The maize weevil, Sitophilus zeamais Motschulsky (Coleoptera: Curculionidae), is an important cause of stored maize losses in the Western highlands of Cameroon. Chemical insecticides for rapid control are expensive and not readily available. In search for cheap and easily available natural products to control this insect pest, the biological activity of ethanolic extracts of some traditionally used plant materials were evaluated against the weevil. Laboratory studies on toxicity against F1 progeny, contact toxicity and repellency against S. zeamais were conducted with ethanolic extracts of Vetiveria zizanioides roots, and Cupressus arizonica, Ocimum gratissimum, Eucalyptus grandis leaves. The ethanolic extracts of the last three plant species had significant toxicity (P = 0.01) on S. zeamais and against the F1 progeny. Percentage repellency was significant across the four plant extracts but highest in grains treated with V. zizanioides. Repellency was concentration-dependent and greater than 50 % at the lowest V. zizanioides extract concentration of 12 500 ppm. Vetiveria zizanioides could be a potential repellent for the protection of stored products against S. zeamais.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.