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Ralph Büchler - One of the best experts on this subject based on the ideXlab platform.
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performance of Honey Bee Colonies under a long lasting dietary exposure to sublethal concentrations of the neonicotinoid insecticide thiacloprid
Pest Management Science, 2017Co-Authors: Reinhold Siede, Marina D Meixner, Christian Maus, Bernd Grünewald, Lena Faust, Ralph BüchlerAbstract:BACKGROUND Substantial Honey Bee colony losses have occurred periodically in the last decades. The drivers for these losses are not fully understood. The influence of pests and pathogens are beyond dispute, but in addition, chronic exposure to sublethal concentrations of pesticides has Been suggested to affect the performance of Honey Bee Colonies. This study aims to elucidate the potential effects of a chronic exposure to sublethal concentrations (one realistic worst-case concentration) of the neonicotinoid thiacloprid to Honey Bee Colonies in a three year replicated colony feeding study. RESULTS Thiacloprid did not significantly affect the colony strength. No differences between treatment and control were observed for the mortality of Bees, the infestation with the parasitic mite Varroa destructor and the infection levels of viruses. No colony losses occurred during the overwintering seasons. Furthermore, thiacloprid did not influence the constitutive expression of the immunity-related hymenoptaecin gene. However, upregulation of hymenoptaecin expression as a response to bacterial challenge was less pronounced in exposed Bees than in control Bees. CONCLUSION Under field conditions, Bee Colonies are not adversely affected by a long-lasting exposure to sublethal concentrations of thiacloprid. No indications were found that field-realistic and higher doses exerted a biologically significant effect on colony performance. © 2017 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Performance of Honey Bee Colonies under a long-lasting dietary exposure to sublethal concentrations of the neonicotinoid insecticide thiacloprid.
Pest management science, 2017Co-Authors: Reinhold Siede, Marina D Meixner, Christian Maus, Bernd Grünewald, Lena Faust, Ralph BüchlerAbstract:Substantial Honey Bee colony losses have occurred periodically in the last decades. The drivers for these losses are not fully understood. The influence of pests and pathogens are beyond dispute, but in addition, chronic exposure to sublethal concentrations of pesticides has Been suggested to affect the performance of Honey Bee Colonies. This study aims to elucidate the potential effects of a chronic exposure to sublethal concentrations (one realistic worst-case concentration) of the neonicotinoid thiacloprid to Honey Bee Colonies in a three year replicated colony feeding study. Thiacloprid did not significantly affect the colony strength. No differences between treatment and control were observed for the mortality of Bees, the infestation with the parasitic mite Varroa destructor and the infection levels of viruses. No colony losses occurred during the overwintering seasons. Furthermore, thiacloprid did not influence the constitutive expression of the immunity-related hymenoptaecin gene. However, upregulation of hymenoptaecin expression as a response to bacterial challenge was less pronounced in exposed Bees than in control Bees. Under field conditions, Bee Colonies are not adversely affected by a long-lasting exposure to sublethal concentrations of thiacloprid. No indications were found that field-realistic and higher doses exerted a biologically significant effect on colony performance. © 2017 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. © 2017 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
B. Cornelissen - One of the best experts on this subject based on the ideXlab platform.
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Data underlying the publication: "Corpse removal increases when Honey Bee Colonies experience high Varroa destructor infestation"
2020Co-Authors: Frank Van Langevelde, Fionne Kiggen, Coby Van Dooremalen, B. CornelissenAbstract:Datasets of the publication "Corpse removal increases when Honey Bee Colonies experience high Varroa destructor infestation" published in Insectes Sociaux
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Loss rates of Honey Bee Colonies during winter 2017/18 in 36 countries participating in the COLOSS survey, including effects of forage sources
Journal of Apicultural Research, 2019Co-Authors: Alison Gray, B. Cornelissen, Robert Brodschneider, Noureddine Adjlane, Alexis Ballis, Valters Brusbardis, Jeandaniel Charriere, Robert Chlebo, Mary F Coffey, Cristina CostaAbstract:This short article presents loss rates of Honey Bee Colonies over winter 2017/18 from 36 countries, including 33 in Europe, from data collected using the standardized COLOSS questionnaire. The 25,3...
