Department of Biochemistry, Microbiology and Biotechnology, Kenyatta University, P.O. Box 4844-00100, Nairobi, Kenya.
Department of Chemistry, Kenyatta University, P.O. Box 43844-00100, Nairobi, Kenya.
ScientificWorldJournal. 2021 Feb 25;2021:2718629. doi: 10.1155/2021/2718629. eCollection 2021.
infestation is among the major setbacks to sustainable maize farming and availability. It causes an estimated annual loss of 5-10% and 20-30% of the total maize grains loss in the temperate and tropical zones, respectively. Although synthetic pesticides are quick and effective in managing crop pests, their overuse and misuse is discouraged due to their detrimental effects on human and environment. Natural pesticidal products that are extracted from plants are particularly gaining importance as an alternative to synthetic pesticides. They are available, easily biodegraded and have low toxicity to nontarget organisms. Most botanical pesticides act on insects by repelling them away from the crops in the field or in the stores. Therefore, this study aimed to determine repellency potential of organic leaf extracts of and on . . The phytochemical profile of and was determined using GC-MS. Laboratory-based experiments were carried out using area preference method to assess the efficacy of the extracts against weevils for a test period of 5 h. Six groups of experiments were set up with ten in each test: positive control (Actellic), negative control (solvent only), and four different experimental extract concentrations (25, 50, 75, and 100%).
The results indicated that and leaf extracts possess potent repellency effect on weevils. All the extracts simply discouraged from the treated areas recording significantly good levels of repellent activities between 26 and 96%. Furthermore, the GC-MS analysis manifested the presence of bioactive compound in the extracts which are associated with the repellency effects.
The study scientifically confirms the traditional use of the and and provides important platform for further study on the extracts as bioresource of botanical repellent.
虫害是可持续玉米种植和供应的主要障碍之一。据估计，它分别在温带和热带地区造成玉米总损失的 5-10%和 20-30%。尽管合成农药在防治作物害虫方面快速有效，但由于其对人类和环境的有害影响，不鼓励过度和滥用。从植物中提取的天然杀虫产品作为合成农药的替代品越来越受到重视。它们可获得、易于生物降解且对非靶标生物的毒性低。大多数植物性农药通过将昆虫从田间或仓库中的作物上驱赶开来而对昆虫起作用。因此，本研究旨在确定 和 的有机叶提取物对 的驱避潜力。使用 GC-MS 确定 和 的植物化学成分谱。使用面积偏好法进行了基于实验室的实验，以评估提取物在 5 小时测试期内对象鼻虫的功效。设置了六组实验，每组有十个 ：阳性对照（Actellic）、阴性对照（仅溶剂）和四个不同的实验提取物浓度（25、50、75 和 100%）。
结果表明， 和 的叶提取物对象鼻虫具有很强的驱避作用。所有提取物都简单地阻止了 进入处理区域，记录的驱避活性在 26%至 96%之间非常好。此外，GC-MS 分析表明提取物中存在与驱避作用相关的生物活性化合物。
该研究从科学上证实了 和 的传统用途，并为进一步研究这些提取物作为植物驱避剂的生物资源提供了重要平台。
