西瓜、甜瓜是忻州地区种植面积最大的瓜类作物。近年来,这两种瓜上的病害种类多,危害重。对瓜类生产威胁最大的是枯萎病、炭疽病、霜霉病、白粉病等。一、瓜病危害严重枯萎病普遍发生。1985年据忻定盆地的瓜农反映,西瓜枯萎病普遍发生,死苗率10—20％。保德县有50％的西瓜地因枯萎病死苗,严重者死苗率达80％左右。1986年忻州 Watermelon, melon is Xinzhou area planted the largest melons crops. In recent years, there are many kinds of diseases on these two kinds of melons, which are very harmful. The greatest threat to the production of melons are blight, anthracnose, downy mildew, powdery mildew and so on. First, melon disease serious wilt disease occurs. In 1985, according to the melon farmers in Xinding Basin, the occurrence of watermelon wilt occurred frequently, and the rate of dead seedlings was 10-20%. Prudential County, 50% of watermelon due to blight dead seedlings, severe dead seedling rate of about 80%. 1986 Xinzhou