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loss rates of Honey Bee Colonies during winter 2017 18 in 36 countries participating in the coloss survey including effects of forage sources
Journal of Apicultural Research, 2019Co-Authors: Alison Gray, B. Cornelissen, Robert Brodschneider, Noureddine Adjlane, Alexis Ballis, Valters Brusbardis, Jeandaniel Charriere, Robert Chlebo, Mary F Coffey, Cristina CostaAbstract:This short article presents loss rates of Honey Bee Colonies over winter 2017/18 from 36 countries, including 33 in Europe, from data collected using the standardized COLOSS questionnaire. The 25,3...
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Single and interactive effects of Varroa destructor, Nosema spp., and imidacloprid on Honey Bee Colonies (Apis mellifera)
Ecosphere, 2018Co-Authors: Coby Van Dooremalen, B. Cornelissen, Chula Poleij‐hok‐ahin, Tjeerd BlacquièreAbstract:High losses of Honey Bee Colonies in recent decades are of great societal and economical concern and experienced as a sign of the vulnerability of the environment, including the service of crop pollination, and of the Beekeeping sector. There is no single cause for the colony losses, but many contributing stressors may act in concert. Varroa destructorinfestation is acknowledged as an important cause of these losses. The roles of infestation by Nosema ceranae or exposure to insecticides are controversial. Interactions between exposure to pesticides and V. destructor or Nosema spp. have previously Been implicated. In two years of field experiments, we studied the effects of and possible interactions between the stressors V. destructor infestation, Nosema spp. infestation, and chronic sublethal exposure to a field‐realistic dose of the insecticide imidacloprid on the performance and survival of Honey Bee Colonies. Colonies highly infested by V. destructorwere 13% smaller in size and were 59.1 times more likely to die than Colonies infested with low levels of V. destructor. Infestation with high levels of Nosema sp. led to 2% decrease in size and 1.4 times higher likelihood to die compared to Colonies with low levels of Nosema sp. No effects of chronic sublethal exposure to imidacloprid on colony size or survival were found in this study. Exposure to V. destructor and imidacloprid led to a slightly higher fraction of Bees infested with Nosema sp., but in contrast to the expectations, no resulting interactions were found for colony size or survival. Colonies as a superorganism may well be able to compensate at the colony level for sublethal negative effects of stressors on their individuals. In our experimental study under field‐realistic exposure to stressors, V. destructor was by far the most lethal one for Honey Bee Colonies.
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Swarm prevention and spring treatment against Varroa destructor in Honey Bee Colonies (Apis mellifera)
2006Co-Authors: B. Cornelissen, Lonne GerritsenAbstract:In 2004 and 2005 experiments were carried out to test the efficacy and efficiency of Varroa control combined with swarm prevention methods in spring. Honey Bee Colonies were split in an artificial swarm and a brood carrier. Hereafter the swarms were treated with oxalic acid and the brood carriers either with formic acid (2004) or Thymovar (2005). Both the oxalic acid and the formic acid were very effective, resulting in an average efficacy of 97% and 96%, respectively. There was some worker Bee mortality in both treatments. Thymovar was less effective (71%), but did not cause any worker Bee mortality. The results show that the combination of Varroa control and swarm prevention can
Reinhold Siede - One of the best experts on this subject based on the ideXlab platform.
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performance of Honey Bee Colonies under a long lasting dietary exposure to sublethal concentrations of the neonicotinoid insecticide thiacloprid
Pest Management Science, 2017Co-Authors: Reinhold Siede, Marina D Meixner, Christian Maus, Bernd Grünewald, Lena Faust, Ralph BüchlerAbstract:BACKGROUND Substantial Honey Bee colony losses have occurred periodically in the last decades. The drivers for these losses are not fully understood. The influence of pests and pathogens are beyond dispute, but in addition, chronic exposure to sublethal concentrations of pesticides has Been suggested to affect the performance of Honey Bee Colonies. This study aims to elucidate the potential effects of a chronic exposure to sublethal concentrations (one realistic worst-case concentration) of the neonicotinoid thiacloprid to Honey Bee Colonies in a three year replicated colony feeding study. RESULTS Thiacloprid did not significantly affect the colony strength. No differences between treatment and control were observed for the mortality of Bees, the infestation with the parasitic mite Varroa destructor and the infection levels of viruses. No colony losses occurred during the overwintering seasons. Furthermore, thiacloprid did not influence the constitutive expression of the immunity-related hymenoptaecin gene. However, upregulation of hymenoptaecin expression as a response to bacterial challenge was less pronounced in exposed Bees than in control Bees. CONCLUSION Under field conditions, Bee Colonies are not adversely affected by a long-lasting exposure to sublethal concentrations of thiacloprid. No indications were found that field-realistic and higher doses exerted a biologically significant effect on colony performance. © 2017 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
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Performance of Honey Bee Colonies under a long-lasting dietary exposure to sublethal concentrations of the neonicotinoid insecticide thiacloprid.
