Samples of soft winter wheat containing eggs, larvae, pupae, or adults of Rhyzopertha dominica (F.) were given one of the following treatments: 1) Gamma radiation; 2) infra-red radiation; 3) microwave radiation; 4) gamma + infra-red; or 5) gamma + microwave. The percentage of adult emergence from treated immatures or the mortality and fecundity of treated adults provided a basis for evaluating the effectiveness of the treatments. The average reductions in emergence were 54, 55 and 42 per cent for gamma, infra-red, and microwave treatments, respectively. The reductions in emergence averaged 99 per cent for the gamma + infra- red combination and 96 per cent for the gamma + microwave combination. These mortalities were about 20 per cent higher than predicted. Adult mortality data were inconclusive because of the very low gamma dosage used. However, reductions in adult fecundity for the above combinations were about 95 and 89 per cent, respectively. These were about 22 and 9 per cent greater than the predicted reductions in fecundity.