EFFECT OF SOME LOCAL BOTANICAL MATERIALS FOR THE SUPPRESSION OF THE MAIZE WEEVIL SITOPHILUS ZEAMAIS (MOTSCHULSKY) (COLEOPTERA: CURCULIONIDAE) POPULATIONS
|ISSA Umar Sanda1*.AFUN Jakpasu Victor Kofi2, MOCHIAH Moses Brandford1, OWUSUAKYAW Michael1 and BRAIMAH Haruna1
|Corresponding Author: ISSA Umar Sanda, CSIR- Crops Research Institute, P O Box 3785, Kumasi, Ghana, E-mail: [email protected]|
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The commonest method of traditional storage pest’s management among small scale maize farmers in Ghana is the use of botanicals. Earlier studies on the use of plant extract showed that some minimized insect pests’ damage to acceptable levels. The objectives of this study were to identify the potency of some local botanical materials: Piper nigrum L.(black pepper seed powder), Cymbopogon nardus (citronella shoot powder), Carica papaya (pawpaw seed powder), Allium sativum (garlic bulbs paste) and Cymbopogon citrates (lemon grass shoot powder) for the treatment of stored maize and determine their minimum effective dosage for application. In a completely randomized design in olfactometer and potency test of the botanical materials, black pepper, lemon grass, pawpaw seed powder, citronella and garlic showed varying degrees of repellency decreasing in that order as well as their potency. Fifty grammes of black pepper powder in a bag (100kg) of maize were determined as the mimnimum effective concentration. Black pepper seed powder was therefore recommended at a rate of 50g/100kg maize to farmers. It was also recommended that the active ingredient of black pepper be formulated into insecticide against/ for the management of the maize storage weevil.