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叶斑病主要包括褐斑病、黑斑病。褐斑病病斑圆形、暗褐色,较大,病斑外缘有黄色晕圈,后期有灰色霉状物;黑斑病病斑圆形、黑褐色,病斑周围无黄色晕圈,病斑比褐斑病小。防治方法:合理轮作;选用抗病品种。高温多雨的7、8月是防治叶斑病的重点时期,发病初期病叶率达到10%时,可喷洒50%多菌灵800倍液或70%代森锰锌800倍液,每隔15天喷药一次,共喷2~3次。锈病最先从底叶开始发生,叶片产
Leaf spot mainly include brown spot and black spot. Brown spot disease is round, dark brown, larger, the outer edge of the lesion has a yellow halo, the latter gray mildew; black spot disease round, dark brown, no yellow halo around the lesion, the disease Pity than brown spots. Prevention and treatment methods: reasonable rotation; selection of resistant varieties. High temperature and rainy July and August are the key period to prevent leaf spot disease. When the disease incidence rate reaches 10% at the initial stage, it can spray 800 times of carbendazim 800 times or 70 times of mancozeb 800 times every 15 A day spraying, a total of 2 to 3 times spray. Rust begins with the bottom of the leaf, the leaves produce