一、霜霉病 1.症状此病在各地葡萄产区都有不同的危害,发生于叶片、嫩梢、果实、花梗等所有幼嫩部分,在多雨、多雾、多露、低温高湿情况下易发生,一般在7月下旬至8月间为发生盛期,叶片发病,初朗为半透明边缘不清晰油渍状小斑点,后扩展为黄色至褐色多角形斑点,并相互愈合成大斑,潮湿时叶背有一层灰白色的霉状物,病斑最后变褐干 First, the downy mildew 1. Symptoms The disease in different parts of the grape have different hazards occurred in the leaves, tender shoots, fruits, pedicels and all other young parts, in rainy, foggy, dew, low temperature and humidity The next prone to occur, usually in late July to August for the peak, the incidence of leaves, early Lang for the translucent edge of the oil-like small spots, then expanded to yellow to brown polygonal spots, and mutual healing into large spots , Wet leaves when a layer of gray mildew, lesion last brown