Selection for Resistance to Deltamethrin in Red-Flour Beetle, Tribolium castaneum (Herbst)

Deltamethrin resistant strain of Tribolium castaneum was obtained in six generations, when pest population collected from godowns of Food Corporation of India, was exposed to 70% selection pressure of deltamethrin in each successive generation in insecticide-charged flour medium. Starting with 5 ppm concentration of detlamethrin in wheat flour medium for first progeny, the concentrations of insecticide for successive generations were increased subsequently, reaching a level of 200 ppm for the six genenition. The level of deltamethrin resistance in T. castaneum after six generations of selection was 78.6 folds.