Abstract
The juvenile hormone analog acetaldehyde, 2-(2-ethoxyethoxy) ethyl p-(methylthio) phenyl acetal, topically applied in a concentration of 10 μg/5 μl acetone/female, terminated diapause and induced vitellogenesis and oviposition in fed female Argas (Persicargas) arboreus Kaiser, Hoogstraal, and Kohls (Argasidae). This is the first reported hormonal termination of diapause in argasid ticks. A full bloodmeal and mating were critical factors controlling oviposition in nondiapausing females, and may enhance juvenile hormone activity. Experiments suggest that tick bodies possess sites of hormonal activities similar to those in other arthropods.
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