The interaction between the predatory natural enemies and cotton bollworm was studied in caged conditions.The dominant natural enemy species were O.similis,L.axyridis,P.japonica, on the stage of egg,O.similis,P.japonica,L.axyridis,D.fimbriatoides, on the stage of 1~2 instar,Misumenopos tricuspidata,P.japonica,L.axyridis,D.fimbriatoides,on the stage of 3~6 instar.Each species and cotton bollworm(Helicoverpa armigera) were tested in their coexistent systems in caged cotton field.The interaction were analysed ...