Evaluation of different wheat germplasms against rice weevil Sitophilus oryzae (L.)

Thirty wheat germplasms were tested against Sitophilus oryzae (L.) and NW-6056, DPW-62150 and BRBW-3759 were found highly susceptible to S. oryzae on the basis of percentage of grain damage, percent weight loss and population build up. DBW-39 was found to be leaft susceptible one. The results revealed that percentage of grain damage, percentage of weight loss and population build up caused by Sitophilus oryzae was more in summer season as compared to the winter season. From the present studies it is evident that percentage of grain damaged and percentage of weight loss kept on increasing from first day of observation (i.e., 7 days after exposure of grain to Sitophilus oryzae). The percentage of grain damaged and percentage of weight loss due to Sitophilus oryzae was found to be the highest on the 56^th day of experiment. The loss due to grain damage was found to be 29.17 and 17.36% and loss in weight was estimated at 25.07 and 15.54% during the summer and winter seasons, respectively.