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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    Nederlandse notenteelt : Kennis en innovatie ten behoeve van de ontwikkeling van notenteelt in Nederland
    Reuler, Henk van; Schoutsen, Maureen ; Cuperus, Fogelina ; Groot, Marianne ; Keur, Joran ; Ravesloot, Marc ; Schepers, Huub ; Ruigrok, Thijs - \ 2020
    Wageningen : Stichting Wageningen Research, Wageningen Plant Research, Business unit Open Teelten (Rapport / Stichting Wageningen Research, Wageningen Plant Research, Business unit Open teelten WPR-843) - 92
    Bemestingsschema’s voor Nieuw Nederlands Weiden
    Philipsen, A.P. ; Lenssinck, F.A.J. ; Jong, Kees de; Hin, Kees-Jaap ; Mekkelholt, Winnie ; Bos, Albert-Jan ; Beer, Mark de; Schepers, René - \ 2020
    Wageningen : Wageningen Livestock Research - 43 p.
    Nieuw Nederlands Weiden is de oplossing voor melkveehouders die meer vers gras willen omzetten naar melk, maar wel met een eenvoudig en goed inpasbaar systeem. Nieuw Nederlands Weiden is overzichtelijk voor zowel de melkveehouder en de koe, omdat voor beiden, elke dag, duidelijk is waar ze aan toe zijn.
    'Phytophthora gerichter te lijf'
    Schepers, Huub - \ 2020
    Proceedings of the seventeenth EuroBlight workshop : York- United Kingdom, 12-15 May 2019
    Schepers, H.T.A.M. - \ 2019
    Wageningen : Wageningen University & Research, Bussiness Unit Field Crops (Report WPR 954) - 252
    Strijd zwarte spikkel begint al in teelt
    Schepers, Huub ; Tramper, Marcel - \ 2019
    Bestrijding van Phytophthora en Alternaria in zetmeelaardappelen: invloed van toevoegingsstoffen en waterkwaliteit
    Schepers, H.T.A.M. - \ 2019
    Steeds agressievere Phytophthora vraagt nog preciezer werken
    Schepers, H.T.A.M. ; Kessel, G.J.T. - \ 2019
    Steeds agressievere Phytophthora vraagt nog preciezer werken
    Schepers, H.T.A.M. ; Kessel, G.J.T. - \ 2019

    De opkomst van nieuwe agressievere stammen van Phytophthora infestans vraagt volgens WUR-onderzoekers Huub Schepers en Geert Kessel extra alertheid. "De nieuwe klonen EU-36 (Geel 36) en EU-37 (dondergroen 370 verdringen de ook al lastig te bestrijden EU-13 (blauw 13). De middelkeuze, dosering en timing van de bespuitingen komen dus nog preciezer in aanwezigheid van deze twee nieuwe klonen dan tijdens de situatie van zo'n twee jaar geleden, benadrukken de phytophthoraspecialisten.

    Development of a new biological control product for powdery mildew control in cereals
    Köhl, J. ; Plas, C.H. ; Bosch, G.B.M. van den; Goossen-van de Geijn, H.M. ; Haas, B.H. de; Schepers, H.T.A.M. ; Hilscher, U. ; Wikström, M. ; Zijlstra, C. - \ 2018
    In: Biocontrol products: From lab testing to product development. - IOBC-WPRS
    Fungicide evaluation to rate the efficacy to control early blight for the EuroBlight table
    Evenhuis, A. ; Hausladen, H. ; Nielsen, B.J. ; Berg, W. van den; Schepers, H.T.A.M. - \ 2018
    Lelystad : Wageningen University and Research, P-AGV (Confidential Wageningen Plant Research Report 3750328100) - 28 p.
    Agronomics and economics of late blight control in potato in West Java, Indonesia
    Schepers, H.T.A.M. ; Gunadi, N. ; Brink, L. van den; Moekasan, T.K. ; Prabaningrum, L. ; Karjadi, A.K. ; Putter, H. de - \ 2018
    In: Proceedings of the 2nd Asian Horticultural Congress. - International Society for Horticultural Science (Acta Horticulturae ) - ISBN 9789462612051 - p. 369 - 373.
