eggs were the most susceptible to the microwave energy followed by larval, adults and the least susceptible was the pupal. This may be due to the eggs being more directly exposed to microwave heating.While, larval and pupal stages being internal to the pulses seeds, were more insulated from the heat, experiencing a shorter exposure to lethal temperatures.These results are in agreement with those of Vadivambal et al., (2010) who used microwave energy at power level of 300, 400, 500 and 600W to kill larval and adult stages of stored grain insects and reported that complete mortality was obtained at 500W for 14s or at 400W for 28s.This result is also comparable to the results obtained by Johnson et al., (2011).