Multi-resistance of Rhipicephalus microplus to amitraz, alpha-cypermethrin, and ivermectin on livestock in Ecuadorian subtropical farms.
(2024) AITVM–STVM International Conference — Location: Montpeiller, France (21.May.2024)
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- Authors
Pérez Otáñez, Ximena 
- et. al.
- Abstract
- Cattle ticks, primarily Rhipicephalus microplus, stand as the predominant overlooked ectoparasites in subtropical regions globally, significantly impacting meat and milk production and resulting in economic losses for cattle farmers. These ticks also serve as crucial vectors for pathogens like Anaplasma spp. and Babesia spp. Given Ecuador's conducive climate for tick development, acaricides have emerged as the primary method for tick control. However, their misuse has contributed to the development of resistance and multi-resistance in ticks. The effectiveness of acaricides has steadily declined in Ecuador. This study aims to assess resistance to amitraz, alpha-cypermethrin, and ivermectin. The focus is on Noroccidente de Pichincha over two years, utilizing the Larval Package Test (PLT). In the sampling conducted in 2020-2021 across 61 farms. Resistance was observed in 67.21% (41/61), 67.21% (41/61), and 57.38% (35/61) of R. microplus ticks to amitraz, alpha-cypermethrin and ivermectin, respectively. In the subsequent round one year later 2021-2022, resistance levels were 59.57% (28/47) for Amitraz, 68.09 (32/47) for alpha-cypermethrin, and 57.45% (27/47) for ivermectin. The percentage of multi-resistance for the first year was 67.21% (41/61), and for the second year, it was 65.96% (34/47). This study underscores the pervasive issue of tick resistance to acaricides in Ecuadorian cattle farming for the assessed products. Notably, there was no significant decrease in resistance between the two surveyed years, highlighting the urgent need to collaborate with farmers to evaluate and enhance practices, ensuring the sustained efficacy of active principles and the availability of acaricide control options.
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Citations
Pérez Otáñez, X., & et al. (2024). Multi-resistance of Rhipicephalus microplus to amitraz, alpha-cypermethrin, and ivermectin on livestock in Ecuadorian subtropical farms. AITVM–STVM International Conference, Montpeiller, France. https://hdl.handle.net/2078.5/260675