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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Social media hypes about agro-food issues : Activism, scandals and conflicts
Stevens, T.M. ; Aarts, N. ; Termeer, C.J.A.M. ; Dewulf, A. - \ 2018
Food Policy 79 (2018). - ISSN 0306-9192 - p. 23 - 34.
Activism - Conflict - Hype - Livestock - Scandal - Social media

Events and controversies in the agro-food domain frequently generate peak selective activity on social media. These social media hypes are a concern to stakeholders because they can affect public opinion and policy, and are almost impossible to predict. This study develops a model for analysing social media hypes and builds a typology to provide insights into the dynamics of social media hypes in the context of agro-food governance. Five cases of peak social media activity in the Dutch livestock sector are analysed along four dimensions: (1) peak patterns of activity, (2) issues and frames, (3) interaction of actors, and (4) media interplay. An analysis of the dimensions and the interrelations across cases shows that social media hypes revolve around activism, scandals, and conflicts – each with characteristic patterns of activity, framing, interaction and media interplay. Hypes do not just result from important events in the sector, but are generated through the use of organizing concepts with a hashtag to evaluate and establish occasions. Peak activity thus revolves around a few themes and is recurrent and judgmental. Moreover, stakeholders play an active role in instigating and framing social media hypes. Our results show the need to adopt a proactive and interactive approach that transcends the view of social media as a mere communication channel to respond in crisis situations.

Oostvaardersplassen: analyse discussie in sociale media
Mattijssen, T.J.M. ; Breman, B.C. ; Stevens, T.M. - \ 2018
Nature Today
Survival of Ralstonia solanacearum and Ralstonia pseudosolanacearum in drain water
Stevens, L.H. ; Zouwen, P.S. van der; Tongeren, C.A.M. van; Kastelein, P. ; Wolf, J.M. van der - \ 2018
EPPO Bulletin 48 (2018)1. - ISSN 0250-8052 - p. 97 - 104.
The survival in drain water of two strains of Ralstonia solanacearum and three strains of Ralstonia pseudosolanacearum, including two strains able to cause wilt in roses, was determined. Water draining from drip-irrigated rock wool mats on which roses were grown was supplemented with the pathogen and survival was monitored at 4, 12, 20 and 28°C for up to 112 days. All strains were able to survive for at least 112 days in drain water at 12 and 20°C, but at 4°C maximum survival was 56 days. At 28°C, the survival period was strain dependent, but was at least 56 days. Populations declined gradually in non-sterile drain water to a low level (maximum 100 cfu mL−1 after 112 days). In sterile drain water (autoclaved prior to addition of populations), no or only a limited decline in populations was found at 112 days, dependent on strain and temperature. Drain water that tested negative for Ralstonia in the dilution plating assay was tested for the presence of cells in a viable but non-culturable state (VBNCs). Tomato plants were inoculated, but no symptoms developed, and plants sampled 22 days post-inoculation were negative in a plating assay. Therefore, no indications were found that VBNCs were present.
Fysisch-chemische inductie van systemic acquired resistance (SAR): elicitors & stuurlicht
Stevens, L.H. ; Breeuwsma, S.J. ; Rutgers, B. ; Griekspoor, Y. ; Noordam, Marianne ; Vos, C.H. de; Schipper, A. ; Leiss, K.A. - \ 2018
Programmeringsstudie Meeldauw : Invloed van bestaande en nieuwe interventies op geïnduceerde weerbaarheid tegen biotrofe schimmel
Hofland-Zijlstra, J.D. ; Breeuwsma, S. ; Noordam, M. ; Stevens, L. - \ 2018
Bleiswijk : Wageningen University & Research, Business unit Glastuinbouw (Wageningen Plant Research rapport WPR-749) - 46
Purpose of this TKI project Programming study powdery mildew is to generate new knowledge about existingand new interventions aimed at prevention of mildew development in horticultural crops. This research isconducted by Wageningen University & Research greenhouse horticulture business unit. The project is supportedby LTO Glaskracht Nederland. To test the impact of existing interventions on the natural defenses of a plant testsin climate chamber were carried out with total daylight sum, CO2 and relative humidity. After three weeks theinfluence on the production of pathogen related proteins, which is a measure for induced resistance, was veryminor. However, it is confirmed that relative humidity and the daily light sum influence the mildew developmentdirectly and to a higher extent than the CO2. In addition, changes in nutritional composition of plants may be oneof the first indicators for enhanced disease risk (e.g. sodium).
Is mijn plant/gewas weerbaar?
Stevens, Luc - \ 2017
Beweiden of opstallen geeft financieel nauwelijks verschil
Pol-van Dasselaar, Agnes van den - \ 2017

Tussen bedrijven die beweiden of opstallen zijn beperkte economische verschillen te zien, maar meer typerend is dat de variatie enorm groot is. Dat betekent dat met beide systemen goede economische resultaten zijn te behalen.

