Abstract: Background and Objective: Post-harvest losses and damage caused by Callosobruchus maculatus in storage serves as a constraint to cowpea production in most developing Nations. The objective of the study was to evaluate the potentials of polypropylene sheets in trapping solar heat for the management of the cowpea bruchid. Materials and Methods: Polypropylene sheets (black, blue, yellow, green and transparent) containing 100 g of cowpea seeds with control (open seeds) was exposed to solar radiation for 2, 4, 6 and 8 h. Temperature inside the sheets was measured and recorded at 30 min’ intervals for each treatments and replicates. Consequently, further experiment was conducted to investigate the effects of solar heat trapped by the polypropylene sheets against the cowpea bruchid. Data was collected on adult mortality and subjected to a two-way analysis of variance using JMP 13 Computer Software. Results: Findings of the study revealed significant difference in the temperature trapped by the varying coloured sheets at different exposure periods. Black and transparent polypropylene sheets recorded the highest amount of temperature trapped (52.88°C) among the colours evaluated. Furthermore, the results of the study showed that solar heat had significant (P0.05) effect on C. maculatus causing mortality at different exposure periods. Conclusion: The technique had great potential in managing C. maculatus, since the highest amount of heat trapped in the polypropylene sheets is sufficiently lethal to all developmental stages stored insect pest.