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棉花苗期病害对棉苗生育影响很大,它可使棉苗生育衰弱迟缓,延迟开花吐絮的时间,结铃减少,以至减产达30-40%,严重的甚致死亡,造成大量缺苗。棉苗病害的种类很多,大致可分为两大类型:一类是种子传染的病害如炭疽病、角斑病等;一类是土壤传染的病害如立枯病、红腐病、猝倒病等。在我国南部地区主要是炭疽病为害,而北部地区则主要是土壤
Cotton seedling disease has a great impact on the growth of cotton seedlings. It can weaken the growth of cotton seedlings, delay the time of flowering and dripping, reduce the number of bolls, and even reduce the yield by 30-40%. Serious deaths even lead to a large number of seedlings. There are many kinds of cotton seedlings disease, which can be divided into two types: one is seed-borne diseases such as anthracnose and angular leaf spot; the other is soil-borne diseases such as blight, red rot, cataplexy Wait. Anthrax is predominant in the southern part of our country, while the soil in the northern part is mostly predominant