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Resistance of the cattle tick Rhipicephalus (Boophilus) microplus to fluazuron in Argentina

Resumen
The aim of this work is to report the presence of resistance to fluazuron in a population of Rhipicephalus microplus in Argentina. The evidence was obtained from field and in vitro trials. In the field trial, cattle infested with ticks was treated with two commercial formulations of fluazuron. The in vitro trial (adult immersion test, AIT) was performed by using technical grade fluazuron. In the field trial, there were no significant differences between [ver mas...]
The aim of this work is to report the presence of resistance to fluazuron in a population of Rhipicephalus microplus in Argentina. The evidence was obtained from field and in vitro trials. In the field trial, cattle infested with ticks was treated with two commercial formulations of fluazuron. The in vitro trial (adult immersion test, AIT) was performed by using technical grade fluazuron. In the field trial, there were no significant differences between the treated and control groups between days 2 and 34 post-treatment. The only exceptions (treated group I in day 14 post-treatment, treated group II in days 23 and 29 post-treatment) had a significantly lower tick load than the untreated group, but the efficacy was not higher than 70%. Viable engorged females were collected on both groups of treated bovines in all counts, and the production of viable larvae was not precluded with the application of the two commercial formulations of fluazuron evaluated in this study. The results obtained with the in vitro assay (AIT) also indicate that the R. microplus population tested in this work has a higher level of resistance to fluazuron than another susceptible field strain. The integrated analysis of the field and in vitro trials clearly reveals the emergence of resistance to fluazuron in a R. microplus population from Argentina. This diagnosis of resistance does not imply that the fluazuron has lost its functionality at a regional scale, but it highlights the need to establish control strategies that minimize the use of this drug in order to preserve its functionality as an acaricide. [Cerrar]
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Autor
Torrents, Jorgelina;   Sarli, Macarena;   Sarmiento, Nestor Fabian;   Rossner, Maria Victoria;   Morel, Nicolas;   Guglielmone, Alberto;   Nava, Santiago;  
Fuente
Experimental and Applied Acarology (Published: 03 May 2022)
Fecha
2022-05
Editorial
Springer
ISSN
0168-8162
1572-9702
URI
http://hdl.handle.net/20.500.12123/11834
https://link.springer.com/article/10.1007/s10493-022-00713-y
DOI
https://doi.org/10.1007/s10493-022-00713-y
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INTA/2019-PE-E5-I109-001/2019-PE-E5-I109-001/AR./Convocatoria: Estudios para el control de enfermedades subtropicales y/o transmitidas por vectores (Tristeza Bovina, Garrapatas, Miasis, Tripanosomiasis, Lengua Azul y la

Palabras Claves
Rhipicephalus; Ganado Bovino; Cattle; Plagas de Animales; Pests of Animals; Control de Plagas; Pest Control; Acaricidas; Acaricides; Argentina; Garrapatas; Ticks; Rhipicephalus (Boophilus) microplus; Fluazuron;
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