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The efficacy of clay, Jatrophacurcas (L.) seed oil and palm oil in the control of cowpea bruchid, Callosobruchus maculatus (F.) on stored cowpea was studied in the laboratory of the College of Crop and Soil Sciences of Michael Okpara University of Agriculture, Umudike. Five pairs of male and female C. maculatus (1-2 days old) were introduced into each experimental unit of 250ml plastic vials containing 20 grams cowpea seeds of Ife Brown cultivar, which had been thoroughly admixed with formulations of clay, J. curcas seed oil and palm oil. These formulations and a synthetic insecticide permethrin dust (0.6%) were applied at the rates of 0g (control), 0.1g, 0.2g, 0.3g, 0.4g, 0.5g and replicated three times. This experiment was laid out in a Completely Randomized Design (CRD) and data were collected on the percentage adult mortality at 24 hours, 48 hours, 5 days, and 7 days post infestation, oviposition, and adult emergence of C. maculates and percentage seed germination after three months of storage. The results obtained showed that all the treatments had significantly higher adult mortality (P≤0.05) than the control, significant lower oviposition and adult emergence with higher seed germination. Applications of these formulations at 0.4g and 0.5g per 20g of cowpea seeds were not significantly different (P≤0.05). Clay at all levels had a higher efficacy than the synthetic insecticide (P≤0.05). Therefore clay at the rate of 20g per kilogram of Cowpea could be recommended for use in the control of cowpea storage pest C. maculatus.
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