author(s)
Akinneye JO, Adesina FP and Ogunnote OT

abstract
The insecticidal activities of Cleistopholis patens and Eugenia aromatica (powder and ethanolic extracts) on maize weevil was carried out to determine its efficacy on mortality of Sitophilus zeamais, percentage reduction of the maize weevil, percentage seed damage and Weevil Perforation Index (WPI) as an index of insecticidal activity. Five different levels of concentration were used (0.5g, 1.0g. 1.5g. 2.0g and 2.5g w/w of powder), (0.5ml, 1.0ml,1.5ml, 2.0ml and 2.5ml w/v of ethanolic extracts) and (0.1g, 0.2g, 0.3g, 0.4g and 0.5g w/w of powder) for the percentage reduction, seed damage and WPI. The plant powders and extracts showed significant (p<0.05) level of toxicity to the maize weevil at different exposure periods and concentration. At all levels of concentration using the plant powder no mortality was obtained at 24h exposure period with C. patens. The highest mortality of 46.67% was obtained at 96h with 2.5g concentration of C. patens powder. Eugenia aromatica powder was able to evoke 66.67% adult mortality at 96h post-treatment periods. Ethanolic extracts of C. patens caused lowest mortality (6.67%) at concentration of 1.0ml at 24h exposure period. The highest mortality (86.66%) caused by C. patens ethanolic extract was observed at concentration of 2.5ml at 96h exposure period. Ethanolic extracts of E. aromatica caused lowest mortality (13.33%) at concentration of 0.5ml at 48h exposure periods and achieved total mortality (100%) at concentration of 2.5ml at 96h exposure period. Seed damage brought about by feeding activities of the weevil reduced as the concentrations of powders increased. Percentage damage of maize grains reduced as concentration increased using both powders. It is observed that the ethanolic extracts of both plants are much more effective in insect pest control than powders.