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1981年4月,由江苏省植保站牵头,和泗阳、大丰、高邮、南通、滨海县植保站组成了江苏省棉铃虫危害损失和防治指标研究协作组。通过1981～1985年的系统研究,棉铃虫危害棉花随虫量的增加被害量加大,棉花具有耐害性和补偿能力,花蕾自然脱落数和危害后脱落率随虫量的增加而减少。棉花补偿作用低于危害程度时,造成产量损失。用协方差分析,求得虫量与损失率的共用方差为二代y=0.0992x~(1.2051),三代y=0.03344x~(0.0991),四代y=0.452x~(0.844)。
April 1981, led by the plant protection station in Jiangsu Province, and Siyang, Dafeng, Gaoyou, Nantong, Binhai County plant protection station formed a cotton bollworm in Jiangsu Province endanger the loss and prevention and control of indicators of collaboration group. Through the systematic research from 1981 to 1985, cotton bollworm endangered cotton increased with the amount of insect damage increased, cotton has resistance and compensatory ability, the number of natural buds and the loss rate of endangering decreased with the increase of insects. Cotton compensation role below the degree of harm, resulting in loss of production. The covariance analysis showed that the common variances of worm mass and loss rate were y = 0.0992x ~ (1.2051), y = 0.03344x ~ (0.0991) and y = 0.452x ~ (0.844) for the second generation.