Evaluation of Different Wheat Genotypes Against Rice Weevil (Sitophilus Oryzae (L.) (Coleopteran: Curculionidae)

Abstract

An experiment was conducted using twelve different wheat genotypes to determine their resistance to Sitophilus oryzae (L.) at Agriculture Research Institute Tarnab, Peshawar during the year 2013. The experiment was laid out in Completely Randomized Design (CRD) with three replications in a control temperature of 29±2?c with 60±65% relative humidity. A sample of 100 gm of wheat grains were kept in a plastic jar of 240 gm capacity. Six pairs of newly emerged adults of S. oryzae of uniform age from laboratory stocked culture were released in each jar. Results were evaluated on the basis of percent weight loss, percent grains damaged, adult population and proximate composition of wheat grains against the infestation of S. oryzae. Among all the genotypes percent weight loss (6.21%), percent grains damaged (5.32%) and adult population (82) were found lowest in A2-92 and was found to be comparatively the most resistant genotype, while the highest adult population (145), percent weight loss (16.99%)  and percent damaged grains (9.53%)  were recorded in genotype A2-95 and was found the most susceptible genotype against the infestation of pest, while the other genotypes were intermediate in response to the pest attack.

Keywords: Wheat, Sitophilus oryzae (L.), weight loss, grains damaged, adult population