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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Stepwise screening of candidate antagonists for biological control of Blumeria graminis f. sp. tritici
Köhl, Jürgen ; Goossen van de Geijn, Helen ; Groenenboom de Haas, Lia ; Henken, Betty ; Hauschild, Rüdiger ; Hilscher, Ulrike ; Lombaers-van der Plas, Carin ; Bosch, Trudy van den; Wikström, Mariann - \ 2019
Biological Control 136 (2019). - ISSN 1049-9644
Antagonists - Biological control - Blumeria graminis f. sp. tritici - Powdery mildew - Risk assessment - Screening criteria - Tilletiospsis pallescens - Wheat

Antagonists for the biological control of Blumeria graminis f. sp. tritici were selected using a stepwise screening approach. Fungal colonizers of powdery mildew pustules were isolated from leaves of cereals and other plant species. Spore production, cold tolerance, drought tolerance and UV-B resistance as important characteristics for application of biocontrol candidates in the phyllosphere were tested in in vitro assays and preliminary risk assessments were conducted. Amongst 850 tested isolates 58% belonged to various taxonomical groups of Cladosporium. Only 3% belonged to species that have been reported in literature as antagonistic to powdery mildews. The stepwise screening approach allowed to reduce the number of candidate antagonists using screening criteria that can be tested reliably and cost-effectively in in vitro assays and by data mining from initially 1237 isolates down to 143 candidate antagonists belonging to 42 taxonomical groups. The potential of these isolates to reduce conidia production of B. graminis f. sp. tritici. in wheat was assessed in bioassays on potted winter wheat plants under controlled conditions. A set of ten superior isolates was subsequently tested in a series of trials on potted spring wheat plants under open field conditions. Isolates Tilletiopsis pallescens BC0441 and T. pallescens BC0850 significantly reduced the number of powdery mildew pustules per flag leaf by 30 to 62%. Slopes of the regression lines fitted to data on number of powdery mildew pustules during time were significantly reduced by the antagonists indicating that the powdery mildew epidemics were slowed down. Treatments with T. pallescens BC0441 and T. pallescens BC0850 also reduced leaf coverage with powdery mildew pustules in a small-scale field trial in spring wheat.

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
The structure of the Brassica napus seed microbiome is cultivar-dependent and affects the interactions of symbionts and pathogens
Rybakova, Daria ; Mancinelli, Ricardo ; Wikström, M. ; Birch-Jensen, Ann-Sofie ; Postma, J. ; Ehlers, Ralf-Udo ; Goertz, Simon ; Berg, Gabriele - \ 2017
Microbiome 5 (2017). - ISSN 2049-2618
Background
Although the plant microbiome is crucial for plant health, little is known about the significance of the seed microbiome. Here, we studied indigenous bacterial communities associated with the seeds in different cultivars of oilseed rape and their interactions with symbiotic and pathogenic microorganisms.
Results
We found a high bacterial diversity expressed by tight bacterial co-occurrence networks within the rape seed microbiome, as identified by llumina MiSeq amplicon sequencing. In total, 8362 operational taxonomic units (OTUs) of 40 bacterial phyla with a predominance of Proteobacteria (56%) were found. The three cultivars that were analyzed shared only one third of the OTUs. The shared core of OTUs consisted mainly of Alphaproteobacteria (33%). Each cultivar was characterized by having its own unique bacterial structure, diversity, and proportion of unique microorganisms (25%). The cultivar with the lowest bacterial abundance, diversity, and the highest predicted bacterial metabolic activity rate contained the highest abundance of potential pathogens within the seed. This data corresponded with the observation that seedlings belonging to this cultivar responded more strongly to the seed treatments with bacterial inoculants than other cultivars. Cultivars containing higher indigenous diversity were characterized as having a higher colonization resistance against beneficial and pathogenic microorganisms. Our results were confirmed by microscopic images of the seed microbiota.
Conclusions
The structure of the seed microbiome is an important factor in the development of colonization resistance against pathogens. It also has a strong influence on the response of seedlings to biological seed treatments. These novel insights into seed microbiome structure will enable the development of next generation strategies combining both biocontrol and breeding approaches to address world agricultural challenges.
