Toxicity Of Some Plant Powders To Callosobruchus maculatus (Fab.) On Stored Cowpea



Powders of black currant (Ribes nigrum Linn.), breadfruit (Treculia africana Decne) seeds, clove (Syzygium aromaticum Gaertn) inflorescence and Artemisia maciverae Hutch and Dalz. plants applied at 2.5 and 5.0 % w/w were evaluated for toxicity against Callosobruchus maculatus Fab. on stored cowpea. Clove powder at 2.5 % and 5.0 % w/w recorded 100 % mortality of adults of C. maculatus compared with 53.3 and 60 % mortality of adult C. maculatus on cowpea treated with pirimiphos methyl dust at 1.0 % and 2.0 % in 48 h. Clove powder depressed oviposition and reduced the emergence of Fl and F2 offspring, and gave protection to cowpea grains for up to 120 days of storage and seed viability was as high as 87.7 %. Clove powder proved significantly more effective compared to pirimiphos methyl dust and other tested plant powders.

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