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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    Pest categorisation of Clavibacter sepedonicus
    Bragard, C. ; Dehnen-Schmutz, Katharina ; Serio, Francesco Di; Gonthier, Paolo ; Miret, Josep Anton Jaques ; Fejer Justesen, Annemarie ; MacLeod, A. ; Magnusson, C. ; Milonas, Panagiotis ; Navas-Cortes, Juan A. ; Parnell, Stephen ; Potting, R. ; Reignault, Lucien ; Thulke, H.H. ; Werf, W. van der; Civera, Antonio Vicent ; Yuen, Jonathan ; Zappalà, Lucia ; Wolf, J.M. van der; Kaluski, Tomasz ; Pautasso, Marco ; Jacques, Marie-Agnès - \ 2019
    EFSA Journal 17 (2019)4. - ISSN 1831-4732
    bacterial ring rot of potato - European Union - pest risk - plant health - plant pest - quarantine
    Following a request from the European Commission, the EFSA Panel on Plant Health performed a pest categorisation of Clavibacter sepedonicus, a well-defined and distinguishable bacterial plant pathogen of the family Microbacteriaceae. C. sepedonicus causes bacterial ring rot of potato and is reported from North America, Asia and Europe. The bacterium is mostly tuber transmitted, but it can also enter host plants through wounds or via contaminated equipment. C. sepedonicus is regulated in Council Directive
    2000/29/EC (Annex IAII, as Clavibacter michiganensis subsp. sepedonicus) as a harmful organism whose introduction into the EU is banned. In addition, Council Directive 1993/85/EEC concerns the measures to be taken within EU Member States (MS) against C. sepedonicus to (a) detect it and determine its distribution, (b) prevent its occurrence and spread, and (c) control it with the aim of eradication. The pest is present in several EU MS, but in all cases with a restricted distribution and under official control. C. sepedonicus could enter the EU and spread primarily via host plants for planting (i.e. potato tubers).
    The pest could establish in the EU, as the main host (potato) is commonly grown and climatic conditions are favourable. Direct potato losses following infection by C. sepedonicus can be substantial and are due to the destruction of the vascular tissue, wilting of the plant and rotting of the tubers. Infected hosts can
    remain asymptomatic. The main knowledge gaps are the geographic distribution of the pest and the host range. The criteria assessed by the Panel for consideration of C. sepedonicus as a potential quarantine pest are met, while, for regulated non-quarantine pests, the criterion on the widespread presence in the EU is not met.
    Pest categorisation of the Ralstonia solanacearum species complex
    Bragard, C. ; Dehnen-Schmutz, Katharina ; Serio, Francesco Di; Gonthier, Paolo ; Miret, Josep Anton Jaques ; Fejer Justesen, Annemarie ; MacLeod, A. ; Magnusson, C. ; Milonas, P.G. ; Navas-Cortes, Juan A. ; Werf, W. van der; Wolf, J.M. van der - \ 2019
    EFSA Journal 17 (2019)2. - ISSN 1831-4732
    bacterial wilt - European Union - intraspecific diversity - pest risk - plant health - plant pest - quarantine
    Following a request from the European Commission, the EFSA Panel on Plant Health performed a pest categorisation of the Ralstonia solanacearum species complex (RSSC), a distinguishable cosmopolitan group of bacterial plant pathogens (including R. solanacearum, Ralstonia pseudosolanacearum and two
    subspecies of Ralstonia syzygii) of the family Burkholderiaceae. The RSSC causes bacterial wilt in solanaceous crops, such as potato, tomato and pepper, but can also cause wilts in other important food crops such as fruit banana, plantain banana and cassava. The pest survives in the soil, and a number of
    weed species can also be infected by the pest, often asymptomatically. The RSSC is regulated in Council Directive 2000/29/EC (Annex IAII) (indicated by its former name R. solanacearum, as delimited by Yabuuchi et al.) as a harmful organism whose introduction into the EU is banned. In addition, Council Directive 1998/57/EC (amended by Commission Directive 2006/63/CE) concerns the measures to be taken within EU Member States (MS) against the RSSC to (a) detect it and determine its distribution, (b) prevent its occurrence and spread, and (c) control it with the aim of eradication. The pest is present in several EU MS, but in all cases with a restricted distribution and under official control. New
    phylotypes of the RSSC could enter the EU primarily via host plants for planting (including seed tubers).
