Abstract: The ability of Rhyzopertha dominica (F.), to reproduce on different host-grains was studied. The number of F1 adults emerged on wheat (551 per 5 pairs) was significantly higher than that emerged on maize (121 per 5 pairs). The beetles did not reproduce at all on groundnut. The mean weight of beetles emerged on maize (61.43 mg per 50 beetles) was significantly greater than those emerged on wheat (60.64 mg per beetles). It is suggested that amongst different host-grains used in these studies, wheat is the most productive host, maize is a suitable host and groundnut is a non-host for this particular strain of R. dominica.