苦瓜白斑病是由一种叫苦瓜尾孢菌引起的真菌性病害。主要为害叶片,早期出现褪绿变黄的圆形小斑点,逐步扩展成近圆形或不规则形,直径1～4mm的灰褐色至褐色病斑,边缘较明显。病斑中间灰白色,多角形或不规则状,上生稀疏浅黑色霉状物,在潮湿时易看见,易造成病斑穿孔。 该病以菌丝体或分生孢子在病残体上越冬,为翌年侵染源。通过气流或雨水传播到苦瓜叶片上侵染,引起发病。由病斑上产生的分生抱子继续传播再侵染。一般在5～9月份高温期发生。虽然不会使叶片枯死,但造成叶片 Bitter melon white spot disease is caused by a fungus disease caused by bitter Melon. The main damage to the leaves early pale green yellowing spots small spots, and gradually expanded into nearly circular or irregular, diameter 1 ~ 4mm gray brown to brown lesions, the edge more obvious. Gray spots in the middle of white, polygonal or irregular, ascending sparse pale mildew, easy to see in the wet, easy to cause lesions perforation. The disease to mycelium or conidia overwintering in the sick, the following year’s source of infection. Through the air or rain spread to bitter gourd leaf infection, causing the disease. Spleen produced by the lesions continue to spread and re-infection. Generally occurs in 5 ~ September high temperature period. Although it will not make the leaves wither, but cause the leaves