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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Development and validation of IPM strategies for the cultivation of cisgenically modified late blight resistant potato
Kessel, Geert J.T. ; Mullins, Ewen ; Evenhuis, Albartus ; Stellingwerf, Jeroen ; Cortes, Vilma Ortiz ; Phelan, Sinead ; Bosch, Trudy van den; Förch, Marieke G. ; Goedhart, Paul ; Voet, Hilko van der; Lotz, Lambertus A.P. - \ 2018
European Journal of Agronomy 96 (2018). - ISSN 1161-0301 - p. 146 - 155.
Cisgenic modification - GM potato - Host resistance - Integrated pest management - Phytophthora infestans
Potato late blight disease remains the primary stressor of commercial potato production across the EU, typically requiring >10 fungicide applications per growing season to offset crop losses. In response, the goal of this study was to test and validate a novel, more durable, control strategy for potato late blight. This IPM2.0 strategy is based on the principles of Integrated Pest Management (IPM) which sees the deployment of a late blight resistant potato genotype, a cisgenically modified, Desiree based resistant potato line here, in conjunction with pathogen population monitoring for virulence to the resistance genes (R genes) deployed and a “do not spray unless”, low input fungicide spray strategy. Field evaluations were completed in the Netherlands and in Ireland in 2013, 2014 and in Ireland in 2015. Comparators used in this study included the original but susceptible potato variety Desiree and the conventional but highly resistant variety Sarpo Mira. The novel IPM2.0 strategy was compared to local common practice (fungicide applications on a near weekly basis) and an untreated control. Overall, the IPM2.0 control strategy validated here reduced the average fungicide input by 80–90% without compromising control efficacy. Corresponding environmental side-effects were reduced proportionally. The results underline the pragmatic role host resistance can provide to commercial potato production systems and to society at large if employed as part of an integrated late blight control system.
Associations of omega-3 fatty acid supplement use with cardiovascular disease risks meta-analysis of 10 trials involving 77 917 individuals
Aung, Theingi ; Halsey, Jim ; Kromhout, Daan ; Gerstein, Hertzel C. ; Marchioli, Roberto ; Tavazzi, Luigi ; Geleijnse, Johanna M. ; Rauch, Bernhard ; Ness, Andrew ; Galan, Pilar ; Chew, Emily Y. ; Bosch, Jackie ; Collins, Rory ; Lewington, Sarah ; Armitage, Jane ; Clarke, Robert - \ 2018
JAMA Cardiology 3 (2018)3. - ISSN 2380-6583 - p. 225 - 234.
IMPORTANCE Current guidelines advocate the use of marine-derived omega-3 fatty acids supplements for the prevention of coronary heart disease and major vascular events in people with prior coronary heart disease, but large trials of omega-3 fatty acids have produced conflicting results. OBJECTIVE To conduct ameta-analysis of all large trials assessing the associations of omega-3 fatty acid supplements with the risk of fatal and nonfatal coronary heart disease and major vascular events in the full study population and prespecified subgroups. DATA SOURCES AND STUDY SELECTION This meta-analysis included randomized trials that involved at least 500 participants and a treatment duration of at least 1 year and that assessed associations of omega-3 fatty acids with the risk of vascular events. DATA EXTRACTION AND SYNTHESIS Aggregated study-level datawere obtained from 10 large randomized clinical trials. Rate ratios for each trial were synthesized using observed minus expected statistics and variances. Summary rate ratios were estimated by a fixed-effects meta-analysis using 95%confidence intervals for major diseases and 99%confidence intervals for all subgroups. MAIN OUTCOMES AND MEASURES The main outcomes included fatal coronary heart disease, nonfatalmyocardial infarction, stroke, major vascular events, and all-cause mortality, as well as major vascular events in study population subgroups. RESULTS Of the 77 917 high-risk individuals participating in the 10 trials, 47 803 (61.4%) were men, and the mean age at entry was 64.0 years; the trials lasted a mean of 4.4 years. The associations of treatment with outcomes were assessed on 6273 coronary heart disease events (2695 coronary heart disease deaths and 2276 nonfatalmyocardial infarctions) and 12 001 major vascular events. Randomization to omega-3 fatty acid supplementation (eicosapentaenoic acid dose range, 226-1800mg/d) had no significant associations with coronary heart disease death (rate ratio [RR], 0.93; 99%CI, 0.83-1.03; P = .05), nonfatal myocardial infarction (RR, 0.97; 99%CI, 0.87-1.08; P = .43) or any coronary heart disease events (RR, 0.96; 95%CI, 0.90-1.01; P = .12). Neither did randomization to omega-3 fatty acid supplementation have any significant associations with major vascular events (RR, 0.97; 95% CI, 0.93-1.01; P = .10), overall or in any subgroups, including subgroups composed of persons with prior coronary heart disease, diabetes, lipid levels greater than a given cutoff level, or statin use. CONCLUSIONS AND RELEVANCE This meta-analysis demonstrated that omega-3 fatty acids had no significant association with fatal or nonfatal coronary heart disease or any major vascular events. It provides no support for current recommendations for the use of such supplements in people with a history of coronary heart disease.
