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棉花红铃虫在不同处所的越冬比例,据1951年在南京、浏何两地考查结果,每公斤棉籽内有越冬红铃虫10.6—17.6头,占越冬总虫数13.9％。由於各地棉区条件不同,或因气候变化的差异,棉籽内红铃虫常有增减,越冬比例并不固定。目前,棉籽榨油工业,多半是就地取材就地加工,榨油用的棉籽,转移距离、流动方向、加工时间都有一定范围,棉籽内的越冬红铃虫也因此受到了限制,活动面不大。最引人注意的是充作播种材料的棉种;在交换品种或推广良种时,借人为的力量,随棉种转移,传至各地,
Overwintering proportion of cotton bollworm in different places, according to the results of the test conducted in Nanjing and Liuhe in 1951, there were 10.6 to 17.6 overwintering pink bollworms per kilogram of cottonseed, accounting for 13.9% of the total number of overwintering insects. Due to the different conditions of the cotton area around the world, or because of the differences in climate change, pink bollworm often increases or decreases in cottonseed, the proportion of overwintering is not fixed. At present, most of the cottonseed oil extraction industry is locally processed on the spot and the cottonseed used for oil extraction has a certain range of migration distance, flow direction and processing time. Therefore, the overwintering pink bollworm in cottonseed is also limited, Not big. The most notable is the cotton seed, which is used as sowing material. When exchanging varieties or promoting elite, by artificial force,