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An update on amitraz efficacy against Rhipicephalus microplus after 15 years of disuse

Amitraz is an acaricide that is widely used in veterinary medicine to control the cattle tick Rhipicephalus microplus . However, controversy exists in the literature regarding the resistance of R. microplus to this product. The present work provides an update on the acaricidal efficacy of amitraz (T...

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Published in:Parasitology research (1987) 2021-03, Vol.120 (3), p.1103-1108
Main Authors: Cavalcante, Alliny Souza de Assis, Ferreira, Lorena Lopes, Couto, Luiz Fellipe Monteiro, Zapa, Dina María Beltrán, Heller, Luciana Maffini, Nicaretta, João Eduardo, Cruvinel, Leonardo Bueno, Junior, Rubens Dias Melo, Soares, Vando Edésio, de Souza, Guilherme Rocha Lino, Monteiro, Caio Márcio de Oliveira, Lopes, Welber Daniel Zanetti
Format: Article
Language:English
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Summary:Amitraz is an acaricide that is widely used in veterinary medicine to control the cattle tick Rhipicephalus microplus . However, controversy exists in the literature regarding the resistance of R. microplus to this product. The present work provides an update on the acaricidal efficacy of amitraz (Triatox®, 12.5 % amitraz) after 15 years without its use on a property. Two in vivo (bovines treated with amitraz and submitted to tick counts, n = 20 animals) and one in vitro (adult immersion test, n = 40 ticks) assays were performed to determine product efficacy. The efficacy of the commercial formulation tested in the first in vivo trial ranged from 14.1 to 47.0%, and in the second from 3.6 to 35.1%, for the 28 days of the experiments. Efficacy for the in vitro trial was 47.38%. The dose recommended by the manufacturer of the product did not cause mortality to most of the ticks of this strain, and efficacy/resistance was not reverted or modified after 15 years (estimated 60 tick generations).
ISSN:0932-0113
1432-1955
DOI:10.1007/s00436-021-07063-5