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灰霉病是冬春季保护地韭菜普遍发生的病害之一,多由叶尖侵染,并迅速向下发展使叶尖坏死。空气潮湿时病部腐烂,表面产生灰色霉层,空气干燥时多造成植株干尖,不仅影响产量,而且病叶常伴有霉味,使品质下降。低温高湿、光照不足是韭菜灰霉病发生蔓延的主要条件。温度在15℃～21℃,空气相对湿度在85%以上,病害易流行。长期连作有利于病菌积累,发病严重。氮肥施用过多、磷钾肥
Botrytis cinerea is one of the most common diseases of chives in winter and spring protected areas. It is mostly infected by the leaf tips and rapidly develops to make the leaf tips necrosis. Moist parts of the disease rot when the surface gray mildew layer, dry the air caused when the plant more dry tip, not only affect the yield, but often accompanied by musty leaf mold, the decline in quality. Low temperature and humidity, lack of light is the main condition for the occurrence of gray mold disease in chives. Temperature at 15 ℃ ~ 21 ℃, air relative humidity above 85%, easy to epidemic diseases. Long-term continuous cropping is conducive to the accumulation of bacteria, the incidence of serious. Too much nitrogen fertilizer, phosphorus and potassium fertilizer