Chaiphongpachara Tanawat, Laojun Sedthapong
Department of Public Health and Health Promotion, College of Allied Health Sciences, Suan Sunandha Rajabhat University, Bangkok, Thailand.
J Adv Vet Anim Res. 2020 Jun 29;7(3):391-396. doi: 10.5455/javar.2020.g433. eCollection 2020 Sep.
The objective of this study was to determine the comparative larvicidal efficacy of commercial ylang-ylang essential oils from India and Thailand against the mosquito to be used as a guideline for mosquito control.
The bioassay for the larvicidal activity of commercial ylang-ylang essential oils in this experiment was modified from the World Health Organization standard protocols. The concentration ranges at 0.025, 0.050, 0.075, 0.100, 0.125, and 0.150 ppm in each treatment were used for testing, and four replicates were used per concentration. The larval mortality was observed and recorded 24- and 48-h after exposure.
The results of this study clearly revealed that commercial ylang-ylang essential oils from India and Thailand were highly toxic to the larvae of the dengue vector , and Indian ylang-ylang had an LC value of 0.064 ppm, whereas Thai ylang-ylang had an LC value of 0.042 ppm after 24-h exposure.
This study revealed the efficacy of commercial Indian and Thai ylang-ylang essential oils as natural vector control for the larval stage of the dengue vector . Usually, natural larvicide products are not commonly found in the market due to complex production processes. The results of this research support the use of commercial essential oils to aid in further control of mosquito larvae populations in the community.
本研究的目的是确定来自印度和泰国的商用依兰依兰精油对蚊子的相对杀幼虫效果，以作为蚊虫控制的指导。
本实验中商用依兰依兰精油杀幼虫活性的生物测定是根据世界卫生组织标准方案修改而来。每个处理的浓度范围为0.025、0.050、0.075、0.100、0.125和0.150 ppm用于测试，每个浓度使用四个重复。在暴露24小时和48小时后观察并记录幼虫死亡率。
本研究结果清楚地表明，来自印度和泰国的商用依兰依兰精油对登革热媒介的幼虫具有高毒性，暴露24小时后，印度依兰依兰的LC值为0.064 ppm，而泰国依兰依兰的LC值为0.042 ppm。
本研究揭示了商用印度和泰国依兰依兰精油作为登革热媒介幼虫阶段天然病媒控制剂的功效。通常，由于生产过程复杂，天然杀幼虫剂产品在市场上并不常见。本研究结果支持使用商用精油来进一步控制社区中的蚊虫幼虫数量。
