Potency and Repellence Effects of Jatropha curcas L. Extracts With and Without Pirimiphos-methyl against Callosobruchus subinnotatus (Pic.) in Stored Bambara Groundnut, Vigna subterranea (L.) Verdcourt
NJE Vol. 41(2): 133-144, 2025
DOI.10.36108/NJE/5202/14.0201
1Dattijo, S. A., 2Ajayi, F. A., 3Adebitan, S. A., 4Gurama, U. A., 5Yusuf, S. R. and 2Bello, I. H
1Department of Pest Management Technology, Audu Bako College of Agriculture Dambatta, P. M. B. 3159, Kano, Kano State, Nigeria
2Department of Agronomy, Faculty of Agriculture, Federal University of Lafia, P. M. B. 146, Lafia, Nasarawa State, Nigeria
3Department of Crop Science and Horticulture, Faculty of Agriculture Federal University, Oye-Ekiti, Ekiti State, Nigeria
4Department of Agronomy, Faculty of Agriculture, Federal University Kashere, Gombe State, Nigeria
5Department of Crop Protection, Faculty of Agriculture, Bayero University Kano, Kano State, Nigeria
Abstract
The study evaluated the potency and repellence effects of Jatropha curcas L. leaf and seed powders and their combinations with and without reduced rate of Pirimiphos-methyl, on Callosobruchus subinnotatus (Pic.) a major pest of Bambara groundnut, Vigna subterranea (L.) Verdcourt. Factorial experiments (4×4×2) and (2×2×2) for potency and repellence assessments, respectively, were laid out in a Complete Randomized Design (CRD) and replicated three (3) times to assess the impact of the different treatment combinations. Potency was assessed by counting emerged adults 60 days after treatment (DAT), while repellence was monitored during the first 5 hours post-application. The results showed that the treatment with 1.5g leaf powder + 0.0g seed powder + 0.00g Pirimiphos-methyl exhibited 100% potency effect (P ≤ 0.001), while the treatment with 0.5g leaf powder + 0.5g seed powder + 0.01g Pirimiphos-methyl showed up to 90% repellence effect (P ≤ 0.01). The study highlighted that J. curcas have the potential to serve as a botanical insecticide for the sustainable management of C. subinnotatus in stored Bambara groundnut.
Keywords: Jatropha curcas, Callosobruchus subinnotatus, Botanical insecticide, Potency, Repellence, Bambara groundnut, sustainable pest management