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一、霜霉病 俗称霜叶、枝干。一般9月下旬开始发病,10～11月盛发于莲座期,气温忽冷忽热、阴雨连绵发病重。该病主要危害叶片,初期为水渍状小斑,以后逐渐扩大,色泽由淡绿色渐转为黄色至黄褐色,病斑受叶脉限制而形成多角形或不规则形,在病叶背面长出白色霜状霉层,雨后、雾后或早晨露水未干时最易见到,发病重时叶片变黄变枯。发病初期,及时用50％多菌灵800倍液、75％百菌清500倍液、72.2％普力克水剂600～800倍液、64％杀毒矾
Downy mildew, commonly known as cream leaves, stems. The general onset of disease in late September, 10 to November in the rosette period, the temperature suddenly hot and cold, heavy rain and rainy. The disease is mainly endanger the leaves, the early stage of water-like small spots, and then gradually expanded, the color gradually changed from light green to yellow to brown, the lesion is limited by the formation of veins polygonal or irregular shape, the back of sick leaves grow White cream-like moldy layer, after the rain, fog or morning dew dry the most easily seen, the incidence of heavy yellow leaves turn yellow. Early onset, timely use of 50% carbendazim 800 times, 75% chlorothalonil 500 times, 72.2% Pulikuxu 600 to 800 times, 64% anti-virus alum