    The pest could establish in the EU, as climatic conditions are favourable, hosts are common and the pathogen has high adaptability. Spread is mainly via plants for planting. Substantial crop losses in the EU would occur in the presence of RSSC epidemics. The RSSC is regarded as one of the world’s most important phytopathogenic bacteria due to its broad geographical distribution, large host range, aggressiveness, genetic diversity and long persistence in soil and water. The list of hosts and commodities for which the pest is regulated is incomplete due to the high diversity of hosts and the lack of knowledge of the complete host range. Moreover, the comparative epidemiology of the different pathogen species has not yet been studied. The criteria assessed by the Panel for consideration of the RSSC as potential quarantine pest are met, while, for regulated non-quarantine pests, the criterion on the widespread presence in the EU is not met.
    Advieskaart saprotrofe schimmels
    Hofland-Zijlstra, J.D. ; Boon, H. ; Berg, A. van den; Vermunt, A. - \ 2016
    LTO Glaskracht Nederland - 4
    saprofyten - schimmels - gewasbescherming - plantgezondheid - saprophytes - fungi - plant protection - plant health
    Door toenemende druk op de toepassing van veen vervangende producten in het substraat en afnemend
    gebruik van breed werkende fungiciden worden meer risico’s verwacht met overmatig groeiende saprotrofe
    schimmels. Deze schimmels zijn niet direct schadelijk voor het gewas, maar wel voor de productie. In deze
    advieskaart staan de herkenning van de schimmels, het voorkomen van besmetting en de bijbehorende
    maatregelen centraal.
    Voorkom plantschade door giftige dampen : Tuinen bij Wageningen UR Glastuinbouw
    Eveleens-Clark, Barbara - \ 2016
    greenhouse horticulture - greenhouse technology - materials - plastics - toxic gases - toxicity - plant health - tests - fumes

    In de glastuinbouw worden tal van materialen gebruikt waarbij de kans bestaat dat deze giftige stoffen afgeven. Deze stoffen kunnen aanzienlijke schade aanrichten aan de planten in de kas. Wageningen UR Glastuinbouw beschikt over een testopstelling om materialen op voorhand te testen op fytotoxiteit van vrijkomende dampen.

    Bees and bumblebees useful for crop protection as well as pollinating : handy 'air quality detectors' pick up bacteria and fungal spores
    Steen, Sjef van der - \ 2016
    horticulture - greenhouse horticulture - apidae - bombus - pollination - plant protection - plant health - antagonism - air quality - agricultural research - flowers

    Bees and bumblebees are, thanks to their build and behaviour, good pollinators. But they have additional potential. They are also useful for disease control by transferring antagonistic microorganisms and for retrieving information about diseases in the fields. An important aspect for all these tasks is: How do we keep them working under the ‘new’ growing conditions in the greenhouse?

    Adapting greenhouse climate for enhanced biocontrol and better performance of plant protection products
    Vänninen, I. ; Meijer, R.J.M. - \ 2016
    BioGreenhouse (Fact sheet BioGreenhouse 12) - 2
    horticulture - greenhouse horticulture - plant protection - natural enemies - pesticides - environmental temperature - humidity - lighting - carbon dioxide - plant health - organic farming - tuinbouw - glastuinbouw - gewasbescherming - natuurlijke vijanden - pesticiden - omgevingstemperatuur - vochtigheid - verlichting - kooldioxide - plantgezondheid - biologische landbouw
    In greenhouse crop production, climatic parameters are often manipulated to optimize plant growth. Greenhouse climate has profound influences also on pests and their natural enemies used for biocontrol. The responses of arthropod pests, plant disease agents and natural enemies to constant temperatures and humidity are relatively well known, but many pertinent questions remain unsolved for pest and natural enemy biology and behaviour in conditions created by the newest greenhouse climate technologies and approaches. Greenhouse climate can be optimized also to benefit natural enemies and to work against pests and plant diseases, but we know less how to make this happen than we know how to manipulate plant growth through temperature, humidity, CO2 and light conditions.
    Conservation of predaceous Coccinellidae species in greenhouse ecosystems
    Papanikolaou, N.E. ; Milonas, P.G. ; Meijer, R.J.M. - \ 2016
    BioGreenhouse (Fact sheet BioGreenhouse 7) - 2
    organic farming - horticulture - greenhouse horticulture - plant health - natural enemies - habitats - coccinellidae - agroecosystems - biological control - pesticides - biologische landbouw - tuinbouw - glastuinbouw - plantgezondheid - natuurlijke vijanden - habitats - coccinellidae - agro-ecosystemen - biologische bestrijding - pesticiden
    Conservation of natural enemies is an important component of pest management, which can improve their efficacy against target pests. Conserving predaceous Coccinelidae species in agricultural ecosystems is used to enhance their biocontrol contribution. Favourable conditions in these habitats can contribute to a more efficient population regulation of several pests. Conservation efforts focus on discouraging emigration from a crop system and enhance retention time of coccinelids in periods with low prey availability. Thus, the management of agroecosystems should focus on providing resources in such temporal and spatial scale that may prevent their emigration or attract them in habitats. In addition, in a greenhouse ecosystem, another conservation action is to reduce mortality and sublethal effects caused by insecticides.
