Residual Effect of Certain Insecticides Against Different Strains of Peach Aphid on Pepper

Green peach aphid was collected from Madaba and Deir-Alla as two field strains. The sensitive strain was collected from far-away valleys in Um-Al-Ammed on the wild mustard, and then it was reared in the greenhouse in the University of Jordan for ten generations. The pepper plants were used in the residual effect experiments. Survived aphids after treatment separately l with LC50 of Calypso, Karate, Evesict and Dimethoate for the three strains were observed and monitored to find the residues effect of these pesticides and on the aphid offsprings. Number of aphids were decreased within two weeks after treatment with Calypso in the three strains, and then aphid population remained constant until the end of the experiment. A number of aphids were decreased within two weeks after treatment separately with Karate, Evesict and Dimethoate in the three strains, and then aphid population increased until the end of the experiment.