黄瓜灰霉病属于常发性病害,各地普遍发生,大棚和温室内黄瓜发病较重。黄瓜灰霉病主要为害幼瓜、叶、茎。幼苗受害,病菌常从叶缘侵入,空气潮湿时,表面产生淡灰褐色的霉层。成株叶片一般由脱落的烂花或病卷须附着在叶面引起发病,病斑近圆形或不规则形,边缘明显,表面着生少量灰霉。而且,黄瓜灰霉病属半知菌亚门真菌。病菌以菌丝体或分生孢子及菌核附着在病残体上,或遗留在土壤中越冬。 Botrytis cinerea is a common disease, occurs generally around the greenhouse and greenhouse cucumber heavier. Botrytis cinerea cucumber damage mainly, leaves, stems. Seedling victims, bacteria often invade from the leaf margin, the air is humid, the surface light gray brown moldy layer. Adult leaves generally fall off burnt or sick tendrils attached to the leaves cause disease, nearly circular or irregular lesion, the edge of the obvious, with a small amount of gray mold on the surface. Moreover, the cucumber gray mold is a semi-known fungus subfamily fungi. Pathogens to mycelium or conidia and sclerotia attached to the sick, or left in the soil overwintering.