Pest management science, 2017Co-Authors: Reinhold Siede, Marina D Meixner, Christian Maus, Bernd Grünewald, Lena Faust, Ralph BüchlerAbstract:Substantial Honey Bee colony losses have occurred periodically in the last decades. The drivers for these losses are not fully understood. The influence of pests and pathogens are beyond dispute, but in addition, chronic exposure to sublethal concentrations of pesticides has Been suggested to affect the performance of Honey Bee Colonies. This study aims to elucidate the potential effects of a chronic exposure to sublethal concentrations (one realistic worst-case concentration) of the neonicotinoid thiacloprid to Honey Bee Colonies in a three year replicated colony feeding study. Thiacloprid did not significantly affect the colony strength. No differences between treatment and control were observed for the mortality of Bees, the infestation with the parasitic mite Varroa destructor and the infection levels of viruses. No colony losses occurred during the overwintering seasons. Furthermore, thiacloprid did not influence the constitutive expression of the immunity-related hymenoptaecin gene. However, upregulation of hymenoptaecin expression as a response to bacterial challenge was less pronounced in exposed Bees than in control Bees. Under field conditions, Bee Colonies are not adversely affected by a long-lasting exposure to sublethal concentrations of thiacloprid. No indications were found that field-realistic and higher doses exerted a biologically significant effect on colony performance. © 2017 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry. © 2017 The Authors. Pest Management Science published by John Wiley & Sons Ltd on behalf of Society of Chemical Industry.
Agostina Giacobino - One of the best experts on this subject based on the ideXlab platform.
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Environment or Beekeeping management: What explains better the prevalence of Honey Bee Colonies with high levels of Varroa destructor?
Research in veterinary science, 2017Co-Authors: Agostina Giacobino, Ana Molineri, Adriana Pacini, Hernan Pietronave, Natalia Bulacio Cagnolo, Emanuel Orellano, Julieta Merke, E. Bertozzi, Germán Masciangelo, Marcelo SignoriniAbstract:Varroa destructor is one of the major threats to Honey Bee Colonies. The mite abundance in the Colonies is affected by environmental conditions as well as by Beekeeping management. The aim of this study was to recognize the main drivers associated with autumn V. destructor infestation in Honey Bee Colonies when different regions from Argentina are compared. A total of 361 Colonies distributed in five Argentinean eco-regions were examined to evaluate Varroa mite infestation rate during autumn and Nosema sp. presence. Regions were different regarding annual temperature, precipitation and especially vegetation landscape. In addition, Beekeeping management practices were obtained from a checklist questionnaire answered by the Beekeepers. The prevalence of Colonies with high infestation level was lower in semi-arid Chaco followed by humid and transition Chaco regions. Also, Colonies that were positive for Nosema sp. showed a higher Varroa infestation rate. The "environmental" effect was stronger compared with the influence of secondary drivers associated with Beekeeping activities. As well, a significant association between V. destructor infestation rates and Nosema presence was identified. Under contrasting natural conditions, environment seems a predominant driver on Varroa destructor infestation level in Honey Bee Colonies.
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varroa destructor and viruses association in Honey Bee Colonies under different climatic conditions
Environmental Microbiology Reports, 2016Co-Authors: Agostina Giacobino, Ana Molineri, Adriana Pacini, Norberto Fondevila, Hernan Pietronave, Graciela Rodriguez, Alejandra Palacio, Natalia Bulacio Cagnolo, Emanuel Orellano, Cesar SaltoAbstract:Summary Honey Bee Colonies are threatened by multiple factors including complex interactions between environmental and diseases such as parasitic mites and viruses. We compared the presence of HoneyBee-pathogenic viruses and Varroa infestation rate in four apiaries: commercial Colonies that received treatment against Varroa and non-treated Colonies that did not received any treatment for the last 4 years located in temperate and subtropical climate. In addition, we evaluated the effect of climate and Varroa treatment on deformed wing virus (DWV) amounts. In both climates, DWV was the most prevalent virus, being the only present virus in subtropical Colonies. Moreover, Colonies from subtropical climate also showed reduced DWV amounts and lower Varroa infestation rates than Colonies from temperate climate. Nevertheless, non-treated Colonies in both climate conditions are able to survive several years. Environment appears as a key factor interacting with local Bee populations and influencing colony survival beyond Varroa and virus presence.
