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Pathology and parasitology

Varroa destructor: when reversion to coumaphos resistance does not happen

, , , , , , & show all
Pages 536-540 | Received 18 Dec 2017, Accepted 07 May 2018, Published online: 11 Jun 2018
 

Abstract

The ectoparasitic mite Varroa destructor is potentially the greatest threat to honey bee colonies of Apis mellifera worldwide. Acaricide rotation is widely accepted to mitigate development of resistance to synthetic acaricides. When a population has developed resistance to a compound, cessation of its use can result in some degree of susceptibility. This study aimed to follow changes in the susceptibility of mites to coumaphos in a population not treated with the acaricide over many generations. The LC50 increase over the years from 2 to 8-fold. Considering that coumaphos had not been used for nine years in the studied apiary, the results provided here lead to reflections about the problem of the resistance phenomenon and its populations dynamics.

Varroa destructor: cuando la reversión de la Resistencia a cumafós no ocurre

El ácaro ectoparásito Varroa destructor constituye una de las mayores amenazas en el mundo para las colmenas de Apis mellifera. La rotación de acaricidas es una medida ampliamente aceptada para mitigar el desarrollo de resistencia de acaricidas sintéticos. Se ha observado que, cuando se deja de aplicar un acaricida a una población resistente, luego de un periodo de tiempo la población se puede volver susceptible al mismo. El objetivo del presente trabajo fue estudiar si la susceptibilidad al cumafós de una población de Varroa destructor no expuesta a dicho acaricida durante varios años, decrece a lo largo del tiempo. Los valores de CL50 se fueron incrementando a lo largo de los años, este incremento fue desde 2 a 8 veces. Considerando que el apiario estudiado no ha sido expuesto al cumafós durante nueve años, estos resultados llevan a la reflexión sobre el problema de la resistencia a acaricidas de síntesis y su dinámica en las poblaciones.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

This work was supported by the Agencia Nacional de Promoción Científica y Tecnológica under Grant [PICT-2015-1807].

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