author(s)
Naima Din, Misbah Ashraf, Shahbaz Hussain, Zafar Iqbal and Dilbar Hussain

abstract
Experiment was conducted in Stored Grain Laboratory, Entomological Research Institute, Faisalabad during 2015-16. Under laboratory conditions, five wheat varieties viz., Pasban-90, Shafaq-06, Sehar-06, Faisalabad-08 and Lasani-08 were tested against Tribolium castaneum to evaluate the feeding preference and biology of T. castaneum. Maximum no. of eggs was observed in Sehar-06 i.e. 250.67 followed by Pasban-90, Shafaq-06, Lasani-08 and Faisalabad-08 i.e. 211, 201.67, 199 and 190.33 respectively. As for as development time was concerned maximum development time was observed in Faisalabad-08. Development time of T. castaneum in different wheat varieties was Faisalabad-08 (53.01 days), Lasani-08 (45.32 days), Pasban-90 (42.34 days), Shafaq-06 (37.54 days) and Sehar-06 (33.70 days). Biotic potential of T. castaneum in different wheat varieties were Sehar-06(0.0712), Shafaq-06(0.0614), Pasban-90(0.0549), Lasani-08 (0.0507) and Faisalabad-08(0.0430). Intrinsic rate of Increase of T. castaneum in different wheat varieties were Sehar-06 (0.1070), Shafaq-06(0.1032), Pasban-90(0.0989), Lasani-08 (0.08656) and Faisalabad-08(0.07952). was observed.