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在纱笼隔离下的盆栽试验表明，受密度效应的影响，棉蚜种群的增长为Ｓ形的逻辑斯谛曲线。使用氰戊菊酯，促进了棉蚜的繁殖，种群高速增殖的惯性使棉蚜种群在一定时间内突破了密度效应对种群增长的抑制而呈指数形增长；氰戊菊酯还促进棉花生长，使棉蚜比对照有更多的空间和食物满足种群增长的需要。小区试验表明，对照棉蚜受包括天敌在内的广义密度效应的影响，种群仍按Ｓ形增长，氰戊菊酯大量杀死天敌，氰戊菊酯小区的棉蚜失去了天敌的控制，形成与隔离条件下相似的情况，种群仍为指数形增长。同时，氰戊菊酯有效地控制了棉叶螨，使棉蚜在种间竞争中顺利地淘汰了棉叶螨而成为优势种。氰戊菊酯使得整个棉田生态有利于棉蚜而使其再生猖厥。
Pot experiments in sarong cage showed that the population growth of cotton aphid was S-shaped logistic curve under the influence of density effect. The use of fenvalerate to promote the cotton aphid breeding, population inertia of high-speed proliferation of cotton aphid populations over a certain period of time exceeded the density effect of inhibition of population growth and exponential growth; fenvalerate also promote cotton growth, The cotton aphid more space and food than the control to meet the needs of population growth. Community trials showed that the control population of cotton aphids affected by the generalized density effect including natural enemies, the population continued to grow in an S shape and fenvalerate killed a large number of natural enemies. The aphids in the fenvalerate community lost the control of natural enemies to form Similar to the isolation condition, the population is still exponential. At the same time, fenvalerate effectively controlled cotton spider mites, which made cotton aphid eliminate the cotton spider mites in the interspecific competition as the dominant species. Fenvalerate makes the entire cotton ecosystem is conducive to cotton aphid and make its regeneration fester.