Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Bioassays to Quantify Hygienic Behavior in Honey Bee (Apis Mellifera L.) Colonies : A Review
Leclercq, Gil ; Francis, Frédéric ; Gengler, Nicolas ; Blacquière, Tjeerd - \ 2018
Journal of Apicultural Research 57 (2018). - ISSN 0021-8839 - p. 663 - 673.
Apis mellifera - Ascosphaera apis - bioassays - hygienic behavior - Paenibacillus larvae - Varroa destructor

Individual immunity in honey bees (Apis mellifera L.) is complemented by highly evolved social behaviors. Among them, hygienic behavior has a key role involving the detection and removal of unhealthy or dead brood. Since the 1960s, several bioassays have been developed to quantify the hygienic behavior of honey bee colonies against chalkbrood, American foulbrood, and varroa infested brood. Here, we review the five main bioassays used since the late 1960s. We describe their advantages and disadvantages, including a special focus on their inherent biases. For each assay, we also discuss whether or not their use should be restricted to quantify the hygienic behavior against chalkbrood, or American foulbrood, or varroa infested brood. Overall, the bioassays involving the removal of freeze-killed brood are recommended over the bioassays relying on the removal of pin-killed brood but only for the quantification of hygienic behavior toward chalkbrood and American foulbrood. These bioassays are not recommended to quantify the hygienic behavior toward varroa infested brood, for which an accurate assessment should rely on assays based on the removal of brood artificially infested with varroa mites. Choosing an appropriate bioassay is crucial for an accurate assessment of the hygienic behavior against a defined pathogen, depending on the research question, or the goal of the breeding program. Bioensayos para cuantificar el comportamiento higiénico en las colonias de abejas melíferas (Apis mellifera L.): una revisión La inmunidad individual de las abejas melíferas (Apis mellifera L.) se complementa con comportamientos sociales altamente evolucionados. Entre ellos, el comportamiento higiénico tiene un papel clave en la detección y eliminación de crías enfermas o muertas. Desde la década de 1960, se han desarrollado varios bioensayos para cuantificar el comportamiento higiénico de las colonias de abejas melíferas frente a la cría infestada de Ascosfera, loque americana y varroa. Aquí revisamos los cinco principales bioensayos utilizados desde finales de la década de 1960. Describimos sus ventajas y desventajas, incluyendo un enfoque especial en sus sesgos inherentes. Para cada ensayo, también discutimos si su uso debe ser restringido o no para cuantificar el comportamiento higiénico contra la cría de loque americana o la cría infestada de varroa. En general, los bioensayos que involucran la eliminación de la cría muerta por congelación son más recomendables que los bioensayos que dependen de la eliminación de la cría muerta por pin, pero sólo para la cuantificación del comportamiento higiénico hacia la cría infestada de Ascosfera y la loque americana. Estos bioensayos no se recomiendan para cuantificar el comportamiento higiénico de la cría infestada de varroa, para lo cual una evaluación precisa debe basarse en ensayos basados en la extracción de la cría infestada artificialmente con ácaros de la varroa. La elección de un bioensayo apropiado es crucial para una evaluación precisa del comportamiento higiénico frente a un patógeno definido, dependiendo de la pregunta de investigación o del objetivo del programa de cría.

Single and interactive effects of Varroa destructor, Nosema spp., and inidacloprid on honey bee colonies (Apis mellifera)
Dooremalen, J.A. van; Cornelissen, A.C.M. ; Hok Ahin, C.H. ; Blacquiere, T. - \ 2018
Ecosphere 9 (2018)8. - ISSN 2150-8925
colony losses - colony size - colony survival - field-realistic exposure - pesticides - stressor
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.
Effect op honingbijenvolken van andere stressoren samen met de exotische invasieve varroamijt
Dooremalen, Coby van - \ 2018
wetenschappelijke manuscript in voorbereiding
Red de bij (KennisOnline in beeld 2018)
Dooremalen, Coby van - \ 2018
How to Catch a Small Beetle: Top Tips for Visually Screening Honey Bee Colonies for Small Hive Beetles
Cornelissen, A.C.M. ; Neumann, Peter - \ 2018
Bee World 95 (2018)3. - ISSN 0005-772X - p. 99 - 102.
