Efficacy of Candlewood Zanthoxylum xanthoxyloides (Lam.) for the control of Sitophilus zeamais (Mots.) (Coleoptera: Curculionidae) and Callosobruchus maculatus F. (Coleoptera: Bruchidae)

The bioactivity of dried leaves, bark and root of Zanthoxylum xanthoxyloides (Lam.) was assessed in the laboratory for their ability to protect stored grains from damage by Sitophilus zeamais and Callosobruchus maculatus on maize and cowpea, respectively. One hundred grams of sterilized grains were measured in glass jars and the ground plant materials added as direct admixtures to test for toxicity, progeny production and weight loss. The plant materials tested initially at a concentration of 5% (wt/wt) showed the root and bark inducing 100% mortality and causing significant (