Obembe Olusola Michael, Ojo Durojaye Olanrewaju, Ileke Kayode David
Department of Plant Science and Biotechnology, Faculty of Science, Ekiti State University, P.M.B 5363, Ado Ekiti, Nigeria.
Department of Zoology and Environmental Biology, Faculty of Science, Ekiti State University, P. M. B. 5323, Ado Ekiti, Nigeria.
Heliyon. 2020 Oct 14;6(10):e05215. doi: 10.1016/j.heliyon.2020.e05215. eCollection 2020 Oct.
is the most damaging insect pest of stored cowpea () seeds in Nigeria. Thus, this present research work was put in place to assess the insecticidal activities of the extracts obtained from the leaf and stem bark of (Lam.) Benth against the cowpea seed beetle, The parameters that were assessed were adult mortality, oviposition and adult emergence of The experiments were conducted under laboratory conditions of 28±2 °C temperature and 75 ± 5% relative humidity. The extracts were applied at dosages of 0.3, 0.6, 0.9 and 1.2 mL per 20 g of cowpea seeds. The two extracts of were found to be toxic to the survival of the However, the extract obtained from the leaf was more potent to the beetle than the extract obtained from the stem bark of the same plant. The two extracts also reduced ovipositipon and completely suppressed adult emergence at the highest dose of 1.2 mL per 50 g of cowpea seeds. The results obtained in the present research work showed that the two extracts of were effective in suppressing the population of the infamous stored pest of cowpea seed beetle and could therefore be recommended to replace the harmful synthetic chemical insecticides in protecting cowpea seeds in storage.
在尼日利亚，是贮藏豇豆种子最具破坏性的害虫。因此，开展本研究工作以评估从（Lam.）Benth的叶和茎皮中提取的提取物对豇豆象鼻虫的杀虫活性。评估的参数包括成虫死亡率、产卵量和成虫羽化率。实验在温度28±2°C和相对湿度75±5%的实验室条件下进行。提取物的施用剂量为每20克豇豆种子0.3、0.6、0.9和1.2毫升。发现该植物的两种提取物对豇豆象鼻虫的存活具有毒性。然而，从叶中提取的提取物对该甲虫的毒性比从同一植物的茎皮中提取的提取物更强。两种提取物还降低了产卵量，并在每50克豇豆种子1.2毫升的最高剂量下完全抑制了成虫羽化。本研究工作获得的结果表明，该植物的两种提取物在抑制臭名昭著的贮藏害虫豇豆象鼻虫种群方面是有效的，因此可以推荐用其替代有害的合成化学杀虫剂来保护贮藏中的豇豆种子。
