Abstract
Search to a new alternative to control bovine ticks (Rhipicephalus microplus), the present study aimed to evaluate the acaricidal activity of organo-modified siloxane alone and in association with different commercial products or with piperonyl butoxide (BPO). Engorged females were subjected to an in vitro immersion test and 10 groups were used: control, 0.5% siloxane, 1% siloxane, 2% siloxane, 0.5% siloxane + 5% BPO, 1% siloxane + 5% BPO, 2% siloxane + 5% BPO, commercial product, 0.5% siloxane + commercial product, and 1% siloxane + commercial product. After immersion, engorged females were incubated for 14 days for oviposition and hatchability tests. Another immersion test was performed with 5% siloxane and 2.5% siloxane + 10% BPO to evaluate the histopathological changes. Then, engorged females were incubated for 0, 2, 4, 8, 12, 24, 36, 48, 60, 72, 84, 96, 120, 144, and 168 h and immersed in 10% formaldehyde for later analyses. The unassociated siloxane showed an acaricide efficacy of 93.88% at 2% concentration, and when associated with 5% BPO, it reached 100% efficacy at all tested concentrations. The tested commercial products showed enhanced efficacy when associated with siloxane. Histopathological analysis showed cell changes in both treatments and total cell disintegration after 120 h in the 5% siloxane group and after 96 h in the 2.5% siloxane + 10% BPO group. Therefore, siloxane alone or in combination is an alternative against R. microplus, and siloxane enhances the efficacy of available commercial products.
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The authors are grateful for the availability and collaboration of producers and their employees in carrying out this work.
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This study was funded by the Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) (FFV-Process: 407289/2018–6) and Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Brazil (final code: 001).
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Ries, A.S., Roman, I.J., Bräunig, P. et al. Acaricide activity of organo-modified siloxane and acaricide associations in Rhipicephalus microplus. Parasitol Res 120, 3673–3680 (2021). https://doi.org/10.1007/s00436-021-07335-0
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DOI: https://doi.org/10.1007/s00436-021-07335-0