Browse preference in bonobos
Hoore, C. D'; Bosch, G. ; Janssens, Geert P.J. ; Stevens, J. ; Pereboom, Z. ; Depauw, S. - \ 2017
Onderzoek richt zich op bodem en mineralen
Groten, Jos - \ 2017
Bio-based chemicals: general discussion
Bitter, Harry ; Clark, James ; Rothenberg, Gadi ; Matharu, Avtar ; Crestini, Claudia ; Argyropoulos, Dimitris ; Cabrera-Rodríguez, Carlos I. ; Dale, Bruce E. ; Stevens, Christian ; Marrocchi, Assunta ; Graca, Ines ; Luo, Hui ; Pant, Deepak ; Wilson, Karen ; Zijlstra, Douwe Sjirk ; Gschwend, Florence ; Mu, Xindong ; Zhou, Long ; Hu, Changwei ; Lapkin, Alexei ; Mascal, Mark ; Budarin, Vitaliy ; Hunt, Andrew ; Waldron, Keith ; Zhang, Fang ; Zhenova, Anna ; Samec, Joseph ; Huber, George ; Coma, Marta ; Huang, Xiaoming ; Bomtempo, José-Vitor - \ 2017
Faraday Discussions 202 (2017). - ISSN 1359-6640 - p. 227 - 245.
Global Goal Setting for Improving National Governance and Policy
Biermann, F. ; Stevens, C. ; Bernstein, S. ; Gupta, A. ; Kanie, N. ; Nilsson, M. ; Scobie, M. - \ 2017
In: Governing through Goals: Sustainable Development Goals as Governance Innovation / Kanie, Norichika, Biermann, Frank, Cambridge : MIT Press (Earth System Governance: A Core Research Project of the International Human Dimensions Programme on Global Environmental Change ) - ISBN 9780262035620 - p. 75 - 98.
Can better governance, in itself, be a subject for global goal setting? This question stands at the center of this chapter, which focuses on the inclusion of “governance goals” in global goal-setting mechanisms, especially the Sustainable Development Goals agreed upon by the UN General Assembly in September 2015 as part of its 2030 Agenda for Sustainable Development (UNGA 2015). While our discussion is inspired by the negotiations around governance goals and targets within the context of Sustainable Development Goals, we seek to build a broader analytic approach that goes beyond the integration of governance in this specific context.
Chemical Eradication of the Ring Rot Bacterium Clavibacter michiganensis subsp. sepedonicus on Potato Storage Crates
Stevens, L.H. ; Lamers, J.G. ; Zouwen, P.S. van der; Mendes, O. ; Berg, W. van den; Tjou-Tam-Sin, N.N.A. ; Jilesen, C.J.T.J. ; Spoorenberg, P.M. ; Wolf, J.M. van der - \ 2017
Potato Research 60 (2017)2. - ISSN 0014-3065 - p. 145 - 158.
Bacterium - Clavibacter michiganensis subsp. sepedonicus - Disinfection - Potato - Quarantine organism - Sodium-p-toluenesulfochloramide

Four commercially available disinfection products were tested for their efficacy against Clavibacter michiganensis subsp. sepedonicus (Cms), causative agent of bacterial ring rot, on wooden potato storage crates. Each of these products represented a different class of biocide, i.e. organic acids (benzoic acid), peroxygenous compounds (potassium peroxysulfate), quaternary ammonium compounds (didecyldimethylammoniumchloride) and hypochlorite-generating compounds (sodium-p-toluenesulfochloramide). The target objects consisted of small wooden panels that were smeared with potato tuber pulp homogenized with a high inoculum of Cms. By dipping the inoculated panels into the product solutions and subsequent determination of the densities of colony-forming units, the relative efficacy of the products was established. The two products that exhibited the highest relative efficacy were studied for their disinfection performance when applied as cleaning agent in a conventional automated crate washer. The results showed that jet cleaning in a crate washer for 2 min using the authorised dose of the product containing sodium-p-toluenesulfochloramide is an effective method for disinfecting Cms-contaminated wooden potato crates.

