author(s)
Tagne Gabriel Fotso, Elias Nchiwan Nukenine, Rigobert Tchameni, Jean Wini Goudoungou, Daniel Kosini, Vandi Tigamba and Cornel Adler

abstract
Biological investigations were conducted at the laboratory of Applied Zoology, University of Ngaoundere, Adamawa Region between August 2016 to March 2017. The aim of this research was to evaluate the insecticidal and protectant efficacy of Cameroonian Hemizygia welwitschii leaf powder against Callosobruchus maculatus and Sitophilus Zeamais and germination ability of treated seeds. Cowpea or maize were admixed with the plant powder at the rates of 5, 10, 20 and 40 g/kg and commercial SilicoSec at 0.5, 1, 1.5 and 2 g/kg grains. At 40 g/kg, H. welwitschii caused to C. maculatus (82.50%) and S. zeamais (81.25%) adults similar mortality at 7 and 14 days after exposure respectively, while the mortality caused by SilicoSec at 2 g/kg was 100% for the both insects. Furthermore, significant reductions of insect growth and grain damage were recorded. Seed’s ability to germinate was not affected by the product at the term of storage. Our findings revealed the insecticidal potential of H. welwitschii powder against C. maculatus and S. zeamais.