Phytochemical compositions and insecticidal efficacy of four agro-waste used as biological control of cowpea beetle, Callosobruchus maculatus (Fab.) [Coleoptera: Bruchidae]

Abstract Background The cowpea bruchid, Callosobruchus maculatus is the major postharvest insect pest of seeds in storage. This had led to huge losses and quality deterioration stored that serve as poor man’s meat lieu expensive source developing countries. research was carried out evaluate bioefficacy rice husk, maize cob, groundnut, pods against C. laboratory. Adult mortality, eggs laid, adult emergence, damaged seeds, weight loss beetle perforation index (BPI) were evaluated. Phytochemicals wastes investigated. Results result showed agricultural contained alkaloids (1.56–2.77 mg/g), saponin (1.51–3.38 phytate (7.00–17.76 oxalate (0.32–1.13 mg/g). All a high mortality effect on , their effects increased exposure time concentration/ dosage increased. Beetle highest pod with 80% for powder after 3 4 days when applied at 0.5 g/20 g seed. has greatest insecticidal activity while least observed cob (73.33%). Fewer adults emerged having emergence 0.2–0.5 dosage. Extracts all tested able affect 70–100% application concentration ml extract causing 100% application. calculated lethal dose (LD 50 LD 90 ) concentrations (LC LC powders extracts have lowest across period exposure. Conclusion Base results obtained, waste most toxic biocontrol .