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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 |
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Main Authors: | , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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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). |
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ISSN: | 0932-0113 1432-1955 |
DOI: | 10.1007/s00436-021-07063-5 |