Effect of Two Insect Growth Regulators on the Camel Tick, Hyalomma dromedarii (Acari: Ixodoidea: Ixodidae)

摘要

Feeding and engorged nymphs and unfed and feeding adult hyalomma dromedarii were treated topically with 2 insect growth regulators (IGRs). 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.