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棉花受病虫为害后,对产量的影响很大,但损失的程度究竟有多少,以往未搞过这方面的调查研究,说不出一个确切的数据,为了搞清棉花病虫为害的程度和产量的损失,一九八○至一九八三年我们在小港公社北港大队和荣塘棉种场进行了这项试验,现将结果初报如下: 一、试验概况在条件基本一致的棉田内,进行打药与不打药对比试验,面积7亩半,其中打药棉田4亩,不打药棉田3亩半。打药区按棉区一般用药水平在主要棉虫为害期共施化学农药8至12次,不打药区不施任何农药。品种为岱字15号、沪棉204,二个处理田间管理
Cotton affected by pests and diseases, the impact on the yield a great deal, but the extent of the extent of the loss, in the past did not engage in research in this area, can not tell an exact data, in order to find out the extent of cotton pests and The production loss, we from 1980 to 1983 at the North Harbor Brigade and Rongtang Cotton Seedling field of this trial, the results are as follows: First, the test profile In the same basic conditions within the cotton field , To fight drugs and do not fight drugs contrast test, an area of 7 acres and a half, of which 4 acres of cotton fight drugs, cotton fields do not play 3 acres and a half. In the area hit by cotton, the average dosage of pesticide in the area hit by chemical pesticides is 8 to 12 times during the damage of the main cotton insects. Variety Dai No. 15, Shanghai Cotton 204, two field management