Comparison of Garlic and Lemon grass Products
in the Control of Callosobruchus maculatus F. (Coleoptera: Bruchidae) on Stored Cowpea Grains

A.M. OPARAEKE and M.C. DIKE

ABSTRACT
Powders of garlic (Allium sativum L.) bulb and lemon grass (Cymbopogon citratus Staph) stem were compared for their effectiveness against Callosobruchus maculatus F. on cowpea stored for three months. Garlic bulb powder at 2.5g, 5.0g and 10.0g per 100g cowpea grains gave 8.33%, 23.33%, 45.0% adult weevil mortality respectively in 24 hours;
50.0%, 56.66%, 75.0% adult weevil mortality respectively in 48 hours; while lemon grass stem powder of the same dosage caused 26.65%, 33.33%i
35.0% weevil mortality respectively in 24 hours and 56.65%, 66.66%, 68.33% mortality respectively in 48 hours. Garlic bulb and lemon grass stem powders significantly (P < 0.01) reduced the oviposition and
progeny emergence in all the treatment levels, compared with the control. However, lemon grass stem powders performed better than garlic bulb powder in F2 and F3 proqenies control and had better protection of cowpea grains. Seed viability and quality were unaffected by the treatments.

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