    Kansen voor toepassing van microalgen in landbouwgewassen
    Spruijt, J. ; Weide, R.Y. van der - \ 2016
    Lelystad : ACRRES - Wageningen UR (Rapport / PPO-AGV 691) - 62
    akkerbouw - tuinbouw - bemesting - algen - algenteelt - duurzame landbouw - duurzame ontwikkeling - gewasbescherming - plantgezondheid - bacteriën - biologische bestrijding - arable farming - horticulture - fertilizer application - algae - algae culture - sustainable agriculture - sustainable development - plant protection - plant health - bacteria - biological control
    Op basis van internationaal literatuuronderzoek blijken er interessante kansen voor toepassing van microalgen producten in landbouwgewassen te zijn. In dit rapport worden zowel groene algen als cyanobacteriën gedefinieerd als microalgen. Stoffen uit microalgen (met name uit cyanobacteriën) blijken in diverse onderzoeken uit de literatuur een goede bestrijding te geven van verschillende schimmels en aaltjes die in landbouwgewassen schade aanrichten. Verder is er (buiten de landbouw) insecticide-, molluscicide-, herbicide- en algacidewerking met stoffen uit cyanobacteriën aangetoond. In Nederland zijn zeewier- en algenextracten krachtens de Verordening gewasbescherming als werkzame stof goedgekeurd voor de groeiregulatie van planten. Het gebruik als bodemverbeteraar of als plantenstimulator is vooralsnog veel minder gereguleerd dan als gewasbeschermingsmiddel. Om de kansen met microalgen te benutten zou er verder geïnvesteerd moeten worden in onderzoek. Het zou duidelijk moeten worden welke werkzame stoffen uit micro algen of welke algenpreparaten andere organismen bestrijden, in welke formulering en met welke dosering. De bestrijdende, bemestende, bodem verbeterende, plantweerstand verhogende en milieueffecten van algentoepassingen zouden vergeleken moeten worden met conventionele methoden.
    Lokkende werking feromoon vooral bij aanwezigheid van plantengeur : feromoonval beschikbaar voor opsporen behaarde wants
    Tol, R.W.H.M. van; Hennekam, M. ; Yang, Daowei - \ 2015
    Onder Glas 12 (2015)12. - p. 50 - 51.
    tuinbouw - glastuinbouw - gewasbescherming - biologische bestrijding - feromoonvallen - insectenlokstoffen - geurstoffen - hemiptera - afwijkingen, planten - landbouwkundig onderzoek - plantgezondheid - groenten - snijbloemen - aubergines - cucumis - chrysanthemum - horticulture - greenhouse horticulture - plant protection - biological control - pheromone traps - insect attractants - odours - hemiptera - plant disorders - agricultural research - plant health - vegetables - cut flowers - aubergines - cucumis - chrysanthemum
    Plaagwantsen zoals behaarde wants en brandnetelwants vormen in teelten als aubergine, komkommer en chrysant een serieus probleem. Ze geven al in kleine aantallen flinke schade: bloemabortie in aubergine, stengel- en vruchtschade in komkommer en splitkoppen in chrysant. Zodra telers wantsen of wantsenschade signaleren zien ze zich al snel genoodzaakt in te grijpen met middelen die schadelijk zijn voor aanwezige biologische bestrijders tegen andere plagen; het begin van het einde van hun biologie.
    Op het spoor van de boktor
    Kleis, R. ; Copini, P. - \ 2015
    Resource: weekblad voor Wageningen UR 20 (2015)6. - ISSN 1874-3625 - p. 18 - 19.
    cerambycidae - plantgezondheid - plantenplagen - bossen - bomen - acer palmatum - jaarringen - dissertaties - cerambycidae - plant health - plant pests - forests - trees - acer palmatum - growth rings - theses
    Boktorren die uitvliegen laten sporen na in hun kraamkamer. Promovendus Paul Copini leest die sporen in jaarringen van bomen en kan zeggen wanneer de boktor is geboren. Een oordeel met gewicht.
