Abstract
Feeding and engorged nymphs and unfed and feeding adult Hyalomma dromedarii were treated topically with 5, 20, and 50 μg of 2 insect growth regulators (IGRs): IGR-A, 3-[7-(2,6-dichlorophenoxy)-3-methyl-4-heptenyl]-2,2-dimethyloxirane, and IGR-B, 5-[(6,10-dimethyl-4,9-undecadienyl) oxy]- 1,3-benzodioxole. IGR-B was more toxic than IGR-A. Nymphs tolerated both IGRs, but emerging adults exhibited an increasing delayed mortality with dosage increase without attempting to feed; males exhibited higher mortality than females. Ticks treated in the adult stage tolerated all doses of both IGRs. Neither IGR altered the nymphal premolting period or the adult sexual behavior, but both caused a small reduction in fertility (egg hatch) of both sexes. The results suggest that these IGRs do not mimic or antagonize naturally occurring juvenoid(s) in H. dromedarii and/or that the administration method is unsuitable.
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