The contact action of triflumuron (TFM) and diflubenzuron (DFB) on development and survivability of Tribolium castaneum
(Herbst) were studied. The mean developmental period was recorded in different concentrations of both BPUs. Lower percentage
of hatching was recorded on TFM compared to DFB and control. TFM was more effective than DFB on the survivability of different
life stages. TFM at 0.05ppm provided the highest duration (49 days) of developmental period, and the lowest duration was 32.33
days (near to control) in DFB at 0.005ppm. Percent reduction of adult emergence was highest in 0.1TFM as 85.95 and at 0.05 DFB
as 62. 50.