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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Methods for the quantification of resistance of apple genotypes to European fruit tree canker caused by Neonectria ditissima
Wenneker, M. ; Goedhart, Paul ; Steeg, P.A.H. van der; Weg, W.E. van de; Schouten, H.J. - \ 2017
In: Abstracts of the Third International Workshop on Apple Canker and Replant Disease. - - p. 13 - 13.
Methods for the quantification of resistance of apple genotypes to european fruit tree canker caused by Neonectria Ditissima
Wenneker, M. ; Goedhart, P.W. ; Steeg, P. Van der; Weg, W.E. Van de; Schouten, H.J. - \ 2017
Plant Disease 101 (2017)12. - ISSN 0191-2917 - p. 2012 - 2019.
European fruit tree canker, caused by Neonectria ditissima, is an important disease of pome fruit worldwide. Apple cultivars differ in their levels of susceptibility to N. ditissima. In order to design an effective plant resistance test, we examined the effectiveness of two resistance parameters: infection frequency and lesion growth. Both parameters were evaluated in parallel tests using 10 apple cultivars in three experimental years, applying seminatural infection of leaf scars (infection frequency) or inoculation of artificial wounds (lesion growth). We compared six parameters for lesion growth, of which a new parameter, lesion growth rate (LGR), appeared to be the best with respect to reproducibility and statistical significance. LGR is defined as the slope of the regression of lesion size versus time. The slope was estimated for each lesion, employing a common start date and a lesion-specific end date determined by the girdling of the lesion. The two parameters (infection frequency and LGR) were examined in separate experiments and in three successive years, and provided complementary information and resulted in reproducible conclusions on the relative resistance levels to N. ditissima of the tested cultivars. The presented methods can be used to develop strategies for the control of European fruit tree canker (e.g., in the breeding of new apple cultivars with high levels of resistance to N. ditissima).
Fruitteeltkundige evaluatie onderstammen Xenia : 2de productiejaar (2017)
Ravesloot, M.B.M. ; Steeg, Pieter van der; Sluis, B.J. van der; Anbergen, R.H.N. ; Hees, D. van; Peeters, Jan - \ 2017
Pilot onderstammen voor Opal en Reine Victoria : Productiecijfers en maatsortering teeltjaar 2017
Ravesloot, M.B.M. ; Heiden, Alma van der; Steeg, Pieter van der; Janssen, P. ; Schrama, L. ; Ebbens, A. ; Rijn, P. van - \ 2017
Een derde minder eikenprocessievlinders gevangen dan in 2016
Hellingman, S. ; Vliet, A.J.H. van; Kuppen, H. ; Jans, H. ; Buijs, J. - \ 2017
Wageningen : Nature Today
De afgelopen weken zijn in 1795 vallen 41.723 eikenprocessievlinders gevangen. Het gemiddelde aantal vlinders per val ligt daarmee 33 procent lager dan in het recordjaar 2016. Van de vijf provincies met voldoende vallen daalde het aantal vlinders in Drenthe, Gelderland en Friesland, maar steeg het aantal in Groningen en Noord-Holland. Er zijn grote regionale en lokale verschillen.
Strategieën voor vermindering van de inzet chemische gewasbeschermingsmiddelen bij houtig kleinfruit
Wenneker, Marcel ; Steeg, Pieter van der; Helsen, Herman - \ 2016
Randwijk : Praktijkonderzoek Plant & Omgeving, Business Unit Bloembollen, Boomkwekerij & Fruit (Rapport / Praktijkonderzoek Plant & Omgeving 2016-06) - 23
Fruitteeltkundige evaluatie onderstammen Xenia® : 1ste productiejaar (2016)
Ravesloot, M.B.M. ; Peeters, Jan ; Anbergen, R.H.N. ; Hees, Dirk van; Steeg, Pieter van der; Sluis, B.J. van der - \ 2016
Eerste productiecijfers en teeltervaringen pruimenonderstam WUR S766
Ravesloot, M.B.M. ; Steeg, P.A.H. van der; Dalfsen, P. van; Dubois, L.A.M. ; Ebbens, A. ; Janssen, P. ; Rijn, P. van; Schrama, L. - \ 2016
Nederlandse handelsbalans boomkwekerij
Smit, P.X. ; Jukema, G.D. - \ 2016
LEI Wageningen UR (Factsheet / LEI Wageningen UR 2016-012c) - 4 p.
handelsbalans - boomkwekerijen - bosproducten - export - nederland - balance of trade - forest nurseries - forest products - exports - netherlands
De export van boomkwekerijproducten is in 2014 met een kleine 5% gestegen tot € 1.250 mln. Het belang van Duitsland als exportbestemming is de laatste jaren sterk afgenomen. Naar het VK, België en Italië nam de export daarentegen sterk toe. Een gelijkblijvende exportwaarde in 2015 lijkt aannemelijk. De exportwaarde van boomkwekerijproducten steeg in 2014 met een kleine 5%. Omdat de importwaarde zeer klein is, heeft deze nauwelijks invloed op de handelsbalans van boomkwekerijproducten. Hierdoor steeg de handelsbalans van boomkwekerijproducten met deze exporttoename. De toename werd binnen de EU-landen gerealiseerd, want de exportwaarde en handelsbalanswaarde met landen buiten de EU nam af.
