Efficacy of Synthetic Pyrethroids on Camel Ticks Hyalomma dromedarii “Acari: Ixodidae” in Saudi Arabia

Abstract

Arthropods are highly effective vectors for a number of life threatening pathogens, parasites, viruses etc., across the world. Hyalomma dromedarii Koch is the prominent tick species infesting camels. Therefore, in this research we studied the insecticidal efficacy of commercially available deltamethrin (DM), Cypermethrin (Cym) and α-Cypermethrin (α-Cym) in the fight against the adult of H. dromedarii through in vitro immersion bioassays. In this study, different concentrations of all selected synthetic insecticides (25, 50, 100, and 150 ppm) were freshly prepared. In toxicity assays, compared to Cym, adult tick mortality was found to be higher in DM followed by α-Cym treated ticks. The mortaltiy rates were increased after 48 h post-treatment of synthetic pyrethroids when compared with 24 h and the LC50 values for 24 h posttreatment with DM, Cym and α-Cym were 66.93, 129.72, and 81.08 ppm respectively, whereas that 48 h post-treatment were 4.23, 37.25, and 3.12 ppm. Our findings suggest that the DM and α-Cym were more effective against adult Hyalomma dromedarii than Cym.