Efficiency of organic stream conversion by black soldier fly larvae: a review of the scientific literature
Bosch, G. ; Veenenbos, M.E. ; Zanten, H.H.E. van; Meijer, N.P. ; Fels-Klerx, H.J. van der; Loon, J.J.A. van - \ 2018
Journal of Insects as Food and Feed 4 (2018)supplement 1. - ISSN 2352-4588 - p. S44 - S44.
Can insects synthesize vitamin D after exposure to ultraviolet light?
Oonincx, D.G.A.B. ; Keulen, P. van; Finke, M.D. ; Baines, F.M. ; Vermeulen, M. ; Bosch, G. - \ 2018
Journal of Insects as Food and Feed 4 (2018)Supplement 1. - ISSN 2352-4588 - p. S14 - S14.
Black soldier fly larvae to upcycle organic streams: a review of the scientific literature
Bosch, G. ; Veenenbos, M.E. ; Zanten, H.H.E. van; Meijer, N.P. ; Fels-Klerx, H.J. van der; Loon, J.J.A. van - \ 2018
Hoe ongezond is het om het voedsel van je huisdier zelf op te eten?
Bosch, Guido - \ 2018
The evolving protein landscape for pet foods
Bosch, G. - \ 2018
PETS International & Global Pets Community B.V.
Feed processing
Poel, A.F.B. van der; Vries, S. de; Bosch, G. - \ 2018
In: Feed evaluation science / Moughan, Paul J., Hendriks, Wouter H., Wageningen : Wageningen Academic Publishers - ISBN 9789086863099 - p. 295 - 336.
Aspects of comparative animal nutrition and the evaluation of pet foods
Hendriks, W.H. ; Bosch, G. - \ 2018
In: Feed evaluation science / Moughan, Paul J., Hendriks, Wouter H., Wageningen : Wageningen Academic Publishers - ISBN 9789086863099 - p. 491 - 524.
A systematic review of food-feed-fuel competition
Muscat, A. ; Ripoll Bosch, R. ; Olde, E.M. de; Boer, I.J.M. de - \ 2018
- 1 p.
Domestication and selection in livestock species tend to leave unique genomic imprints in the genome. Under intense selection pressure, these genomic regions show reduction in genetic diversity (runs of homozygosity, ROH). Analysis of ROH provides an informative indicator for inbreeding levels. Using genome-wide SNP data, we analysed six local goat breeds from Uganda to compare the distribution of ROH across different length categories within the breeds with a cut-off threshold of 2Mb. Genomic inbreeding was calculated using an ROH threshold of ≥2Mb for each individual and averaged across the breeds. We further investigated the variation in inbreeding at a higher ROH threshold of 4Mb and compared with the ROH threshold of ≥2Mb. A total of 1,437 ROH segments ≥ 2 Mb were detected with differing frequency and length distribution across the breeds. The Boer breed showed the highest overall frequency. Short ROH (< 8Mb) were generally more frequent than long ROH (> 20Mb). High ROH coverage within the short category may indicate a relatively high contribution of more distant inbreeding in the breeds. Indigenous breeds showed very low levels of genomic inbreeding (with the mean 퐹푅푂퐻 per breed ranging from 0.8% to 2.4%), as compared to higher inbreeding levels in Boer (mean 퐹푅푂퐻 = 13.9%).These findings are useful for providing insights into the demographic history and designing strategies for sustainable breeding programs and conservation strategies for the breeds.