    Adjuvant - Fungicide - Phytophthora infestans - Solanum tuberosum - ‘Atlantic’ - ‘Granola’

    Indonesia is the largest potato producer in Southeast Asia. Late blight (Phythophtora infestans) is one of the most important diseases especially in the rainy season. Therefore, farmers frequently spray fungicides to prevent infection. Forty farmers in West Java were trained in implementing good agricultural practices. To assess the impact of the training, late blight control strategies at the trainees’ fields were recorded. The baseline registration in the dry season of 2013 revealed that on average 16.6 times fungicides were applied. The average spray volume was 919 L ha-1, whereas the recommended spray volume ranges from 400 to 600 L ha-1 depending on the crop stage. Many farmers added an adjuvant to the spray mixture to increase the rainfastness of the fungicides. The fungicide costs ranged from 11.4 to 14.7% of the total production costs. The second registration, wet season of 2013/2014, showed a similar number of applications as in the dry season but the fungicide input was clearly higher due to a higher spray volume of 1,052 L ha-1 and more fungicides per application which caused higher fungicide costs ranging from 4 to 35% of the total production costs. Parallel and supportive to the trainings, three late blight demos were implemented in wet seasons. In the first demo (2013/2014), more recently registered fungicides controlled late blight similarly compared to the fungicide mixture often used by farmers, but they were 10-15% more expensive. In the second (2014/2015) and third demo (2015/2016), again the more recently registered fungicides did not perform better and were more expensive. A 20% reduction in spray volume had a similar effect on late blight control as the farmers’ practice using high volumes. At reduced spray volumes, the use of an adjuvant did increase late blight control. It is estimated that the spray volume can be reduced with 10-20% without loss of efficacy and thus save costs.

    Extra alert zijn op agressieve klonen
    Schepers, H.T.A.M. - \ 2018
    Snelle opmars van mogelijk agressieve phytophthoraklonen vraagt extra alertheid
    Schepers, H.T.A.M. - \ 2018
    Succesvolle studiedag KNPV-werkgroep FRAG-NL rondom fungicidenresitentie
    Schepers, H. ; Elberse, I. - \ 2018
    Gewasbescherming 49 (2018)4/5/6. - ISSN 0166-6495 - p. 111 - 117.
    Reduced efficacy of fluazinam against Phytophthora infestans in the Netherlands
    Schepers, H.T.A.M. ; Kessel, G.J.T. ; Lucca, F. ; Förch, M.G. ; Den Bosch, G.B.M. van; Topper, C.G. ; Evenhuis, A. - \ 2018
    European Journal of Plant Pathology 151 (2018)4. - ISSN 0929-1873 - p. 947 - 960.
    AUDPC - Clonal lineage - Control strategy - Fungicides - Late blight - Potato - Shirlan
    Phytophthora infestans is the causal organism of potato late blight, the most important disease in potato, the second most important arable crop in Europe. The P. infestans population in Europe is well known for its sudden changes in composition. Currently it is composed of a wide variety of genotypes, some of which are dominant clonal lines while others are rare or even unique to a year or location. Fungicides play a crucial role in the integrated control of late blight. Since its introduction in the Netherlands in 1992, fluazinam has been used in late blight control strategies in ware and starch potatoes. It has a broad spectrum of activity and is effective against a range of diseases including potato late blight. Fluazinam interrupts the pathogen cell’s energy production process by an uncoupling effect on oxidative phosphorylation. It is considered to have a low resistance risk. Until recently, reduced efficacy against fluazinam was not detected in P. infestans surveys in Europe. In this paper we present the finding of a new clonal lineage (EU_33_A2) of P. infestans in the Netherlands and the reduced efficacy of fluazinam to control one of the EU_33_A2 isolates in field experiments carried out in 2011 and 2015 under high disease pressure. The potential effects of this finding on practical late blight control strategies are discussed.
    Proceedings of the sixteenth EuroBlight workshop : Aarhus - Denmark, 14-17 May 2017
    Schepers, H.T.A.M. - \ 2017
    Lelystad : Applied Arable and Vegetable Research (PAGV-special report no. 18) - 300
    Geodata To Control Potato Late Blight In Bangladesh
    Kessel, G. ; Moene, A.F. ; Valkengoed, E. van; Voet, P. van der; Michielsen, J.M. ; Ahsan, H. ; Schmelzer, T. ; Maroof, M. ; Syed, A. ; Hengsdijk, Huib - \ 2017
    In: Proceedings of the sixteenth EuroBlight Workshop. - Wageningen : Wageningen University & Research, Praktijkonderzoek AGV (PAGV-Special Report 18) - p. 59 - 60.
