Bio-insecticidal and Grain Protectant Activities of Mixed Powder of Ocimum gratissimum and Vernonia amydalina against Callosobruchus maculatus (Coleoptera: Bruchidae) - Nta, A. I.; Agbo, B. E.; Udoekong, N. S. (Recent Advances in Biological Research Vol. 1, 2019)