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针对长江中游棉区棉花多虫复合危害问题，设计了６种害虫４种组合的复合危害系统．运用通径分析方法，定量描述了多种害虫对棉花的侵害及其间的互作效应．通过多种害虫对棉花产量和品级的直接影响效应和间接影响效应分析，认为当多虫复合危害时，害虫间的相互作用就其对作物的侵害而言，表现为增强效应和减弱效应．在此基础上，研究并制定了“两红”（棉红铃虫和朱砂叶螨）复合危害动态防治指标，经验证、示范及推广应用，取得了显著的经济、生态和社会效益．
Aiming at the complex damage of cotton bug in the middle reaches of the Yangtze River, a composite hazard system of 6 kinds of pests was designed. Using the path analysis method, quantitative description of the damage caused by various pests to cotton and the interaction between them. Through the direct and indirect effects of various pests on the yield and quality of cotton, it is considered that the interactions between pests and insects play an increasing role and a weakened effect in terms of their damage to crops. On this basis, the dynamic control index of “two reds” (Helicoverpa armigera and Tetranychus cinnabarinus) is studied and formulated. After validating, demonstrating and popularizing the application, remarkable economic, ecological and social benefits have been achieved.