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INFLUENCE OF SUBLETHAL EFFECTS OF INSECTICIDES ON THE POPULATION DYNAMICS OF PLUTELLA XYWSTELLA AND ITS PARASITOID DIADEGMA EUCEROPHAGA IN THE FIELD

Abstract The larvae of Plutella xylostella feeding on cabbage plants treated by insecticides, nomolt (25 ×10‐6 and cypermethrin (20× 10‐6 were exposed to their parasitoid, Diadegma euerophaga in the field. The life table technique and the control efficiency (CE) were used to evaluate the sublethal effects of insecticides on the population dynamics of P. xylostella and D. euerophaga. The results showed that the CEs of nomolt and cypermethrin on D. eucerophaga were bigger than that on P. xylostella. Nomolt had a profound effects on D. eucerophaga by the food chain.