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Susceptibility of Varroa destructor (Acari: Varroidae) to synthetic acaricides in Uruguay: Varroa mites’ potential to develop acaricide resistance

Maggi, Matías Daniel and Ruffinengo, Sergio Roberto and Mendoza, Yamandú and Ojeda, Pilar and Ramallo, Gustavo and Floris, Ignazio and Eguaras, Martín Javier (2011) Susceptibility of Varroa destructor (Acari: Varroidae) to synthetic acaricides in Uruguay: Varroa mites’ potential to develop acaricide resistance. Parasitology Research, Vol. 108 (4), p. 815-821. ISSN 0932-0113. eISSN 1432-1955. Article.

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DOI: 10.1007/s00436-010-2122-5

Abstract

The purpose of this study was to estimate the acaricide susceptibility of Varroa destructor populationsfrom Uruguay, which had never been exposed to synthetic acaricides. It was also to determine whether acaricide resistance to coumaphos occurred in apiaries in which acaricide rotation had been applied. Bioassays with acaricides against mite populations that had never been exposed to synthetic acaricides were performed, also against mite populations in which control failures with coumaphos had been reported. Additionally, coumaphos’ effectiveness in honeybee colonies was experimentally tested. The lethal concentration that kills 50% of the exposed animals (LC50) for susceptible mite populations amounted to 0.15 μg/Petri dish for coumaphos and to less than 0.3 μg/Petri dish for the other acaricides. Coumaphos LC50 was above 40 μg/Petri dish for resistant mites. The effectiveness of coumaphos in honeybee colonies parasitized by V. destructor ranged from 17.6% to 93.9%. LC50 for mite populations susceptible to the most commonly applied miticides was determined, and the first case of coumaphos resistance recorded in Uruguay was established.

Item Type:Article
ID Code:6119
Status:Published
Refereed:Yes
Uncontrolled Keywords:Varroa destructor, Apis mellifera, acaricide
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/11 Entomologia generale e applicata
Divisions:001 Università di Sassari > 01 Dipartimenti > Protezione delle piante
Publisher:Springer Berlin / Heidelberg
ISSN:0932-0113
eISSN:1432-1955
Copyright Holders:© Springer-Verlag 2010
Deposited On:08 Jun 2011 14:23

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