    Netherlands public private partnerships aimed at Co-innovation in the potato value chain in emerging markets
    Kempenaar, C. ; Blom-Zandstra, M. ; Brouwer, T.A. ; Putter, H. De; Vries, S. De; Hengsdijk, H. ; Janssens, S.R.M. ; Kessel, G.J.T. ; Koesveld, J.M. Van; Meijer, B.J.M. ; Pronk, A.A. ; Schoutsen, M. ; Beke, F. Ter; Brink, L. Van Den; Michielsen, J.M. ; Schepers, H.T.A.M. ; Wustman, R. ; Zhang, X. ; Qiu, Y.T. ; Haverkort, A.J. - \ 2017
    Open Agriculture 2 (2017)1. - ISSN 2391-9531 - p. 544 - 551.
    Economic affairs - Industrial consortia - Interdisciplinary research
    Since 2013 the Netherlands Ministries of Economic and Foreign Affairs has been involved in private companies in research and development (R&D) in developing countries. This in a policy going “from aid to trade”. Especially in upcoming markets, R&D is carried out through Public Private Partnerships. Such partnerships not only include R&D organizations in the two countries but specifically also include businesses in both countries. This was to assure a logical flow of material and knowledge by all parties involved. Half of an R&D project is funded by the ministry and the rest is covered by a consortium of companies that contribute in kind and in cash. The policy is aimed at stimulating business development in developing countries and the Netherlands through cooperation and joint R&D. The paper explains how eleven consortia around potato business opportunities were formed, their R&D need was elicited and R&D projects formulated in the Asian countries China, India, Indonesia, Vietnam, Bangladesh and Myanmar, and Ethiopia and Kenya in Africa. In common are fact finding and descriptions of cropping systems, yield gap analysis and value chains in each country. Emphases differ with China looking for an integrated system of field operations, India for optimization of storage and processing, Indonesia to reduce pesticide and nutrient inputs, Vietnam for widening the varietal base, Bangladesh for combating late blight, Myanmar for cultural practices that lead to increased yield, Ethiopia where a potato processing unit is being established and Kenya importing seed potato from the Netherlands. Some content information is given as examples to illustrate the approach and some preliminary conclusion are discussed.
    Fungicide evaluation to rate efficacy to control leaf late blight for the EuroBlight table
    Evenhuis, A. ; Bain, R. ; Hausladen, H. ; Nielsen, B. ; Berg, W. van den; Schepers, H.T.A.M. - \ 2017
    Wageningen : Wageningen Plant Research - 50 p.
    Netwerk Euroblight actualiseert bestrijding alternaria
    Schepers, H.T.A.M. - \ 2017
    Netwerk Euroblight actualiseert bestrijding van alternaria
    Schepers, H.T.A.M. - \ 2017
    Middel niet altijd op goede plek
    Schepers, H.T.A.M. - \ 2017
    New solutions for foliar infection
    Schepers, H.T.A.M. - \ 2017
    EU-37 verminderd gevoelig voor fluazinam
    Schepers, H.T.A.M. - \ 2017
    Phytophthorastam minder gevoelig voor fluazinam
    Schepers, H.T.A.M. - \ 2017
    Oprukkende Phytophthora-stam EU-37 minder gevoelig voor middel fluazinam
    Schepers, H.T.A.M. - \ 2017
    Phytophthorastam EU-37 minder gevoelig voor fluazinam
    Schepers, H.T.A.M. - \ 2017
    Nieuwe fysio minder gevoelig
    Schepers, H.T.A.M. - \ 2017
    Phytophthorastammen EU-36 en EU-37 rukken op
    Schepers, Huub - \ 2017
    Lastig kiezen in oerwoud van hulpstoffen
    Schepers, Huub - \ 2017
    Phytophthoratabel 2017 weer verder aangescherpt
    Schepers, Huub ; Evenhuis, Bert - \ 2017
    Effect of structural animal health planning on antimicrobial use and animal health variables in conventional dairy farming in the Netherlands
    Speksnijder, David C. ; Graveland, Haitske ; Eijck, Ineke A.J.M. ; Schepers, René W.M. ; Heederik, Dick J.J. ; Verheij, Theo J.M. ; Wagenaar, Jaap A. - \ 2017
    Journal of Dairy Science 100 (2017)6. - ISSN 0022-0302 - p. 4903 - 4913.
