2008•Indian journal of plant protectionOpen access

Insecticide Resistance in Cotton Aphid, Aphis gossypii

P. S. Senthil Kumar, T. Madhumathi, V. Ramasubba Rao, V Srinivasa Rao

Abstract

The study on insecticide resistance in cotton aphid, Aphis gossypii during Kharif, 2005 to five commonly used insecticides in cotton ecosystem, viz., monocrotophos, acephate, dimethoate, phosphamidon and triazophos revealed a shift in the level of susceptibility to these insecticides. The LC50 and LC90 values were increased 121.50, 20.00, 9.61, 7.96, 2.38 and 7.68, 3.84, 1.66, 0.60, 0.46 folds to the respective insecticides. A comparison of LC90 values with recommended concentrations of test insecticides also revealed that aphid population of Guntur district developed resistance to all the test insecticides.

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Key concepts: Aphis gossypii, Phosphamidon, Acephate, Dimethoate, Aphid, Monocrotophos, Toxicology, Kharif crop