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Varroase et résistance

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INSECTS 11/01/17 Influence of Varroa Mite (Varroa destructor) Management Practices on Insecticide Sensitivity in the Honey Bee (Apis mellifera) INFECTION, GENETICS AND EVOLUTION - 2015 - A selective sweep in a Varroa destructor resistant honeybee (Apis mellifera) population. APIDEOLOGIE - 2002 - First report of Varroa destructor resistance to pyrethroids in the UK. PLOS 13/06/14 Increased Tolerance and Resistance to Virus Infections: A Possible Factor in the Survival of Varroa destructor-Resistant Honey Bees (Apis mellifera) Abstract The honey bee ectoparasitic mite, Varroa destructor, has a world-wide distribution and inflicts more damage than all other known apicultural diseases.

PLOS 13/06/14 Increased Tolerance and Resistance to Virus Infections: A Possible Factor in the Survival of Varroa destructor-Resistant Honey Bees (Apis mellifera)

However, Varroa-induced colony mortality is more accurately a result of secondary virus infections vectored by the mite. This means that honey bee resistance to Varroa may include resistance or tolerance to virus infections. The aim of this study was to see if this is the case for a unique population of mite-resistant (MR) European honey bees on the island of Gotland, Sweden.

This population has survived uncontrolled mite infestation for over a decade, developing specific mite-related resistance traits to do so. Citation: Locke B, Forsgren E, de Miranda JR (2014) Increased Tolerance and Resistance to Virus Infections: A Possible Factor in the Survival of Varroa destructor-Resistant Honey Bees (Apis mellifera). Editor: Olav Rueppell, University of North Carolina, Greensboro, United States of America Copyright: © 2014 Locke et al. INSTITUTO POLITECNICO DE BRAGANCA - 2005 - How resistant to fluvalinate are varroa populations in Portugal? Selected paper prepared for presentation at the Southern Agricultural Economics Association annual meeting, Orlando, Florida, February 5-8, 2006 Factors Influencing the Adoption of Russian Varroa-Resistant Honey Bees. BEEKEEPING - Comment faire face à la recrudescence des Varroa résistants? Réduction de la population de Varroa au printemps Si l’on dénombre, fin mai, plus de trois Varroa par jour, il est conseillé de ne pas attendre jusqu’à août, mais d’appliquer, à l’occasion de la prochaine période sans miellée, un traitement d’une semaine à l’acide formique ou deux traitements ponctuels.

BEEKEEPING - Comment faire face à la recrudescence des Varroa résistants?

De tels traitements augmentent la teneur en acide formique dans le miel, c’est pourquoi ils ne doivent être appliqués qu’un cas de force majeur. Si l’on découpe à deux ou trois reprises le couvain de mâles, on arrive à réduire la population de Varroa d'environ de moitié et, par la formation d’un nuclei, d’un tiers environ. Il vaut donc la peine d’intégrer de telles mesures dans la conduite du rucher. Figure 1 : les méthodes de lutte alternative contre Varroa ne conduisent au succès que si elles sont intégrées dans une stratégie de lutte.

Traitement de longue durée à l’acide formique On trouve sur le marché différents diffuseurs pour les traitements de longue durée. La Fédération des apiculteurs du Québec - DÉVELOPPEMENT DE LA RÉSISTANCE NATURELLE DE L’ABEILLE À LA VARROASE DANS LE CONTEXTE DE L’ÉLABORATION D’UNE STRATÉGIE DE LUTTE INTÉGRÉE. ANSES 20/06/05 Avis du 26 mai 2005 relatif à l'apparition des résistances du parasite Varroa, responsable d'une maladie parasitaire réputée contagieuse des abeilles, face aux médicaments vétérinaires utilisés couramment dans la lutte contre cette maladie. Rev Mex Cienc Pecu 2011;2(1):93-99 Evaluation of the resistance of the mite Varroa destructor to the fluvalinate in colonies of honey bees (Apis mellifera) in Yucatan, Mexico. INTERNAT. J. ACAROL. - 2005 - The resistance of varroa mites (Acari: varroidae) to acaricides and the presence of esterase. Apidologie 31 (2000) 437–441 Control of Varroa jacobsoni Oud. resistant to fluvalinate and amitraz using coumaphos.

INRA - 2008 - Sélection d’abeilles résistantes à Varroa destructor : inhibition de la reproduction des varroas et destruction des alvéoles infestées par les abeilles. ROTHAMSTED RESEARCH/BBSRC 07/08/14 Poster : Resistance to pyrethroids in Varroa destructor. PLOS 18/12/13 An Amino Acid Substitution (L925V) Associated with Resistance to Pyrethroids in Varroa destructor. The Varroa mite, Varroa destructor, is an important pest of honeybees and has played a prominent role in the decline in bee colony numbers over recent years.

PLOS 18/12/13 An Amino Acid Substitution (L925V) Associated with Resistance to Pyrethroids in Varroa destructor

Although pyrethroids such as tau-fluvalinate and flumethrin can be highly effective in removing the mites from hives, their intensive use has led to many reports of resistance. To investigate the mechanism of resistance in UK Varroa samples, the transmembrane domain regions of the V. destructor voltage-gated sodium channel (the main target site for pyrethroids) were PCR amplified and sequenced from pyrethroid treated/untreated mites collected at several locations in Central/Southern England.

A novel amino acid substitution, L925V, was identified that maps to a known hot spot for resistance within the domain IIS5 helix of the channel protein; a region that has also been proposed to form part of the pyrethroid binding site. Figures Editor: Guy Smagghe, Ghent University, Belgium Copyright: © 2013 González-Cabrera et al. Introduction. ROTHAMSTED RESEARCH - DEC 2013 - Rothamsted researchers have developed a sensitive assay for the detection and management of resistance to pyrethroids in Varroa-infected honey bee hives.

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ROTHAMSTED RESEARCH - DEC 2013 - Rothamsted researchers have developed a sensitive assay for the detection and management of resistance to pyrethroids in Varroa-infected honey bee hives.

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