    Antimicrobial use - Continuous improvement - Facilitated animal health planning - Implementation

    Widespread veterinary use of antimicrobials might contribute to the increasing burden of antimicrobial resistance. Despite many successful efforts to reduce veterinary antimicrobial use in the Netherlands, antimicrobial use on a substantial number of farms has remained relatively high over the past few years. Farm-specific solutions are required to further lower antimicrobial use on these farms. Reducing the burden of animal diseases at the farm level by means of a structured approach to animal health planning could be promising. This intervention study aimed to evaluate the main effects of an animal health planning program developed by an advisory team consisting of a dairy farmer, his veterinarian, and his feed adviser under the guidance of a professional facilitator. During an initial farm visit, the advisory team developed a farm-specific animal health planning program with support from the facilitator. After 1 yr, the effects of this program on animal health, production parameters, and antimicrobial use were evaluated and compared with control farms that did not have a facilitated animal health planning program. Antimicrobial use on intervention farms was significantly reduced between the start and the end of the study period; however, no significant differences in the rate of reduction between the intervention and control groups could be observed (-19% and -14%, respectively). Reduced antimicrobial use did not result in negative effects on animal health and production parameters during the study period in both groups. On intervention farms, a significant positive relationship was found between the percentage of completed action points at farm level and the percentage reduction in antimicrobial use. The level of compliance with action points and the quality of collaboration between farmer and advisers were positively associated with the accomplishment of corresponding objectives. However, the total number of objectives was negatively associated with the level of compliance with action points and tended to be negatively associated with the percentage reduction in antimicrobial use at farm level. Gradually reducing antimicrobial use without adverse effects on animal health and productivity is possible by adjusting management practices in a team effort. Fostering good collaboration among farmer, veterinarian, and feed adviser and focusing on a limited number of objectives have positive effects on the outcomes of the animal health planning program and antimicrobial use.

    Towards a ‘next level’ IPM approach for potato late blight management.
    Kessel, Geert Jan - \ 2016
    Geert Kessel, Jack Vossen, Ronald Hutten, Bert Lotz, Huub Schepers, Bert Evenhuis and Anton Haverkort, 10 January 2016. Towards a ‘next level’ IPM approach for potato late blight management.
    Late blight situation in Europe and ongoing projects
    Schepers, H.T.A.M. ; Lees, A. ; Gronbech Hansen, J. - \ 2016
    Best Agricultural practices and chemical control of potato late blight in Europe
    Schepers, H.T.A.M. ; Lees, A. ; Gronbech Hansen, J. - \ 2016
    - p. 10 - 14.
    Results of potato late blight demonstrations in Pangalengan, Indonesia: November 2016 - February 2016
    Schepers, H.T.A.M. ; Gunadi, N. ; Putter, H. de; Moekasan, T.K. ; Prabaningrum, L. ; Karjadi, A.K. - \ 2016
    vegIMPACT (vegIMPACT Report 33) - 17 p.
    Agronomics and economics of late blight control in potato in West Java, Indonesia
    Schepers, H.T.A.M. ; Gunadi, N. ; Brink, L. van den; Moekasan, T.K. - \ 2016
    - p. 136 - 136.
    Fungicide evaluation to rate efficacy to control leaf late blight for the EuroBlight table Results 2006-2015
    Evenhuis, A. ; Bain, R. ; Hausladen, H. ; Nielsen, B.J. ; Berg, W. van den; Schepers, H.T.A.M. - \ 2016
    Lelystad : Applied Plant Research - 46
    solanum tuberosum - potatoes - plant pathogenic fungi - oomycetes - phytophthora infestans - fungicides - protocols - field experimentation - europe - solanum tuberosum - aardappelen - plantenziekteverwekkende schimmels - oömyceten - phytophthora infestans - fungiciden - protocollen - experimenteel veldonderzoek - europa
    Effect of adjuvant and spray volume on the rainfastness and biological efficacy of mancozeb in potato and onion
    Schepers, H.T.A.M. ; Putter, H. de; Topper, C.G. ; Adiyoga, W. ; Gunadi, N. ; Evenhuis, A. - \ 2016
    - p. 147 - 153.
    Processing industry should open up the potato sector of Argentina
    Schepers, Huub ; Vries, Sicko de - \ 2016
    Alternaria geeft onrust bij telers
    Schepers, Huub ; Ampt-de Jong, Marieke ; Brouwer, Thie Arend ; Tramper, Marcel - \ 2016
    Extra aandacht voor Alternaria bij Belchim
    Schepers, Huub ; Tramper, Marcel - \ 2016
    The emotional influence of flowers on social perception and memory : An exploratory study
    Mojet, J. ; Köster, E.P. ; Holthuysen, N.T.E. ; Veggel, R.J.F.M. Van; Wijk, R.A. De; Schepers, H.E. ; Vermeer, F. - \ 2016
    Food Quality and Preference 53 (2016). - ISSN 0950-3293 - p. 143 - 150.
