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棉花枯、黄萎病是棉花上重要的土壤传播病害。棉花枯、黄萎病重病区种植抗病品种是控制此病害的基本措施。目前,在重病区种植抗病品种的一些地方出现了病害衰退现象,表现在抗病品种连茬种植后,抗病品种本身病情逐渐轻微和连种抗病品种几年后、换种感病品种病情也大为减轻。如我省曲沃县安居大队是棉花枯、黄萎老病区,从1965年起到现在一直种植抗病品种,病情程度由只能种抗病品种到能种耐病品种;由耐病品种病害普遍发生到几乎看不到病害症状。绛县西晋峪大队1972年前由于此两种病害普遍猖獗,严重地影响了棉花的计划面积。经种抗病品种2—3年后改种常规品种保苗率基本达到了一般大田密度要求。我所棉花枯、黄萎病圃13亩从1973年以来,其中
Cotton withered, Verticillium wilt is an important soil-borne disease on cotton. Cotton withered, Verticillium wilt disease-resistant cultivated varieties is the basic measure to control this disease. At present, some areas where disease-resistant cultivars are planted in the seriously ward area have experienced the phenomenon of disease decline. After the successive planting of disease-resistant varieties, the disease-resistant varieties themselves are slightly morbid and the susceptible varieties are replaced several years later. The condition is also greatly reduced. For example, the Quwo County Home Security Brigade in our province is a withered cotton wilt and yellow wilt. Since 1965, resistant varieties have been planted so far. The extent of the disease can only vary from resistant varieties to resistant varieties; To almost see the symptoms of the disease. Jiang County, Shanxi Jinyu Valley before 1972 due to the prevalence of these two diseases rampant, seriously affected the planned area of cotton. 2-3 years after the seed varieties resistant to conventional varieties seedling rate basically reached the general field density requirements. I cotton blossoms, Verticillium wilt nursery 13 acres since 1973, of which