Callosobruchus maculatus is a common pest of cowpea. This insect is known as the cowpea weevil and it is a major pest of stored cowpea grains. The adult weevils lay their eggs on the cowpea grains and the hatched larvae bore into the grains, feed on them and cause damage, making the grains unfit for consumption or seed purposes. Therefore, proper storage practices and control measures are necessary to prevent or minimize losses due to this pest.