The control ofCallosobruchus maculatus(F.) in stored cowpea with dried groundRicinus communis(L.) leaves in Nigeria

One to five grams of dry ground castor leaves, Ricinus communis mixed with 300 g cowpea seeds, achieved mortality up to 100% in 7 days. After 48 h only 20% mortality was recorded with 5 g. The grains were protected from damage for more than 3 months. However, little energy was involved in collecting, drying and grinding sufficient quantities of leaves required for the experiment.