Traditional ecological knowledge underlying herding decisions of pastoralists
Tamou, C. ; Boer, I.J.M. De; Ripoll-Bosch, R. ; Oosting, S.J. - \ 2018
Animal 12 (2018)4. - ISSN 1751-7311 - p. 831 - 843.
cattle - forage quality - grazing lands - pastoralism - soils
Pastoralists have traditional ecological knowledge (TEK), which is important for their livelihoods and for policies and interventions. Pastoralism is under pressure, however, which may result in a decline of pastoral lifestyle and its related TEK. We, therefore, addressed the following objectives (i) to inventorise and assess how pastoralists characterise and value soils and forages in their environment, (ii) to analyse how soil, forage and livestock (i.e. cattle) characteristics relate to herding decisions and (iii) to determine whether TEK underlying herding decisions differs across generations. Data were collected through focus groups and individual interviews with 72 pastoralists, belonging to three generations and to three agro-ecological zones. Using a three-point scale (high, medium, low), four grasses and three tree forages were assessed in terms of nutritional quality for milk, meat, health and strength. Using their own visual criteria, pastoralists identified five different soils, which they selected for herding at different times of the year. Pastoralists stated that Pokuri was the best soil because of its low moisture content, whereas Karaal was the worst because forage hardly grows on it. They stated that perennials, such as Andropogon gayanus and Loxoderra ledermannii, were of high nutritional quality, whereas annuals such as Andropogon pseudapricus and Hyparrhenia involucrata were of low nutritional quality. Afzelia africana was perceived of high quality for milk production, whereas Khaya senegalensis had the highest quality for meat, health and strength. Pastoralists first used soil, then forage and finally livestock characteristics in their herding decisions. Pastoralists' TEK was not associated with their generations, but with their agro-ecological zones. This study suggests that pastoralists had common and detailed TEK about soils, forages and livestock characteristics, underlying their herding decisions. To conclude, pastoralists use a holistic approach, combining soil, vegetation and livestock TEK in herding decisions. Such TEK can guide restoration or improvement of grazing lands, and land use planning.
Spotless strawberry plants: how to keep them free from Xanthomonas?
Wolf, J.M. van der - \ 2018
Xanthomonas fragariae (Xfr) is the causative agent of angular leaf spot of strawberry, a quarantine organism in Europe in plant propagation material (EPPO A2). Protected cultivation of strawberry plants in general resuIts in a pathogen free crop. However, if plants are grown in the field, infections occasionally occur which can result in high economic damage. Motile Xfr cells can enter the plants via wound or natural openings, in particular via stomata. The development of symptoms is favored by a high relative humidity and when temperatures are between 18-24 degrees Celsius. Under high-moisture conditions, bacteria can exude from lesions and provide secondary inoculum which can be dispersed in different ways.
Spotless strawberry plants: how to keep them free from Xanthomonas?
Wolf, Jan van der - \ 2018
Beheersing van suzuki-fruitvlieg in aardbeien
Helsen, Herman - \ 2018
Use of toxic baits for the control of Drosophila suzukii
Helsen, Herman - \ 2018
Promoting social cohesion and social capital increasing wellbeing
Elands, B.H.M. ; Peters, K.B.M. ; Vries, S. de - \ 2018
In: Oxford Textbook of Nature and Public Health / van den Bosch, Matilda, Bird, William, Oxford : Oxford University Press - ISBN 9780198725916 - p. 116 - 121.
Understanding roles and functions of cattle breeds for pastoralists in Benin
Tamou, Charles ; Boer, Imke J.M. de; Ripoll-Bosch, Raimon ; Oosting, Simon J. - \ 2018
Livestock Science 210 (2018). - ISSN 1871-1413 - p. 129 - 136.
