一、发病症状1.黄瓜灰霉病的识别。黄瓜灰霉病危害花、瓜条、叶片、茎蔓,多从凋谢的雌花侵入,引起花腐烂,使其长出灰褐色霉层。病害向幼瓜扩散,病部先发黄,后长出白霉并逐渐变为浅灰色,黄瓜生长停止,最后腐烂脱落。叶片上多形成直径20～25毫米的大型斑点,病斑长出少量灰色霉点。茎蔓发病后,瓜蔓折断,出现烂秧。 First, the symptoms 1. Cucumber gray mold identification. Botrytis cinerea endangered the flowers, melons, leaves, stems and vines, mostly from the withered female flowers invaded, causing flower decay, so that it grows gray-brown moldy layer. Disease spread to young cucumbers, disease first hair yellow, grow white mold and gradually become light gray, cucumber growth stops, and finally decay. More leaves on the formation of large diameter 20 to 25 mm spots, lesions grow a small amount of gray moldy. After the onset of stalk, melon broken off, there rotten seedlings.