Mbata_etal2009 JournalArticle 2009 Journal of Stored Products Research 45 4 232-235 MbataG.N. PhillipsT.W. PaytonM.E. Effects of cowpea varietal susceptibility and low pressure on the mortality of life stages of _Callosobruchus maculatus_ (Coleoptera: Bruchidae) Journal of Stored Products Research