    Development of probabilistic models for quantitative pathway analysis of plant pests introduction for the EU territory
    Douma, J.C. ; Robinet, C. ; Hemerik, L. ; Mourits, M.C.M. ; Roques, A. ; Werf, W. van der - \ 2015
    European Food Safety Authority - 435
    gewasbescherming - landen van de europese unie - plantgezondheid - siergewassen - stochastische modellen - bouwhout - vermeerderingsmateriaal - invasieve exoten - plantaardige producten - waarschijnlijkheid - risicoschatting - risicovermindering - plantenplagen - plant protection - european union countries - plant health - ornamental crops - stochastic models - building timbers - propagation materials - invasive alien species - plant products - probability - risk assessment - risk reduction - plant pests
    The aim of this report is to provide EFSA with probabilistic models for quantitative pathway analysis of plant pest introduction for the EU territory through non-edible plant products or plants. We first provide a conceptualization of two types of pathway models. The individual based PM simulates an individual consignment (or a population of such consignment) by describing the stochastic change in the state of the individual consignment over time and space. The flow-based PM, simulates the flow of infested product over time and space, without distinguishing individual consignments. We show how these two conceptualisations are mathematically related, and present, as a show case, both models for cut flowers. Second, we developed PMs for five product groups: round wood, sawn wood, cut flowers, plants for planting and seeds. For each product group we have developed a case-study (combination of product, origin and pest) to illustrate the use of the pathway models: (1) oak wood from the USA and Ceratocystis fagacearum, (2) Coniferous sawn wood from China and Bursaphelenchus xylophilus, (3) Cut orchids from Thailand and Thrips palmi, (4) Pot orchids from Thailand and Thrips palmi, and (5) Tomato seeds and Clavibacter michiganensis subsp. michiganensis from outside the European Union. An uncertainty analysis on the models shows that the pest species-specific parameters appear to be sensitive and uncertain. Third, a practical guidance is provided on i) how to develop a PM, ii) the application of PMs in @Risk (a plugin for MS Excel), and iii) application in R. Finally, future research topics are defined. Further work is needed on interpretation of results, linking quantitative outcomes of pathway modelling to pest risk scoring guidance, and evaluation of management options using pathway models.
    We zien de verbanden, nu nog de keiharde onderbouwing : Stuurgroep Interne Vruchtkwaliteit Paprika weer stap verder
    Velden, P. van; Hofland-Zijlstra, J.D. - \ 2015
    Onder Glas 12 (2015)2. - p. 12 - 13.
    glastuinbouw - groenten - paprika's - capsicum - fusarium - vruchtrot - plantenziekten - samenwerking - landbouwkundig onderzoek - plantgezondheid - gewaskwaliteit - greenhouse horticulture - vegetables - sweet peppers - capsicum - fusarium - fruit rots - plant diseases - cooperation - agricultural research - plant health - crop quality
    Als er de afgelopen twee jaar één ding duidelijk is geworden dan is het dat er heel veel factoren zijn die hun bijdrage leveren aan het ontwikkelen van Fusarium lactis in de vruchten van paprika’s. Ofwel: alles hangt met alles samen. De sleutel voor succes ligt in zorgvuldig en zorgzaam telen. Het consequent bemonsteren van geoogst product en de daaraan gekoppelde sancties hebben er wel toe bijgedragen dat iedere teler alert is geworden.
    Bijen en hommels, naast bestuivers ook nuttig bij gewasbescherming : nuttige ‘snuffelpaal’ door meenemen bacteriën en schimmels
    Arkesteijn, M. ; Steen, J.J.M. van der - \ 2015
    Onder Glas 12 (2015)8. - p. 48 - 49.
    glastuinbouw - apidae - bestuivers (dieren) - gewasteelt - plantgezondheid - gewasbescherming - antagonisten - nuttige insecten - belichting - bloei - landbouwkundig onderzoek - teeltsystemen - greenhouse horticulture - apidae - pollinators - crop management - plant health - plant protection - antagonists - beneficial insects - illumination - flowering - agricultural research - cropping systems
    Bijen en hommels zijn door hun bouw en gedrag goede bestuivers. Maar ze kunnen meer. Ze zijn ook heel geschikt om antagonistische micro-organismen voor ziektebestrijding over te brengen én informatie vanuit het veld over ziekten mee terug te nemen. Belangrijk voor al deze taken is: hoe houden we ze actief onder de ‘nieuwe’ teeltomstandigheden in de kas?