Expert Meeting Green Challenge Plantweerbaarheid en Sensoren
Hofland-Zijlstra, Jantineke - \ 2016
mmv Caroline van der Salm, Marjolein Kruidhof, Ellen Beerling, Tycho Vermeulen, Jochen Hemming, Carolien Zijlstra, Luc Stevens, Ric de Vos
Workshop Artemis Biostimulantia
Overbeek, Leo van - \ 2016
61. Achtergrond Werkingsmechanismen Biostimulanten. In Dutch. Leo van Overbeek en Luc Stevens.
Integrative analysis of results from the four countries
Stevens, P. ; Ouessar, Mohamed ; Sawadogo, M. ; Woldearegay, Kifle ; Wamunyima, Silenga ; Hessel, R. ; Grum, Berhane ; Fleskens, L. ; Kirkby, M. ; Irvine, Brian - \ 2016
Wahara project (Wahara report series 33) - 26 p.
WAHARA final publishable summary
Hessel, R. ; Ouessar, Mohamed ; Sawadogo, H. ; Woldearegay, Kifle ; Fleskens, L. ; Stevens, P. ; Steenbergen, F. van - \ 2016
Wahara project (Wahara report series 36) - 39 p.
Suite of dissemination products
Abhishek, Abraham ; Hessel, R. ; Fleskens, L. ; Steenbergen, F. van; Ouessar, Mohamed ; Sawadogo, H. ; Woldearegay, Kifle ; Wamunyima, Silenga ; Ritsema, C.J. ; Stevens, P. - \ 2016
Wahara project (Wahara report series 40) - 40 p.
Inzet ruwvoer als afleidingsmateriaal
Vermeer, Herman ; Bracke, Marc - \ 2016
A century of trends in adult human height
Bentham, James ; Cesare, Mariachiara Di; Stevens, Gretchen A. ; Geleijnse, J.M. ; Kromhout, D. - \ 2016
eLife 5 (2016). - ISSN 2050-084X - 29 p.
Being taller is associated with enhanced longevity, and higher education and earnings.
We reanalysed 1472 population-based studies, with measurement of height on more than 18.6 million participants to estimate mean height for people born between 1896 and 1996 in 200 countries. The largest gain in adult height over the past century has occurred in South Korean women and Iranian men, who became 20.2 cm (95% credible interval 17.5–22.7) and 16.5 cm (13.3–19.7) taller, respectively. In contrast, there was little change in adult height in some sub-Saharan African countries and in South Asia over the century of analysis. The tallest people over these 100 years are men born in the Netherlands in the last quarter of 20th century, whose average heights
surpassed 182.5 cm, and the shortest were women born in Guatemala in 1896 (140.3 cm; 135.8–144.8). The height differential between the tallest and shortest populations was 19-20 cm a century ago, and has remained the same for women and increased for men a century later despite substantial changes in the ranking of countries.
Trends in adult body-mass index in 200 countries from 1975 to 2014: a pooled analysis of 1698 population-based measurement studies with 19·2 million participants
Cesare, Mariachiara Di; Bentham, James ; Stevens, Gretchen A. ; Geleijnse, J.M. ; Kromhout, D. - \ 2016
The Lancet 387 (2016)10026. - ISSN 0140-6736 - p. 1377 - 1396.
Background Underweight and severe and morbid obesity are associated with highly elevated risks of adverse health outcomes. We estimated trends in mean body-mass index (BMI), which characterises its population distribution, and in the prevalences of a complete set of BMI categories for adults in all countries. Methods We analysed, with use of a consistent protocol, population-based studies that had measured height and weight in adults aged 18 years and older. We applied a Bayesian hierarchical model to these data to estimate trends from 1975 to 2014 in mean BMI and in the prevalences of BMI categories (<18·5 kg/m² [underweight], 18·5 kg/m² to <20 kg/m², 20 kg/m² to <25 kg/m², 25 kg/m² to <30 kg/m², 30 kg/m² to <35 kg/m², 35 kg/m² to <40 kg/m², ≥40 kg/m² [morbid obesity]), by sex in 200 countries and territories, organised in 21 regions. We calculated the posterior probability of meeting the target of halting by 2025 the rise in obesity at its 2010 levels, if post-2000 trends continue. Findings We used 1698 population-based data sources, with more than 19·2 million adult participants (9·9 million men and 9·3 million women) in 186 of 200 countries for which estimates were made. Global age-standardised mean BMI increased from 21·7 kg/m² (95% credible interval 21·3–22·1) in 1975 to 24·2 kg/m² (24·0–24·4) in 2014 in men, and from 22·1 kg/m² (21·7–22·5) in 1975 to 24·4 kg/m² (24·2–24·6) in 2014 in women. Regional mean BMIs in 2014 for men ranged from 21·4 kg/m² in central Africa and south Asia to 29·2 kg/m² (28·6–29·8) in Polynesia and Micronesia; for women the range was from 21·8 kg/m² (21·4–22·3) in south Asia to 32·2 kg/m² (31·5–32·8) in Polynesia and Micronesia. Over these four decades, age-standardised global prevalence of underweight decreased from 13·8% (10·5–17·4) to 8·8% (7·4–10·3) in men and from 14·6% (11·6–17·9) to 9·7% (8·3–11·1) in women. South Asia had the highest prevalence of underweight in 2014, 23·4% (17·8–29·2) in men and 24·0% (18·9–29·3) in women. Age-standardised prevalence of obesity increased from 3·2% (2·4–4·1) in 1975 to 10·8% (9·7–12·0) in 2014 in men, and from 6·4% (5·1–7·8) to 14·9% (13·6–16·1) in women. 2·3% (2·0–2·7) of the world’s men and 5·0% (4·4–5·6) of women were severely obese (ie, have BMI ≥35 kg/m²). Globally, prevalence of morbid obesity was 0·64% (0·46–0·86) in men and 1·6% (1·3–1·9) in women. Interpretation If post-2000 trends continue, the probability of meeting the global obesity target is virtually zero. Rather, if these trends continue, by 2025, global obesity prevalence will reach 18% in men and surpass 21% in women; severe obesity will surpass 6% in men and 9% in women. Nonetheless, underweight remains prevalent in the world’s poorest regions, especially in south Asia. Funding Wellcome Trust, Grand Challenges Canada.
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