    Emotive projection test - Incidental memory - People's perception of others

    Background Flowers are reported to have immediate and long-term effects on health and well-being, emotional reactions, mood, social behaviour and memory, but emotional effects have rarely been studied in more detail. Methods This study investigated the influences of flowers on emotional perception of others in healthy adults (n = 64), divided over 4 conditions (3 flower arrays and a flowerless control). The test included a projection test judging pictures of people. One week later memory regarding pictures in the projection test, roommates and the room they had been in, was tested. Results Flowers, positively affected peoples’ mood and their perception of others. With flowers, pictures of other people were judged more positively and less negatively than without flowers. Odorous flowers had a more negative effect. The people in the pictures seemed a bit more open, but clearly less friendly, more arrogant and more depressed under its influence. Furthermore, flowers had a positive influence on the remembrance of the room the participants had been in. Conclusion Flowers exert a more positive influence by their visual appearance than by their odour, and act more on people's feelings towards unknown others than on liking of the food they eat, whereas flowers have little impact on remembering eating situation aspects. Practical implication The use of flowers might perhaps be recommended for increasing relaxation and mutual understanding in public places (restaurants (non-odorous flowers), meeting rooms and waiting rooms).

    Recirculeren bij spoelen en ontsmetten kisten
    Riemens, Marleen ; Schepers, Huub - \ 2016
    PPO-WUR roept sector op masterplan Alternaria te starten
    Schepers, Huub - \ 2016
    Alternaria: wissel fungiciden af
    Schepers, Huub - \ 2016
    Verwerkende industrie moet aardappelsector Argentinië lostrekken
    Schepers, Huub - \ 2016
    Effect of adjuvant and spray volume on mancozeb residue on potato and onion leaves and on Phythophthora infestans in potato and Peronospora destructor in onion
    Putter, H. de; Schepers, H.T.A.M. ; Topper, C.G. ; Evenhuis, A. - \ 2016
    Wageningen : Wageningen UR (vegIMPACT Report 21) - 21
    arable farming - vegetable growing - outdoor cropping - potatoes - onions - laboratory tests - solanum tuberosum - allium cepa - plant protection - pesticides - akkerbouw - groenteteelt - vollegrondsteelt - aardappelen - uien - laboratoriumproeven - solanum tuberosum - allium cepa - gewasbescherming - pesticiden
    As part of the vegIMPACT project a laboratory test in the Netherlands was done with potato (Solanum tuberosum) var. Bintje and onion (Allium cepa) var. Sturon. In both crops mancozeb was sprayed with and without the adjuvants Bond and Indostick. In both crops these three treatments were applied with high and low spray volumes. After spraying, rain was simulated (0.5, 3 or 6 hours after spraying and a control without rain) to test the sticker properties. After five days, plant leaves were analysed on mancozeb residue. Five days after spraying the potato plants were inoculated with Phytophthora infestans and onions with Peronospora destructor. Subsequently, disease symptoms were observed and visually rated as percentage of infected leaves. In potato lower mancozeb residue levels were measured at high spray volumes. Under dry conditions the effect of adjuvant on mancozeb residue in potato was limited. In onion the spreader characteristics of the adjuvants resulted in higher mancozeb residue concentrations than without adjuvant. The impact of rain simulation was much bigger than the impact of adjuvant on mancozeb residue and late blight incidence. Therefore, it is not recommended to spray when rain is expected within the same day as spraying. With rain simulation in both onion and potato more mancozeb residue was present when using the adjuvant Bond than when spraying mancozeb without an adjuvant. However, also with Bond after rain simulation high amounts of mancozeb were washed off. Mancozeb with Bond in potato resulted in less late blight incidence than with spraying mancozeb without adjuvants. Overall the adjuvant Bond performed better than Indostick in terms of mancozeb retention on both potato and onion leaves . Indostick had good spreading properties that under dry conditions resulted in higher mancozeb residue levels in onion. Under rainy conditions the effect of Indostick on mancozeb residues was not or only slightly better than mancozeb without adjuvant.
    6.3 Schimmels Loofziekten
    Schepers, H.T.A.M. - \ 2015
    Wageningen Plant Research
    Proceedings of the fifteenth EuroBlight Workshop : Brasov-Romania 13-15 May 2015
    Schepers, H.T.A.M. - \ 2015
    Wageningen : Applied Plant Research (PPO-Special Report 17) - 250
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