Varietal Susceptibility of Wheat Grains against Rice Weevil, Sitophilus oryzae L.

The study on susceptibility of different wheat varieties against rice weevil, Sitophilus oryzae were carried out at Department of Entomology, N. M. College of Agriculture, NAU, Navsari during 2011–12 and 2012–13. The seven wheat varieties (LOK1, GW11, GW 173, GW322, GW 366, GW496, HD 2189) were tested to study resistance on the basis of biological parameters and biochemical content against infestation of S. oryzae. Results revealed that, based on oviposition preference by free choice test and adult emergence test revealed that the varieties viz., GW 496, GW 11 and GW 322 were less susceptible to S. oryzae while, GW 173, GW 366 and LOK 1 were existed under moderately susceptible whereas, the only variety HD 2189 was found to be highly susceptible. Moreover, the categorization on basis of oviposition preference by confinement test, life cycle duration, per cent grain damage and per cent weight loss revealed that varieties viz., GW 496, GW 11, GW 322 and GW 173 were less susceptible; while GW 366 and LOK 1 were moderately susceptible and HD 2189 was again found to be highly susceptible.