Ein Plädoyer für den Einsatz der natürlichen Widerstandsfähigkeit der Honigbienen in der Bienenhaltang and -zucht
Blacquière, T. ; Panziera, Delphine - \ 2018
Wageningen : Wageningen University & Research - 11 p.
Übersetzung ins Deutsche von Claudia Blauert aus der englischen Originalversion von: Tjeerd Blacquière & Delphine Panziera (2018) A Plea for Use of Honey Bees’ Natural Resilience in Beekeeping, Bee World, 95:2, 34-38, DOI: 10.1080/0005772X.2018.1430999
Bijscholing voor de werkgroepen Diagnose
Cornelissen, A.C.M. - \ 2018
Bijenhouden 12 (2018)1. - ISSN 1877-9786 - p. 27 - 27.
Wat kun je nog leren als je al jaren bezig bent met bijengezondheid? Voor de leden van de werkgroepen Diagnose is dat niet zo moeilijk in te vullen. Er valt altijd wat te leren. Afgelopen zomer organiseerde Bijen@wur een zomerschool waar de leden van de diagnosewerkgroepen konden oefenen.
De Aziatische hoornaar: gevolgen voor bestuivers en bestuiving.
Cornelissen, A.C.M. ; Tom, Jolanda ; Dooremalen, J.A. van; Tol, R.W.H.M. van - \ 2018
Wageningen : Wageningen University & Research - 42 p.
Aziatische hoornaar, - honingbijen - invasieve exoot - bestuiving - bijengezondheid
De Aziatische hoornaar is een invasieve exoot die op onder andere honingbijen jaagt. De gevolgen van de aanstaande introductie voor bestuivers wordt in dit rapport op basis van een literatuurstudie onderzocht. Daarnaast wordt een strategisch beleidsadvies geformuleerd voor het omgaan met de Aziatische hoornaar.
A Plea for Use of Honey Bees’ Natural Resilience in Beekeeping
Blacquière, Tjeerd ; Panziera, Delphine - \ 2018
Bee World 95 (2018)2. - ISSN 0005-772X - p. 34 - 38.
Invasieve exoten van honingbijen
Cornelissen, Bram - \ 2018
Natuurlijke selectie levert weerbare honingbijen
Blacquiere, Tjeerd - \ 2018
Wie beslist, de natuur, de imker of beide? : Selectie bij bijen
Blacquière, T. ; Brascamp, P. - \ 2018
Bijenhouden 2018 (2018)1. - ISSN 1877-9786 - p. 14 - 19.
Selecteren is hetzelfde als kiezen. Sinds bijen worden gehouden hebben imkers gekozen welke volken ze aanhouden en welke niet. Er werd altijd al gekozen en daarmee de volgende generatie koninginnen, darrenmoeders en darren bepaald. Elke imker had zijn eigen wisselende voorkeuren voor eigenschappen en ras. Toch had de natuur ook inbreng: zwermen vertrokken en zwermen kwamen.
The Perfect Match: Simultaneous Strawberry Pollination and Bio-Sampling of the Plant Pathogenic Bacterium Erwinia pyrifoliae by Honey Bees Apis mellifera
Steen, Sjef van der; Bergsma-Vlami, M. ; Wenneker, M. - \ 2018
Sustainable Agriculture Research 7 (2018)1. - ISSN 1927-050X - p. 25 - 32.
