Ability of adults of Amblyomma hebraeum (Acarina: Ixodidae) to feed repeatedly on sheep and cattle. Field sampling of unfed adults of Amblyomma hebraeum Koch. A comparison of live and destructive sampling methods of determining the size of parasitic tick populations. Helminth and anthropod parasites of springbok, Antidorcas marsupialis, in the Transvaal and western Cape Province. Induction of hyperactivity in larvae of the cattle tick Boophilus microplus by formamidines and related compounds. Flumethrin was considered to be the compound of choice for use in pheromone/acaricide mixtures.Ītkinson, P.W. Amitraz caused the ticks to detach after an initial period of attachement there was little mortality in the detached ticks over the next two weeks and they could later be induced to re-attach to other rabbits. Chlorfenvinphos caused little mortality in the first 24 h on the ears of the rabbits, but 75% of the exposed ticks died over the next 14 days while held in an incubator. Flumethrin caused rapid and high mortality in attached and unattached ticks. None of the acaricides inhibited initial attachment.

Attachment was measured over 24 h on the ears of rabbits which had been treated with AAP and mixtures of AAP and the acaricides. Attraction, measured in field assays involving AAP and CO 2, was not inhibited by any of the acaricides.

We have investigated the effects of three acaricides, amitraz (an amidine), flumethrin (a synthetic pyrethroid) and chlorfenvinphos (an organophosphate), combined with AAP, on the attraction and attachment of the unfed adults. Pheromone/acaricide mixtures have the potential to selectively attract and kill these ticks. Unfed adults and nymphs of the bont tick Amblyomma hebraeum Koch are attracted to hosts on which fed males, emitting an aggregation-attachment pheromone (AAP), are attached.

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