Susceptibility of Chilo partellus (Swinhoe) populations to insecticides Tanwar Aditya Kumar1,*, Jindal Jwala, Brar Dulcha Singh2 1Department of Entomology, Punjab Agricultural University, Ludhiana, 141004 2Department of Plant Breeding and Genetics, Punjab Agricultural University, Ludhiana, 141004 *Email: tanwar.aditya88@gmail.com
Online published on 12 June, 2017. Abstract The experiment was conducted to generate the information on the relative susceptibility of 3rd instar larvae of three populations of Chilo partellus (Swinhoe), reared for 8 (P1), 3 (P2) and 1 (P3) generations under laboratory conditions to the recommended insecticide i.e. Decis 2.8 EC (deltamethrin) and the Bt formulation, Dipel 8L (Bacillus thuringiensis var. kurstaki strain HD-1). On the basis of LC50 values, the order of susceptibility of all the populations to Decis 2.8 EC and Dipel 8L was P1> P2> P3. The LC50 for Decis 2.8 EC and Dipel 8L after an exposure of 48 hours, was highest in P3 (0.00047% and 0.00796%) while for P2, it was comparatively lower (0.00031% and 0.00605%) and for P1 lowest (0.00005% and 0.00181%). The increased susceptibility of continuously laboratory reared populations reported herein might perhaps be due to deleterious genetic effects or inbreeding depression that occurred over generations. Top Keywords Chilo partellus, laboratory rearing, generations, Decis 2.8 EC, Dipel 8L, LC50, increase in susceptibility. Top |