A study was conducted to evaluate the toxicity of some botanicals on maize weevils. Nine botanical powders from six plant species were used. All botanical powders were applied at 5g, 10g and 15g rate of application on disinfected 200g maize grains. Clausena anisata showed the highest cumulative maize weevil mortality in all dosages of application. Complete inhibition of F1 progenies emergence was observed at all dosages of botanical powder application in Clausena anisata (100%) equally with 5% Malathion dust. The lowest grain damage was observed in leaf powder of Clausena anisata treatment (2.43%, 1.37% and 0.63%), respectively, at all application rates. At 15g rate of application, Clausena anisata, Carica papaya and Vernonia amygdalina showed the lowest grain weight loss, 0.63%, 1.33%and 1.77%, respectively. Maize seed germination showed no significant difference (P>0.05) among all treatments but there was significant difference (P<0.001) among applied doses. In conclusion, all botanical powders at 15g had significant effects on mortality rate against S. zeamais within 56 days of exposure. Therefore, Botanicals had a promising significant effect on grain damage and weight loss protection and all botanicals were recommended for maze grain protection from maize weevils with increased dosage and increased storage time.
Keywords: Clausena anisata, Maize weevil, Exposure days, Different dosage, Carica papaya.