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棉花枯、黄萎病是世界上各产棉国家里为害最大的两种土传病害、病菌在棉田土壤中定殖后,能够长期存活,不断积累,迅速扩展,并造成棉花死苗缺株,轻者减收,重者绝产。据1982年不完全统计,全国棉花枯、黄萎病发病面积已达2200多万亩,重病田678万亩,其中绝产面积为31万亩,估计每年损失皮棉150—200万担,已成为当前棉花生产上的一大问题,也是农作物病虫害防治研究攻关课题之一。一、传播为害的概况
Cotton withered, Verticillium wilt is the most damaging soil-borne disease in all cotton-producing countries in the world. After colonization in the cotton soil, the bacteria can survive long-term, accumulate and expand rapidly, Light reduction, heavy emphasis on abortion. According to incomplete statistics in 1982, the area of morbidity of cotton wilt and verticillium wilt reached more than 22 million mu and 678 million mu of severely ill crops, of which 310,000 mu were abortive. It is estimated that the annual loss of lint is 150-200 million and has become One of the major problems in current cotton production is also one of the key research topics in the prevention and control of crop pests and diseases. First, the dissemination of damage profile