由于沿江棉区棉铃虫连年偏重发生和 2000年度棉花市场价格抬升等因素的影响,2001年沿江棉区棉花种植面积呈大幅上升的趋势,其中,抗虫棉不仅种植面积大,栽培品种多而杂,而且在生产中大多数抗虫棉品种成铃率偏低,丰产性差。为此,对多个抗虫棉品种进行了系统的调查研究,以探索成铃偏低的原因与栽培对策。1主要表现1.1空果枝比例偏高。据对2个保铃棉品种（保铃棉32B和保铃棉109）、2个国抗品种（国抗22和W-8564）和1个国抗杂交组合（皖抗杂二号）的系统调查结果,2001年抗虫棉单株空果枝数一般为3.7～4.6台,占单株总果枝数的21.51％～26.74％,其中空果枝主要集中在中下部第二至第八台果枝,平 Due to the continuous occurrence of cotton bollworm in the Yangtze River Delta and the price rise of the cotton market in 2000, the planting area of ​​cotton in the Yanjiang cotton area increased sharply in 2001. Among them, the cotton planting area was not only large but the cultivars were varied , But also in the production of most insect-resistant cotton boll rate is low, poor yield. To this end, a number of insect-resistant cotton varieties were systematically investigated to explore the causes of low bells and cultivation strategies. 1 The main performance 1.1 The high proportion of empty fruit branches. Two systems of cotton bollworm (boll boll 32B and boll boll 109), two resistant varieties (guoqiu 22 and W-8564) and one guozheng hybrid (Anhui Kangzuo 2) The results showed that in 2001, the number of bare fruit per plant was generally 3.7-4.6, accounting for 21.51% -26.74% of the total number of fruit per plant. The hollow fruits were mainly concentrated in the second to the eighth fruit branches