Laboratory of Parasitology, Federal University of the Agreste of Pernambuco, Garanhuns, Pernambuco, Brazil.
Institute of Chemistry and Biotechnology, Federal University of Alagoas, Maceió, Alagoas, Brazil.
Acta Parasitol. 2024 Jun;69(2):1141-1147. doi: 10.1007/s11686-024-00835-w. Epub 2024 Apr 3.
Rhipicephalus (Boophilus) microplus is one the most significant ectoparasite in cattle farming in tropical and subtropical regions, causing problems to livestock health worldwide. The control of this ectoparasite primarily relies on the use of synthetic acaricides. However, the emergence of acaricide resistance has stimulated the search for new control alternatives, including phytocompounds with acaricidal and insecticidal potential. The aim of this study was to evaluate the acaricidal potential of Lavandula dentata essential oil against the engorged females of R. (B.) microplus.
Engorged females were obtained from infested bovines in dairy farms in Pernambuco, Brazil. L. dentata essential oil was extracted, and adult immersion test assays were performed using the following oil concentrations: 0.2%, 0.4%, 0.6%, 0.8%, and 1%.
L. dentata essential oil at a concentration of 1% was lethal to all engorged females, and concentrations of 0.6% and 0.8% caused mortality of 98.6% and 99.1%, respectively. These concentrations disrupted the reproductive capacity of engorged females, reducing oviposition by more than 90% and preventing egg hatching by over 87%.
The data revealed that L. dentata essential oil possesses effective pharmacological properties against R. (B.) microplus and could be used for tick control following in vivo evaluation, thus contributing to mitigating the negative impacts of synthetic acaricide use.
璃叶花椒精油对锐缘蜱的杀蜱活性
锐缘蜱（Boophilus）是热带和亚热带地区养牛业中最重要的外寄生虫之一，给全球牲畜健康带来问题。这种外寄生虫的控制主要依赖于使用合成杀蜱剂。然而，杀蜱剂耐药性的出现刺激了对新的控制替代方案的探索，包括具有杀蜱和杀虫潜力的植物化合物。本研究旨在评估薰衣草精油对锐缘蜱饱血雌蜱的杀蜱活性。
从巴西伯南布哥州奶牛场受感染的牛身上获得饱血雌蜱。提取薰衣草精油，并使用以下油浓度进行成虫浸泡试验：0.2%、0.4%、0.6%、0.8%和 1%。
浓度为 1%的薰衣草精油对所有饱血雌蜱均具有致死作用，浓度为 0.6%和 0.8%分别导致 98.6%和 99.1%的死亡率。这些浓度破坏了饱血雌蜱的生殖能力，使产卵量减少 90%以上，孵化率降低 87%以上。
数据表明，薰衣草精油对锐缘蜱具有有效的药理特性，可以在体内评价后用于蜱的控制，从而有助于减轻合成杀蜱剂使用的负面影响。