Robert Brodschneider - One of the best experts on this subject based on the ideXlab platform.
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Loss rates of Honey Bee Colonies during winter 2017/18 in 36 countries participating in the COLOSS survey, including effects of forage sources
Journal of Apicultural Research, 2019Co-Authors: Alison Gray, B. Cornelissen, Robert Brodschneider, Noureddine Adjlane, Alexis Ballis, Valters Brusbardis, Jeandaniel Charriere, Robert Chlebo, Mary F Coffey, Cristina CostaAbstract:This short article presents loss rates of Honey Bee Colonies over winter 2017/18 from 36 countries, including 33 in Europe, from data collected using the standardized COLOSS questionnaire. The 25,3...
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loss rates of Honey Bee Colonies during winter 2017 18 in 36 countries participating in the coloss survey including effects of forage sources
Journal of Apicultural Research, 2019Co-Authors: Alison Gray, B. Cornelissen, Robert Brodschneider, Noureddine Adjlane, Alexis Ballis, Valters Brusbardis, Jeandaniel Charriere, Robert Chlebo, Mary F Coffey, Cristina CostaAbstract:This short article presents loss rates of Honey Bee Colonies over winter 2017/18 from 36 countries, including 33 in Europe, from data collected using the standardized COLOSS questionnaire. The 25,3...
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multi country loss rates of Honey Bee Colonies during winter 2016 2017 from the coloss survey
Journal of Apicultural Research, 2018Co-Authors: Robert Brodschneider, Alison Gray, Noureddine Adjlane, Alexis Ballis, Valters Brusbardis, Jeandaniel Charriere, Robert Chlebo, Mary F Coffey, Bjorn Dahle, Dirk C. De GraafAbstract:In this short note we present comparable loss rates of Honey Bee Colonies during winter 2016/2017 from 27 European countries plus Algeria, Israel and Mexico, obtained with the COLOSS questionnaire....
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Preliminary analysis of loss rates of Honey Bee Colonies during winter 2015/16 from the COLOSS survey
Journal of Apicultural Research, 2016Co-Authors: Robert Brodschneider, Alison Gray, Noureddine Adjlane, Valters Brusbardis, Jeandaniel Charriere, Robert Chlebo, Mary F Coffey, Karl Crailsheim, Romee Van Der Zee, Bjorn DahleAbstract:In this short note we present comparable loss rates of Honey Bee Colonies during winter 2015/16 from 29 countries, obtained with the COLOSS questionnaire. Altogether, we received valid answers from 19,952 Beekeepers. These Beekeepers collectively wintered 421,238 Colonies, and reported 18,587 Colonies with unsolvable queen problems and 32,048 dead Colonies after winter. This gives an overall loss rate of 12.0% (95% confidence interval 11.8%-12.2%) during winter 2015/16, with marked differences among countries. Beekeepers in the present study assessed 7.6% (95% CI 7.4%-7.8%) of their Colonies as dead or empty, and 4.4% (95% CI 4.3%-4.5%) as having unsolvable queen problems after winter. The overall analysis showed that small operations suffered higher losses than larger ones. A table with detailed results and a map showing response and relative risks at regional level are presented
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preliminary analysis of loss rates of Honey Bee Colonies during winter 2015 16 from the coloss survey
Journal of Apicultural Research, 2016Co-Authors: Robert Brodschneider, Alison Gray, Noureddine Adjlane, Valters Brusbardis, Jeandaniel Charriere, Robert Chlebo, Mary F Coffey, Karl Crailsheim, Romee Van Der Zee, Bjorn DahleAbstract:In this short note we present comparable loss rates of Honey Bee Colonies during winter 2015/16 from 29 countries, obtained with the COLOSS questionnaire. Altogether, we received valid answers from 19,952 Beekeepers. These Beekeepers collectively wintered 421,238 Colonies, and reported 18,587 Colonies with unsolvable queen problems and 32,048 dead Colonies after winter. This gives an overall loss rate of 12.0% (95% confidence interval 11.8-12.2%) during winter 2015/16, with marked differences among countries. Beekeepers in the present study assessed 7.6% (95% CI 7.4-7.8%) of their Colonies as dead or empty, and 4.4% (95% CI 4.3-4.5%) as having unsolvable queen problems after winter. The overall analysis showed that small operations suffered higher losses than larger ones. A table with detailed results and a map showing response and relative risks at regional level are presented.