Abstract: To counter the compound damage by multi-pests in the cotton-producing area of central Yangtze River banks, a compound damage system of six species of pests with three combinations was designed.The damage of multi-pests on cotton and their interactive effect were quantitatively described by path analysis.The analysis for direct and indirect effects of multi-pests on cotton yield and its quality indicated that the interaction of pests on the damage of cotton plants was positive or negative.On the basis of these, the dynamic control indicators of compound damage for two red pests (Pectinophora gossypiella and Tetranychus cinnabarinus) were formulated, which were demonstrated to have notable economic, ecological and social benefits by experiment and expansion.

Key words: Cotton field ecosystem, Multi pest, Compound damage, Interactive effect, Compound control indicator, soybean, heavy material cadmium, transcriptome