Product effectiveness of A. subulatum essential oil against Hyalomma spp. 1: A. subulatum oil 0.31%; 2: A. subulatum oil 0.62%; 3: A. subulatum oil 1.25%; 4: A. subulatum 2.50%; 5: A. subulatum oil 5%; 6: positive control; 7: negative control; Bars with the same superscript symbols differ non-significantly from each other (P>0.05).