The exposure of gravid female T. castaneum beetles to sublethal i concentrations (LC10, C20 and LC30) of different treatments for 24 h resulted in reduced fecundity The average fecundity i of the beetle in control group was recorded as 4.7 eggslfemale. a In all the treatments the fecundity was reduced and it was di- rectly proportional to the concentrations tested. Benzalde- a hyde propionic acid combination recorded the lowest fecundity at LC10 (2.44 eggs/female), LC20 (1.32 eggs/female) i and LC30 (0.8 eggs/female) concentrations Table 3). Benzalde- hyde individual treatment was also found to be effective; this treatment recorded 2.76, 1.38 and 0.92 eggs/female insect at a the LC LC20 and LC30 concentrations, respectively, in 24 h 10