AVALIAÇÃO IN VITRO DA EFICÁCIA DE ACARICIDAS COMERCIAIS EM Rhipicephalus sanguineus E Rhipicephalus microplus DO MUNICÍPIO DE JARU, LESTE DE RONDÔNIA
DOI:
https://doi.org/10.17564/2316-3798.2025v10n1p534-548
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Abstract
The presence of ticks causes considerable financial damage to the health and production of animals in various areas of Brazil, including Jaru, in the state of Rondônia. These losses are due to stress, weight loss and skin wounds, which increase the cost of treatment. The indiscriminate use of acaricides has contributed to the emergence of genetic resistance to various acaricides, representing a serious problem in tick control. The aim of this study was to assess the susceptibility of the species Rhipicephalus microplus and Rhipicephalus sanguineus to the acaricides used in tick control. To this end, samples of engorged female ticks were collected from 10 properties located in different regions of the municipality of Jaru in order to carry out the biocarrapaticidogram using the teleogyn immersion test. Fipronil was the most effective active ingredient in 100% of the properties tested (10/10). Cypermethrin showed satisfactory results, achieving 90% efficacy in the properties evaluated (9/10). Deltamethrin was the least effective active ingredient, with efficacy below 90% in 50% (5/10) of the properties. Amitraz, one of the most widely used products on the farms, was effective on 70% (7/10) of the farms. Thus, the Amitraz and Deltamethrin used to control ticks on the properties visited in Jaru showed low efficacy values, according to the results of the in vitro tests. The low efficacy of acaricides is probably due to the genetic resistance developed by ticks due to indiscriminate use.
