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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Steeds agressievere Phytophtora vraagt nog preciezer werken
Schepers, Huub ; Kessel, Geert Jan - \ 2019
Steeds agressievere Phytophthora vraagt nog preciezer werken
Schepers, Huub ; Kessel, Geert Jan - \ 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 : (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, Huub - \ 2018
Snelle opmars van mogelijk agressieve phytophthoraklonen vraagt extra alertheid
Schepers, Huub - \ 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, Huub - \ 2017
Netwerk Euroblight actualiseert bestrijding van alternaria
Schepers, Huub - \ 2017
Middel niet altijd op goede plek
Schepers, Huub - \ 2017
New solutions for foliar infection
Schepers, Huub - \ 2017
EU-37 verminderd gevoelig voor fluazinam
Schepers, Huub - \ 2017
Phytophthorastam minder gevoelig voor fluazinam
Schepers, Huub - \ 2017
Oprukkende Phytophthora-stam EU-37 minder gevoelig voor middel fluazinam
Schepers, Huub - \ 2017
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