The Effect of Some Biorational Insecticides on Cotton Aphid (Aphis Gossypii) in Laboratory and Greenhouse Conditions

Aphis gossypii is one of the most important pests of vegetables especially green house cucumber. In this study, the sensitivity of mature aphids in laboratory and also nymph and matured insect in green house was evaluated. Sensitivity was measured against buprofezin, pyriproxyfen, flufenoxuron, azadirachtin, and pymetrozine. Bioassay method was spraying pesticide on insects. In green house, mentioned insecticides were used as five treatments of a completely randomized design (500, 100, 60, 44 and 2500 ppm, respectively) with three replications. Each experimental unit had three pots of same age plants of cucumber. In bioassay method, LC50 of insecticides were determined as 23.88, 55.43, 48.41, and 2.9 ppm, respectively for buprofezin, pyriproxyfen, flufenoxuron, azadirachtin, and pymetrozine. The highest and the least mortality of nymphs were belonging to pymetrozine (95.78%) and burprofezin (55.05%). For matured insects, these amounts were pymetrozine (94.94%) and pyriproxyfen (56.41%). According to results, using pymetrozine in green house will control Cotton aphid.