一、早疫病1.主要症状特点叶片易染病,病斑黑褐色,圆形或近圆形,具同心轮纹,大小3~4毫米,湿度大时,病斑上生出黑色霉层,发病严重的叶片干枯脱落,致一片枯黄。2.防控技术①选用早熟耐病品种,适当提早收获②选择土壤肥沃的高燥田块种植,增施有机肥,推行配方施肥,提高寄主抗病力。③发病前开始喷洒可杀得三千1500倍液,或70%代森锰锌可或64%杀毒矾可湿性粉剂500倍液。二、晚疫病1.主要症状特点叶片易染病。染病后先在叶尖 First, the early blight 1. The main symptoms of leaf prone disease, spot dark brown, round or nearly circular, with concentric rings, the size of 3 to 4 mm, humidity, the disease produces black mold layer, the incidence of serious Leaves dry off, causing a yellow. 2. Prevention and control technology ① selection of precocious disease-resistant varieties, appropriate early harvest ② choose high fertile soil block cultivation, increased organic fertilizer, the implementation of formula fertilizer to improve host resistance to disease. ③ Before the onset of spraying can kill 3000 times the liquid, or 70% of mancozeb or 64% anti-virus alum wettable powder 500 times. Second, late blight 1. The main symptoms of leaf-prone disease. After the first tip in the disease