Ticks (Acari: Ixodida) are important blood-feeding ectoparasites acting as vectors of serious diseases of humans and animals. The camel tick, Hyalomma dromedarii is infesting camels and its control is very important for prevention of tickborne diseases. This study evaluated the adulticidal toxicity of olive oil against H. dromedarii males and engorged females using the adult immersion test. Mortalities, the number of hatched eggs, hatchability%, weight of engorged females, and egg weight were recorded. The morality% of olive oils against male H. dormidarii 12 and 15 days post treatments (PT) reached 50 and 83.33%, respectively. Its lethal concentrations (LC) values were calculated (LC 50 and LC 95 values PT for 12 days were 12.715 and 46.386%, respectively). The lethal time values expressed as LT 50 and LT 99 after male treatment with 25% were 5.161 and 22.007 days, respectively. Olive oil adversely affected the reproductive potential of H. dromedarii engorged females as 25% PT, the number of hatched eggs, hatchability%, weight of engorged females, and egg weight were 2.83±2.31, 32.7, 52.50±2.88 g, and 0.27±0.27 g, respectively. It is recommended to apply olive oil as a safe control tool against H. dormidarii and it could be implemented in integrated-tick control strategies.
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