INSECTICIDE RESISTANCE IN THE COTTON APHID, Aphis gossypii GLOVER IN EGYPT
نویسنده
چکیده
The cotton aphid, Aphis gossypii Glover (Hemiptera Aphididae), is one of the most important sap sucking pests in many cotton-growing areas world-wide. In this study, the efficacies of seven insecticides [organophosphate (Fenitrothion & Pirimiphos-methyl), carbamate (Carbosulfan & Aldicarb), pyrethroid (Lambda-Cyhalothrin & Deltamethrin) and imidaclopride (Confidor)] were determined against four strains of Aphis gossypii (Glover) collected from four Governorates in Egypt [Damytta (DAM), Dakahlia (DAK), Qaliobia (QAL) and Giza (GIZ)]. Collected strains were bioassayed and compared with a reference susceptible strain. QAL and DAM strains demonstrated 8.64 and 6.11-fold resistance, respectively to fenitrothion and also demonstrated 14.4 and 8.84-fold resistance, respectively to pirimiphos-methyl. QAL and DAM strains recorded 14.6 and 3.11-fold resistance, respectively to lambda-cyhalothrin while DAK and DAM strains recorded 11.49 and 5.71-fold resistance, respectively to deltamethrin. QAL and DAK strains demonstrating 27.7 and 10.05-fold resistance, respectively to carbosulfan and also demonstrated 18.3 and 8.57-fold resistance, respectively to aldicarb, while QAL and DAM strains recorded 32.55 and 1.82-fold resistance, respectively to confidor. These results are discussed in relation to the possible mechanisms of resistance present in the studied A. gossypii strains and underpin the resistance management strategy for aphids in Egypt.
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