The activity of amitraz against infestations of Rhipicephalus appendiculatus

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Abstract
Tick‐infested adult cattle were hand sprayed with solutions containing 178 or 250 mg amitraz litre−1, prepared from a miscible oil concentrate formulation. Both concentrations achieved clearance of infestation within 7 h of spraying. All stages of tick, collected from both sprayings, subsequently died with the exception of two engorged nymphs, which moulted successfully, and six half‐fully engorged females, which all laid small batches of eggs. The eggs from the ticks treated at the higher rate failed to hatch. Expulsion of adult Rhipicephalus appendiculatus, applied daily to a single bovine which had been sprayed once at the higher rate, ceased on the 11th day after spraying. All ticks expelled from the animal died within 24 h. First feeding on the animal was visible on day‐13 and fully engorged females were first observed 18 days after spraying.