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对２个品种在７个不同播期的平作棉与麦套棉进行棉花黄萎病发生规律的研究。结果表明，不同播期的黄萎病发生规律存在着差异，尤其对黄萎病侵染和扩展具有较大的影响。４月３０日，５月７日，５月１４日，５月２１日播种的４个处理，２个品种的黄萎病侵染扩展速度较慢，９月１０日播种的平作棉的黄萎病株率均低于３７５％，麦套棉的病株率均在３７０％以下，６次调查病情指数总和与４月９日，１６日，２３日播种的３个处理相比，达显著水平。不同播期平作棉的黄萎病全年为２个发病高峰，５月份播种的第１个发病高峰推迟，４月３０日播种的发病高峰值较低；４月９日，１６日，２３日播种的麦套棉全年发生３个发病高峰，其它播期为２个发病高峰。
Study on the regularity of occurrence of cotton Verticillium dahliae in two cultivars in seven different sowing dates. The results showed that there were differences in the occurrence of Verticillium wilt at different sowing dates, especially the invasion and expansion of Verticillium wilt. Four treatments of April 30, May 7, May 14 and May 21 sowing, the spread of Verticillium wilt of the two varieties was relatively slow, and the Verticillium dahliae sown on September 10 The diseased plants rate was less than 375%, the rate of diseased plants in wheat bran was below 370%. The sum of disease index in 6 surveys was compared with the three treatments sown on April 9, 16 and 23 , Reaching a significant level. Verticillium wilt at different sowing dates was peaked at 2 incidences throughout the year. The first peak incidence of sowing in May was postponed and the peak incidence of sowing on April 30 was low. On April 9, 16 and 23 Cotton sowing sowing three peak incidence throughout the year, the other sowing two peak incidence.