J Am Mosq Control Assoc. 2020 Sep 1;36(3):161-166. doi: 10.2987/20-6952.1.
The control of Aedes aegypti with synthetic pesticides may result in adverse effects on wildlife and the environment. Bioactive plant extracts have been proposed as one of the alternatives to chemical pesticides used against mosquitoes. Here, we report on the ovicidal and latent effects of ethanolic, petroleum ether, and chloroform leaf extracts of Pulicaria jaubertii at 25 to 150 ppm each against the life stages of laboratory stain of Ae. aegypti. At 150 ppm, the ethanolic leaf extract resulted in 100% ovicidal activity, followed by petroleum ether extract (74%), and chloroform extract about 7% mortality. The ethanolic extract produced 100% larval and pupal mortality at both 75 and 50 ppm, while the petroleum ether extract produced 76.5 and 58.3%, respectively. The ethanolic extract recorded the highest percentage of adult mortality (72.7%) at the lowest concentration (25 ppm). At 25 and 50 ppm, the ethanolic extract resulted in 62.2 and 85.2% sterility index of Ae. aegypti females, respectively, as compared with the 0.1 and 3.5% sterility index caused by the chloroform extract at the same concentrations. In conclusion, P. jaubertii appears to have potential to be further evaluated as a mosquito control agent. Additional studies are needed on its mode of action, synergism with other products, and efficacy under actual field conditions.
合成农药控制埃及伊蚊可能会对野生动物和环境产生不利影响。生物活性植物提取物已被提议作为替代化学农药用于防治蚊子的方法之一。在这里，我们报告了每 25 至 150ppm 的 Pulicaria jaubertii 叶的乙醇、石油醚和氯仿提取物对实验室埃及伊蚊品系各个生活阶段的杀卵和潜伏作用。在 150ppm 时，乙醇叶提取物导致 100%的杀卵活性，其次是石油醚提取物（74%），而氯仿提取物约 7%的死亡率。乙醇提取物在 75 和 50ppm 时均导致 100%的幼虫和蛹死亡，而石油醚提取物分别导致 76.5%和 58.3%的死亡率。乙醇提取物在最低浓度（25ppm）下记录到最高的成虫死亡率（72.7%）。在 25 和 50ppm 时，乙醇提取物分别导致埃及伊蚊雌性的 62.2%和 85.2%的不育指数，而在相同浓度下，氯仿提取物导致的不育指数分别为 0.1%和 3.5%。总之，P. jaubertii 似乎有可能进一步评估作为一种控制蚊子的手段。需要对其作用方式、与其他产品的协同作用以及实际田间条件下的功效进行额外的研究。
