摘要： 利用21个陆地棉品种（系）分析了黄萎病对皮棉产量的影响和影响病情指数的主要因素。结果表明，病情指数越高，产量损失越大；病情指数的大小主要取决于发病时间和发病速度这两个因素，这两个因素在不同年份表现相对稳定；品种间这两个因素存在显著差异。受发病时间和发病速度的影响，不同生长阶段品种间感病程度发生相应变化。在抗病育种中，发病时间晚和发病速度慢的品种（系）是较为理想的抗病亲本。

关键词: 棉花, 黄萎病, 发病时间, 发病速度

Abstract: 21 upland cotton varieties were used to analysis the influence of cotton verticillium wilt on lint yield and the main factors affecting disease index.The result indicated that the higher disease index a variety was,the larger loss of lint yield it had.The disease index depended on mainly both the diseased time and disease developing speed.There was statistical significance of the diseased time and the disease developing speed among varieties.These two factors were stable in different years.The disease indexes of varieties were varying with growth because of the diseased time and the disease developing speed.The variety of cotton with the later diseased time and the lower disease developing speed was the ideal parent material of disease-resisted breeding.

Key words: Cotton, Verticillium wilt, Diseased time, Disease developing speed

中图分类号: 

• S435.621