In this study we show that honey bee colonies placed in a greenhouse for pollination of strawberry can simultaneously be used to indicate the presence of the plant pathogenic bacterium Erwinia pyrifoliae. This was demonstrated by using two methods of qualitative sacrificial and non-sacrificial bio sampling of the honey bee colony. A novel method for non-sacrificial subsampling, named the Beehold device, was applied. Applying the Beehold device did not disturb or affect negatively the honey bee colony. The study demonstrated that the integration of pollination service and bio-sampling functioned. In the sacrificially derived honey bee subsamples, E. pyrifoliae was detected prior to any visible infection in the plant; however, E. pyrifoliae was detected via non-sacrificial sampling at the same time as plant infection was first observed. The Beehold device is a practical tool for monitoring plant pathogens via forager bees during flowering until fruit onset, but is not as sensitive as directly sampling honey bees.
La eliminación higiénica de la cría congelada no predice caracteres de resistencia ante Varroa en las poblaciones no seleccionadas
Leclercq, Gil ; Blacquière, Tjeerd ; Gengler, Nicolas ; Francis, Frédéric - \ 2018
Journal of Apicultural Research 57 (2018)2. - ISSN 0021-8839 - p. 1292 - 299.
freeze-killed brood - hygienic behavior - reproductive success - Varroa-resistance
In honey bees (Apis mellifera L.), hygienic behavior of workers against Varroa destructor provides the colonies with some resistance to this parasite. The removal of freeze-killed brood (FKB) has often been used as a proxy to assess the removal of Varroa-infested brood. The question is whether this approximation is reliable enough to estimate the benefits induced by the removal of Varroa-infested brood in unselected stocks. For this purpose, we investigated the relation between the removal of FKB and three other variables: (1) the percentage of pupae and workers infested by V. destructor; (2) the share of mites in brood compared to phoretic mites; and (3) the reproductive success of mites. To be a reliable estimate, the removal of FKB should correlate with these three variables. Since hygienic behavior is naturally expressed and highly variable in unselected stocks, we chose to use such stocks to get a wide range of FKB removal. There was no correlation between FKB and the three other variables. We conclude that removal of FKB is not a good estimate for hygienic behavior towards Varroa mites in unselected stocks.
Alle vertrouwen in de bij: Interview met wetenschapper Tjeerd Blacquière (Bijen@wur)
Blacquiere, Tjeerd - \ 2017
Lagere overleving bijenvolken tijdens afgelopen winter
Steen, Sjef van der - \ 2017
Leidt een voor insecten beter zichtbare val tot betrouwbaarder vallen? : Visuele attractie van plaaginsecten
Tol, R.W.H.M. van; Dooremalen, J.A. van - \ 2017
Wageningen : Wageningen University & Research
De meeste valsystemen om insecten te vangen werken niet goed of niet goed genoeg. Slechts 10 tot 15% van de insecten wordt daadwerkelijk gevangen en soms is dit nog minder. Met de geurstoffen die gebruikt worden om insecten te lokken, lukt het niet om de insecten ook daadwerkelijk op de val te laten landen. In dit project wordt onderzocht of en hoe een voor het insect beter zichtbare val de effectiviteit van insectenvallen kan verbeteren.
Are more visible traps more effective? : Visual attraction for pest insects: a fundamental step towards optimum monitoring and mass trapping
Tol, R.W.H.M. van; Dooremalen, J.A. van - \ 2017
Wageningen : Wageningen University & Research
Most insect traps are visually poorly attractive. Only 10-15% of the insects are actually trapped and sometimes this figure is even lower. The scents used to lure insects may effectively lure them from a distance to the trap but the visual properties of the current traps do rarely encourage them to land on the trap. This project examines the extent to which a more visible insect trap can increase the effectiveness of these traps.
Nationaal programma Honing 2017 - 2019 : Bijenhouderij met toekomst: naar weerbare bijen en minder bijensterfte
Dooremalen, J.A. van; Blacquiere, T. ; Cornelissen, A.C.M. ; Steen, J.J.M. van der - \ 2017
Wageningen : Wageningen University & Research
Lord of the Rings
Blacquiere, Tjeerd - \ 2017
Internationale workshop ‘Lord of the Rings’: hoe resistent zijn de selecties in internationale vergelijking?’
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