The early onset of disease leaves of common disease wilting during the day, night recovery. If the soil is damp, it leaves during the day