Response of the apple aphid Aphis citricola van der Goot adults to treatment with several classes of insecticides varied from most toxic (esfenvalerate with LC50 0.89 ppm [AI]) to least toxic (monocrotophos with LC50 385.51 ppm [AI]). Esfenvalerate, which was most toxic to A. citricola, was also most toxic to the aphidophagus coccinellid Harmonia axyridis Pallas. The response of the aphid Myzus I1wlisllctus Matsumura adult to different insecticides varied from highly susceptible (deltamethrin with LC50 0.01 ppm [AI]) to highly tolerant (fenpropathrin with LC50 6.95 ppm [AI]). Esfenvalerate, which was 3rd in the order of toxicityto M. malisucttls, was the most toxiccompound to H. axyridis. Alphamethrin,which showed the lowest selectivityratio, was also much safer to the predator than to the pest. Based on their selectivity ratios, alphamethrin appeared tDbe the most promising candidate fDrIlse in integrated pest management prDgramswhere H. axyridis is the majDrnatural enemy.
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