The present research was conducted to evaluate the efficacy of Plumeriarubra products on bruchid beetles (Callosobruchusmaculatus (F)) during storage. A synthetic insecticide, Pirimiphos methyl and four Plumeriarubraproducts (leaf, stem bark, root bark and flower) powders were tested on cowpea (Vignaunguiculata) seeds infested with teneral adults of Callosobruchusmaculatus in a completely randomized design. Data were collected on mean number of eggs laid, mean eclosion, mean number of emerged adults, and mortality of insects at different treatments. The results obtained revealed significant (P ≤ 0.05) differences in the mean oviposition rate, mean eclosion and total developmental period of the insects treated with different products of Plumeriarubra. The highest number of eggs oviposited and ecloded were 85.4 and 81. 6 respectively, which were significantly different when compared with the values of 43.2 and 40.2 obtained when the root bark powder was applied. The total developmental period obtained for the cowpea weevils ranged from 16 – 23 days. No plant product matched the efficacy of Pirimiphos-methyl; however, the powder of Plumeriarubra flower showed good potential as insecticide for the control of cowpea weevil (Callosobruchusmaculatus) on cowpea (Vignaunguiculata) during storage.