棉花品种对黄萎病慢病性初步研究

2002-2003年在河南省新乡县李台基地重病田,通过定株定时调查发病情况和各单株的产量结构,研究了不同抗病性棉花品种对黄萎病慢萎性。结果表明,若单纯以8月下旬的病情指数为标准,不少品种的抗病性均不理想,但从黄萎病发展历程分析,则发现有一部分耐至感病品种,其病情发展缓慢,对产量的影响也达不到显著水平。为此,提出棉花品种存在对黄萎病的慢病性,简称棉花品种慢萎性。

Studies on Cotton Cultivars Slower Verticillium Wilt

The cotton cultivars slower Verticillium wilt had been studied through selected cotton plants of different cultivars in Verticillium infected field during the cotton growing period in Litai, experiment station of Xinxiang county, Henan province The cotton plants Verticillium wilt variance and their production construction were studied. The results showed that the disease development was slower and there was less influence on production in some cultivars of tolerant or susceptive to Verticillium wilt, for example, tolerant cultivars CCRI 12, BD18, GK19,33B and some susceptive cultivars, 86-1, sGK321. In these cultivars the disease development was slower, and the early diseased plants were did not die, and their growth were less influenced, the plants were high, branches and bolls per plant were different to the health plants, and some heavy disease plants can become light disease plant. In later diseased plants, the production including the plants height , branches and bolls per plant had no difference to the health plants. But some susceptive cultivars, for example Ejing 1, don't have slower disease, When plants of these cultivars were infected by Verticillium dahliae in early, they would quickly die, and the production were greatly influenced, all the leaves, flowers, bolls were flew. So we think there are slower disease in cotton Verticillium wilt, we named that cotton slower wilt.