    Teelt van laanbomen op eigen wortel
    Sluis, Bart van der - \ 2015
    trees - street trees - cultivation - plant health - vegetative propagation - propagation materials - cost analysis - cropping systems - cuttings - rhizoplane
    Recirculatie snij-amaryllis ( Hippeastrum) in tweede teeltjaar (2014) : behoud plantgezondheid en voorkomen groeiremming bij hergebruik drainwater
    Kromwijk, J.A.M. ; Baar, P.H. van; Nijs, L. den; Overkleeft, J. ; Blok, C. ; Eveleens-Clark, B.A. ; Grootscholten, M. - \ 2015
    Bleiswijk : Wageningen UR Glastuinbouw (Rapport GTB 1362) - 48
    glastuinbouw - sierteelt - hippeastrum - snijbloemen - plantgezondheid - recirculatiesystemen - ultraviolette straling - waterstofperoxide - greenhouse horticulture - ornamental horticulture - hippeastrum - cut flowers - plant health - recirculating systems - ultraviolet radiation - hydrogen peroxide
    In the Netherlands most crops grown in greenhouses reuse drain water. However, in the cultivation of amaryllis cut flowers (Hippeastrum) little drainage water is being reused so far because of strong suspicions of inhibitory substances in the drainage water. To reduce the emission of nutrients to the environment an experiment was started on request of the amaryllis growers. In a greenhouse experiment drainage water of amaryllis was treated with advanced oxidation and reused. This was compared with the reuse of drainage water treated with an UV disinfector and a control treatment without the reuse of drainage water. In the first and second year of cultivation, there was no difference in production and no adverse effects were seen in crop growth. In this experiment the reuse of drainage water has been for a relatively short period for amaryllis cut flower cultivation. Therefore, the research will be continued for a third year of cultivation in 2015 with a financial contribution from amaryllis growers, the ‘Topsector Tuinbouw en Uitgangsmaterialen’ and the Product Board for Horticulture.
    Framewerk onderzoek en praktijk voor inzet biostimulanten - Bijdrage aan de groei, productiviteit en weerbaarheid
    Staalduinen, J. van; Wurff, A.W.G. van der - \ 2015
    Onder Glas 12 (2015)5. - p. 50 - 51.
    glastuinbouw - plantenfysiologie - plantenontwikkeling - plantgezondheid - groeiregulatoren - gewasproductie - optimalisatiemethoden - plantenvoeding - landbouwkundig onderzoek - tomaten - groenten - greenhouse horticulture - plant physiology - plant development - plant health - growth regulators - crop production - optimization methods - plant nutrition - agricultural research - tomatoes - vegetables
    De belangstelling van telers voor biostimulanten neemt gestaag toe. Deze producten bevorderen de groei, productiviteit en weerbaarheid van gewassen. In een gezamenlijk project met de praktijk doet Wageningen UR Glastuinbouw onderzoek naar de invloed van biostimulanten op het afweermechanisme van tomatenplanten. Het einddoel is een framewerk waarmee telers hun gewas effectief en op voorspelbare wijze weerbaarder kunnen maken.
    Het nieuwe doen in plantgezondheid
    Verberkt, H. ; Kogel, W.J. de; Zweep, A. - \ 2015
    Wageningen UR
    gewasbescherming - tuinbouw - teeltsystemen - duurzaamheid (sustainability) - innovaties - plagenbestrijding - conferenties - plantgezondheid - plant protection - horticulture - cropping systems - sustainability - innovations - pest control - conferences - plant health
    Poster van PlantgezondheidEvent 12 maart 2015.
    Workshop Groene beheersing van meeldauw: utopie of werkelijkheid?
    Hofland-Zijlstra, Jantineke - \ 2015
    plant protection - horticulture - greenhouse horticulture - workshops (programs) - mildews - botrytis - pesticides - biological treatment - greenhouse experiments - pot plants - tomatoes - agriculture and environment - plant health - led lamps
    Bodem en weerbaarheid tegen Pythium en Meloidogyne
    Wurff, Andre van der - \ 2015
    greenhouse horticulture - plant protection - plant health - field tests - pythium - plant pathogenic fungi - fungus control - biological control - soil properties - soil ecology - cut flowers - chrysanthemum
    Chrysanten op water ; ervaring na 4 proeven : update 6, 16 februari 2015
    Vermeulen, T. ; Eveleens-Clark, B.A. ; Blok, C. ; Beerens, N. ; Streminska, M.A. - \ 2015
    chrysanthemum - teeltsystemen - hydrocultuur - hygiëne - plantgezondheid - landbouwkundig onderzoek - micro-organismen - proeven - chrysanthemum - cropping systems - hydroponics - hygiene - plant health - agricultural research - microorganisms - trials
    In 2014 zijn vier teelten van chrysant op water gerealiseerd bij Wageningen UR Glastuinbouw. Het onderzoek was gericht op ziekteweerbaar. Gedurende de teelten zijn de volgende lessen geleerd : algemene aspecten van teelt op water, hygiëne en microleven.
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