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Field and lab categorical assessments of deformed wing virus in honey bee colonies: - how do they relate to Varroa populations

Ano
2005
Abstract

Most of the less knowledgeable Portuguese beekeepers only become aware their honey bee colonies are infested with Varroa after spotting crippled workers with deformed wings, during routine colony inspections. Given the role deformed wing virus (DWV) and Varroa play in this outcome, we questioned (i) how closely related is the perceptible degree of deformed-wing workers to Varroa infestation levels, daily mortality rates and estimated mite populations, and (ii) if DWV lab diagnosis could improve upon the information provided by field observations of deformed-wing workers. Experiments were carried out at Evora University (N38o34’, W07o54’), from December 2002 to October 2003. We monitored levels of apparent Varroa infestation in capped worker brood and adult bees, calculated Varroa mortality rates, and estimated Varroa population sizes. The extent of deformed-wing workers visible on central/peripherical brood frames was assessed (using a 4-level categorical key), just prior to worker sampling for DWV lab diagnosis (direct ELISA). Levels of deformed-wing workers evident at colony inspections were found to be positively (P<0.01) related (i) with apparent Varroa infestation levels observed both in capped brood and on adult bees and (ii) with colony Varroa populations. However, an association with Varroa mortality rates was found unlikely (P>0.05). Laboratorial DWV results were not associated (P>0.05) either with the previously mentioned Varroa population dynamics variables or DWV categorical field assessments. Overall, colonies where DWV wa positively lab-diagnosed hosted smaller (925 +- 292, P<0.05) Varroa populations and suffered from lower Varroa densities [both in capped brood (11.5 +- 4.0%) and adult bees (3.1 +- 1.2%)

Palavras Chave

Varroa; Virus; Abelhas / Varroa; Virus; DWV; Honey bees.

Tipo de Apresentação
Comunicação oral
Tipo de Revisão
Internacional
Âmbito Geográfico
Internacional
Situação
Publicado
Área de Trabalho
Referência

Murilhas, A. (2005). Field and lab categorical assessments of deformed wing virus in honey bee colonies: - how do they relate to Varroa populations. Diagnosis of Bee Diseases Symposium of the World Organisation for Animal Health, pp.1-11. World Organisation for Animal Health. Dublin, Irlanda.