Abstract：
This study aimed to evaluate the acaricidal potential of the essential oils of Cananga odorata L. (ylang-ylang), Illicium verum (star anise), and Foeniculum vulgare (sweet fennel) in Rhipicephalus microplus engorged females. The essential oils were extracted by hydrodistillation, and the females were immersed in each essential oil at concentrations ranging from 10 μL/mL to 50 μL/mL, using 10% dimethyl sulfoxide as a solvent. Tick mortality was evaluated after seven and 14 days, and the following parameters were determined: female weight before oviposition, preoviposition period, egg mass weight, egg production index, incubation period, hatching rate, fecundity, percentage of reduction in oviposition, percentage of reduction in hatching and product efficacy. Lethal concentration (LC50) values were 34.42 μL/mL (28.34-40.86) for C. odorata and 40.60 μL/mL (32.58-58.21) for F. vulgare. This parameter was not calculated for I. verum because there was insufficient mortality at the concentrations evaluated. The greatest efficacy was observed in the group treated with 40 μL/mL F. vulgare essential oil (97.17%), followed by I. verum (91.35%) and C. odorata (86.19%) at the same concentration. Efficacy results were associated with a greater reduction in egg mass weight and lower hatching rates. Although the essential oils caused a slight acaricidal impact, they showed significant effects on the reproductive performance of R. microplus engorged females. Thus, the results of this study indicate that these essential oils can be used in the development of new acaricidal formulations.
摘要：
本研究旨在评估CanangaodorataL.（依兰）精油的杀螨潜力，八角（八角），和Foeniculumvulgare（甜茴香）在Rhipicephalusmicro加上充血的雌性中。精油通过加氢蒸馏提取，将雌性浸入每种精油中，浓度范围为10μL/mL至50μL/mL，使用10%二甲基亚砜作为溶剂。在7天和14天后评估滴答死亡率，并确定以下参数：产卵前的雌性体重，产卵前期,鸡蛋质量重量,鸡蛋生产指数,潜伏期,孵化率,繁殖力，产卵减少的百分比，孵化和产品功效减少的百分比。对于C.odorata，致死浓度（LC50）值为34.42μL/mL（28.34-40.86），对于F.vulgare，为40.60μL/mL（32.58-58.21）。由于在所评估的浓度下死亡率不足，因此未计算该参数。在用40μL/mLF治疗的组中观察到最大的疗效。（97.17％），其次是相同浓度的I.verum（91.35％）和C.odorata（86.19％）。功效结果与更大的蛋质量重量减少和更低的孵化率相关。虽然精油引起轻微的杀螨作用，它们对R.microplus充血雌性的繁殖性能表现出显着影响。因此，这项研究的结果表明，这些精油可用于开发新的杀螨制剂。