AnGR - Cattle traits - Indigenous breeds - Pastoralists - Traditional knowledge
Animal genetic resources (AnGR) are essential for food security and the livelihoods of many pastoralists. However, the AnGR diversity is currently being eroded, as well as the traditional ecological knowledge associated to the use of indigenous breeds and their environment. The objectives of this study were to: i) inventorise indigenous breeds of cattle and their performance in selected traits, ii) analyse pastoralists’ preferences for specific breeds and reasons for that, and iii) determine whether the knowledge about breeds and their traits was transmitted across generations and was consistent across agro-ecological zones. Data were collected through focus groups discussions, and individual interviews with 72 pastoralists. Interviewees belonged to three generations and three agro-ecological zones in the periphery of the W Biosphere Reserve in Benin. From the focus groups discussions we identified the most common breeds in the region (i.e. Keteeji, Jaliji, Bodeji, Tchiwali and Gudali) and the most relevant traits (i.e. milk production, meat production, endurance and tolerance to trypanosomiasis) to assess cattle breeds according to pastoralists. Individual interviewees scored the performance of cattle breeds in the four main traits based on a three-point scale. Finally, we determined the consistency of pastoralists’ knowledge across generations and agro-ecological zones. Keteeji was valued for its endurance and tolerance to trypanosomiasis, Bodeeji was highly valued for endurance and Gudali was perceived of high value for meat and milk production, but of low value for endurance. Keteeji was the preferred breed by the majority of the pastoralists (nearly 50%), especially for the adaptive trait withstanding hunger. Gudali was the least preferred breed (11%). 80% of pastoralists selected a preferred cattle breed based on adaptive traits, i.e. withstanding hunger, intelligence (beyond obedience to herder) or withstanding disease. Pastoralists’ knowledge about breed traits did not differ among generations, but some differences appeared among agro-ecological zones. This study suggests that pastoralists prefer adaptive traits of breeds over production traits to deal with the changing and unfavourable conditions of their environment.
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 (2018). - ISSN 0929-1873 - p. 1 - 14.
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.
Veredeling moet cichorei nog gezonder maken
Bosch, Dirk - \ 2018
Stress and sexual reproduction affect the dynamics of the wheat pathogen effector AvrStb6 and strobilurin resistance
Kema, Gerrit H.J. ; Mirzadi Gohari, Amir ; Aouini, Lamia ; Gibriel, Hesham A.Y. ; Ware, Sarah B. ; Den Bosch, Frank van; Manning-Smith, Robbie ; Alonso-Chavez, Vasthi ; Helps, Joe ; M’Barek, Sarrah Ben; Mehrabi, Rahim ; Diaz-Trujillo, Caucasella ; Zamani, Elham ; Schouten, Henk J. ; Lee, Theo A.J. van der; Waalwijk, Cees ; Waard, Maarten A. de; Wit, Pierre J.G.M. de; Verstappen, Els C.P. ; Thomma, Bart P.H.J. ; Meijer, Harold J.G. ; Seidl, Michael F. - \ 2018
Nature Genetics 50 (2018). - ISSN 1061-4036 - p. 375 - 380.
Host resistance and fungicide treatments are cornerstones of plant-disease control. Here, we show that these treatments allow sex and modulate parenthood in the fungal wheat pathogen Zymoseptoria tritici. We demonstrate that the Z. tritici–wheat interaction complies with the gene-for-gene model by identifying the effector AvrStb6, which is recognized by the wheat resistance protein Stb6. Recognition triggers host resistance, thus implying removal of avirulent strains from pathogen populations. However, Z. tritici crosses on wheat show that sex occurs even with an avirulent parent, and avirulence alleles are thereby retained in subsequent populations. Crossing fungicide-sensitive and fungicide-resistant isolates under fungicide pressure results in a rapid increase in resistance-allele frequency. Isolates under selection always act as male donors, and thus disease control modulates parenthood. Modeling these observations for agricultural and natural environments reveals extended durability of host resistance and rapid emergence of fungicide resistance. Therefore, fungal sex has major implications for disease control.
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