论文部分内容阅读
棉花苗期,生长幼嫩,抗病力弱,易于遭受多种病菌的侵害,尤其是在寒流侵袭,低温多雨之年,苗病常常大发生,引起大量的烂籽,病苗和死苗。种类与分布棉苗病害种类很多,可分为棉苗根病和叶病两大类。根病类主要包括立枯病、炭疽病、猝倒病、红腐病;叶病类主要包括褐斑病、轮纹斑病、角斑病、疫病、茎枯病、枯萎病。北方棉区苗期根病以立枯病为主,多雨年份,猝倒病也十分突出,其次是炭疽病和红腐病,叶病主要是褐斑病和枯萎病。南方棉区苗期根病以炭疽病和立枯病为主,其次是猝倒病和红腐
Cotton seedling, young growth, weak resistance, susceptible to a variety of pathogens, especially in cold invasion, cold and rainy years, often occur Miao disease, causing a large number of rotten seeds, disease and dead seedlings. Kinds and distribution There are many types of cotton seedlings disease, can be divided into two kinds of cotton seedling root disease and leaf disease. Rhizoctonia mainly includes blight, anthracnose, damping-off and red rot. Leaf blight mainly includes leaf spot, ring spot, angular leaf spot, blight, stem blight and blight. Northern blight seedling root blight-based, rainy years, damping-off disease is also very prominent, followed by anthracnose and red rot, leaf disease is mainly brown spot and blight. Southern cotton seedling root disease with anthracnose and blight-based, followed by damping-off disease and red rot