1灰霉病1．1发病条件与症状此病主要为害花和幼瓜，多从开败的花侵入，使花腐烂，产生灰色霉层，以后由病花向幼瓜发展，使瓜顶尖褪绿，呈水浸状软腐、萎缩，病部生灰色零层。此病由半知菌灰葡萄抱真菌侵巢引起。病菌主要以分生抱子在土壤表层及病残体上越冬。分生抱于俗气流、 1 Botrytis cinerea 1.1 Conditions and symptoms of disease The disease is mainly harm flowers and young melons, many from the defeat of the flower intrusion, the flower decay, resulting in gray mold layer, after the disease from the disease to the development of young cucumbers, melon top fade Green, was submerged soft rot, atrophy, disease gray gray layer. The disease is caused by the half-know graying ash-grafted fungus. Pathogens are mainly superficial spores in the soil surface and sick over winter. Students derived from vulgarity flow,