Monodora myristica (Gaertn) Dunal (Myristicaceae) and Allium cepa L (Liliaceae) as Protectants Against Cowpea Seed Bruchid, Callosobruchus maculatus (F.) Infesting Stored Cowpea Seeds.
OPARAEKE, A. M. and DIKE, M. C.
African nutmeg [Monodora myristica (Gaertn) Dunal] and onion (Allium cepa L.) bulb powders were compared for their efficacies against stored cowpea bruchid, Callosobruchus maculatus (F.). Seed powder of African nutmeg at concentration of 6.0 g per 100 g grains of cowpea caused 16.7 %, 33.3 % and 60.0 % mortality of adult bruchid in 1, 2 and 3 days respectively, compared to 20.0 %, 46.7 % and 80.0 % mortality of adult bruchid with onion bulb powder. Powders of African nut-meg and onion bulb
significantly (P< 0.05) reduced both oviposition and progeny development (F1) at all treatment levels compared to the control. African nutmeg significantly (P< 0.05) gave better protection to cowpea grains for up to four months of storage than onion bulb powder. Seed quality (colour and taste) and viability (90 and 100 %) were largely unaffected at higher concentrations of African nutmeg powder used in the study.