Studies were conducted at the ICRISAT Sahelian Centre, Niger, to assess damage and yield loss by the millet stemborer, C. ignefusalis on Pennisetum glaucum. Although 78% of stems were infested, late attack by the millet stemborer on millet plants resulted in bored stems yielding more than unbored ones. Artificial infestations with 5 and 10 larvae per plant at 2 weeks after plant emergence resulted in 50-70% plants with deadhearts and 24-100% avoidable yield loss. At 4 weeks after plant emergence, infestations with 5 and 10 larvae per plant resulted in 7% yield increase and 16% yield loss, respectively. Therefore, both the age of plant and density of borer population at the time of infestation can influence the resulting stemborer damage and yield loss on pearl millet.