Comparative Studies of Effect of Extracts of Zanthoxylum zanthoxyloides (Lam) Zepernick & Timleron
Callosobruchus maculatus FInfestation in Stored Vigna unguiculata (L) Walp
1Mohammad Gbate, 2Patience N. Egerson and 3Grace N. Ekundayo
1,2&3Department of Science Laboratory Technology
The Federal Polytechnic, Bida, Niger State, Nigeria.
E-mail: gbatenda@yahoo.com
ABSTRACT
Comparative studies were conducted to determine the biopesticide efficacy of ethanol and methanol extracts of root bark of Zanthoxylum zanthoxyloides in arresting Callosobruchus maculatus infestation in stored Vigna unguiculata. 1%, 2% and 4% w/v of aqueous solution of the extracts were used in treatment of infected cowpea. Weight lost, number of insect emerged and viability of the seeds was measured over three generations. In both ethanol and methanol extracts of the plant, 4% extract have the highest effect on the stored product; reducing mean weight loss to 1.8g and 3.9g after the third generation respectively and mean number of insect emergence to 18 and 23 after the third generation respectively. They also gave seed viability test of 77.5% and 80% respectively. The result shows no significant difference statistically at 5% probability when compared to that of synthetic insecticide (DDVP) applied at recommended dosage. The efficacy of the extract appears to increase with increasing concentration 1 % < 2 % < 4 %.