Fruitteeltkundige evaluatie Xenia
Ravesloot, M.B.M. ; Peeters, J. ; Anbergen, R.H.N. ; Hees, D. van; Steeg, P. van der; Sluis, B.J. van der - \ 2015
Sleedoorn-onderstam WUR-S766
Ravesloot, M.B.M. ; Heijerman-Peppelman, G. ; Steeg, P. van der; Dubois, L.A.M. ; Ebbens, A. ; Janssen, P. ; Rijn, P. van; Schrama, L. - \ 2015
Residuvermindering rode bes 'optimale kwaliteit - minimaal residu'
Wenneker, M. ; Steeg, P. van der - \ 2015
Innovatie & Demo Centrum : IDC Randwijk
Looman, B.H.M. ; Steeg, P. van der; Hoogervorst, P. ; Heijerman-Peppelman, G. - \ 2015
Bicarbonaat doodt schurftspore bij curatieve toepassing
Jong, P.F. de; Anbergen, R.H.N. ; Elk, P.J.H. van; Dieren, M.C.A. van; Steeg, P. van der; Franssen-Verheijen, M.A.W. - \ 2015
Bicarbonaat toepassing op droog of nat gewas?
Jong, P.F. de; Anbergen, R.H.N. ; Elk, P.J.H. van; Dieren, M.C.A. van; Steeg, P. van der; Gerhardus, L. - \ 2015
Investigation of Desso GrassMaster® as application in hydraulic engineering
Steeg, P. van der; Paulissen, M.P.C.P. ; Roex, E. ; Mommer, L. - \ 2015
Deltares - 42 p.
Grass dike - Dessa GrassMaster - grass reinforcement - dykes - grasses - cladding - hydraulic engineering - reinforcement - revetments - flood control - sports grounds - dijken - grassen - bekleding, bouw - waterbouwkunde - versterking - steunmuren - hoogwaterbeheersing - sportterreinen
Dessa GrassMaster® is a reinforced grass system which is applied successfully on sports fields and enables to use a sports field more intensively than a normal grass field. In this report the possibility of an application of Dessa GrassMaster®in hydraulic conditions, with a focus on grass dikes, is discussed.
A description of several aspects of grass dikes is given as well as other known reinforcement grass systems. A comparison between grass on sports fields and grass of grass dikes is made. Based on state-of-the art literature, requirements for Dessa GrassMaster® as a revetment under hydraulic loading are provided. Potential applications are identified and knowledge gaps are given. From the point of view of hydraulic engineering and based on theoretical and existing
knowledge, it is concluded that Dessa GrassMaster® may potentially be used as a dike revetment but more insight in the strength of this system is required/before it will be applied as a revetment. It is currently not clear what effect Dessa-Grasslvlaster'" will have on root volume and distribution in dike grasslands and how this influences overall strength of the grass cover. The strength of Dessa GrassMaster®can be determined by performing physical hydraulic experiments.
Several knowledge gaps concerning ecological, toxicological and environmental issues have been identified that may hamper the implementation of Dessa Grasslvlaster". It is recommended to perform tests to quantify these potential impacts on the environment in order to find solutions to mitigate potential negative effects. This will lead to increased societal acceptability of application of the product on dikes. For comprehensive conclusions, langerterm full-scale tests (2-4 years) are recommended.
Residuvermindering rode bes 'optimale kwaliteit - minimaal residu
Wenneker, M. ; Steeg, P. van der - \ 2015
Non-chemical control of replant disease, caused by Pratylenchus penetrans, in apple orchards in the Netherlands
Wenneker, M. ; Steeg, P. van der; Korthals, G.W. ; Visser, J. - \ 2015
IOBC/WPRS Bulletin 110 (2015). - p. 225 - 227.
Grassblock : Haalbaarheidsstudie Innovatief dijkbekledingssysteem
Steeg, P. van; Paulissen, M.P.C.P. ; Bakker, G. ; Bijlsma, E. - \ 2014
Alterra, Wageningen-UR (Alterra rapport ) - 27 p.
Selection of Prunus spinosa as a dwarfing rootstock for high density plum orchards
Maas, F.M. ; Balkhoven-Baart, J.M.T. ; Steeg, P.A.H. van der - \ 2014
In: X International Symposium on Integrating Canopy, Rootstock and Environmental Physiology in Orchard Systems. - Leuven : ISHS - ISBN 9789462610484 - p. 507 - 516.
In 1987 a selection program was started to find a dwarfing rootstock for European plums. Prunus spinosa (blackthorn) was the chosen species due to its winter hardiness, drought tolerance and previously shown compatibility with plum. In 1990 about 1000 blackthorn seedlings were budded with ‘Opal’ plum. Based on the vigour of the trees during the first year in the nursery, 113 selections were selected for further testing for their effect on tree development and fruit production. The amount of root suckers and thorns were used as additional selection criteria. In 1999 the number of selections was reduced to 24. In several trials carried out between 2006 and 2011, the vigour and yield of ‘Victoria’ on these selections was shown to vary between that on the commonly used rootstock ‘Saint Julien A’ and ‘Krymsk1’ (VVA-1), a dwarfing and highly productive rootstock that had been introduced in the Netherlands concurrently with the trials. Although ‘Krymsk11’ gives very good tree-size control and precocity, it is too dwarfing for some soils and cultivars and sensitive to bacterial canker caused by Pseudomomas syringae. Recently, the five most promising selections were planted in higher numbers. The best selection will be released as soon as it has been registered, and virus free material becomes available. Additional tests will be needed to determine the suitability of these blackthorn selections for other stone fruit species like peach and apricot and for other soils and climatic conditions.
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