BIOCOMES (EU project 612713) develops new biological control products for Integrated Pest Management in agriculture and forestry
Köhl, J. ; Zingg, D. ; Benuzzi, M. ; Ehlers, R.U. ; Perdrix Sapina, V. ; Eiben, U. ; Rosemeyer, V. ; Wikstrom, M. ; Azzaro, A. ; Glazer, I. ; O'Tuama, P. ; Tomanovic, Z. ; Tamm, L. ; Hauschild, R. ; Antonakou, M. ; Skrzecz, I. ; Cal, A. De; Teixidó, N. ; Jehle, J. ; Griffin, C. ; Beliën, T. ; Birnstingl, B. ; Berg, G. ; Simões, N. ; Causin, R. ; Munoz, D. ; Eibl, R. - \ 2016
In: Working Group "Biological and Integrated Control of Plant Pathogens" / Pertot, I., Jensen, D.F., Hökeberg, M., Karlsson, M., Sundh, I., Elad, Y., IOBC-WPRS (IOBC-WPRS bulletin ) - ISBN 9789290672999 - p. 251 - 253.
BIOCOMES (EU project 612713) develops new biological control products for Integrated Pest Management in agriculture and forestry
Köhl, J. ; Zingg, D. ; Benuzzi, M. ; Ehlers, R.U. ; Perdrix, V. ; Eiben, U. ; Rosemeyer, V. ; Wikström, M. ; Azzaro, A. ; Glazer, I. ; O'Tuama, P. ; Tomanovic, Z. ; Tamm, L. ; Hauschild, R. ; Antonakou, M. ; Skrzecz, I. ; Cal, A. De; Teixidó, N. ; Jehle, J. ; Griffin, C. ; Beliën, T. ; Birnstingl, B. ; Berg, G. ; Simões, N. ; Causin, R. ; Muñoz, D. ; Eibl, R. - \ 2014
BIOCOMES (EU-Projekt 612713) entwickelt neue biologische Pflanzenschutzmittel für IPM in Land- und Forstwirtschaft (BIOCOMES (EU project 612713) develops new biological control products for IPM in agriculture and forestry)
Köhl, J. ; Zingg, D. ; Benuzzi, M. ; Ehlers, R.U. ; Perdrix, V. ; Eiben, U. ; Rosemeyer, V. ; Wikström, M. ; Azzaro, A. ; Glazer, I. ; O'Tuama, P. ; Tomanovic, Z. ; Tamm, L. ; Hauschild, R. ; Antonakou, M. ; Skrzecz, I. ; Cal, A. De; Teixidó, N. ; Jehle, J. ; Griffin, C. ; Beliën, T. ; Birnstingl, B. ; Berg, G. ; Simões, N. ; Causin, R. ; Muñoz, D. ; Eibl, R. - \ 2014
In: Poster Biologischer Pflanzenschutz. 59. Deutsche Pflanzenschutztagung "Forschen – Wissen – Pflanzen schützen: Ernährung sichern!" 23. bis 26. September 2014, Freiburg. - Germany : Julius Kühn-Institut - p. 458 - 459.
Evaluation of non-chemical seed treatment methods for control of Alternaria brassicicola on cabbage seeds
Amein, T. ; Wright, S. Al; Wikstrom, M. ; Koch, E. ; Schmitt, A. ; Stephan, D. ; Jahn, M. ; Tinivella, F. ; Gullino, M.L. ; Forsberg, G. ; Werner, S. ; Wolf, J.M. van der; Groot, S.P.C. - \ 2011
Journal of Plant Diseases and Protection 118 (2011)6. - ISSN 1861-3829 - p. 214 - 221.
vegetable seed - carrot seed - cauliflower - antagonists - fungicides - biocontrol - hot
Due to the lack of foliar fungicide use, the organic production of Brassica seeds free of Alternaria spp. is difficult. Therefore, effective seed treatments certified for use in organic farming are needed to eradicate or at least effec­tively reduce the seed-borne inoculum. We here report results of greenhouse and field experiments in which non-chemical seed treatments were tested for control of A. brassicicola on cabbage seeds naturally infested with the pathogen. In greenhouse experiments, significant improvements were obtained by seed treatment with some commercialised and experimental microbial biocontrol agents, an emulsion of thyme oil in water (0.1%) and by the tested physical seed treatments methods ( i.e. hot water, aerated steam and electron seed treatment). Resistance inducers tended to increase the percentage of healthy plants, but the effects were statistically not significant. Generally the combination of physical treatments with the effective agents did not result in improved performance. Positive effects on crop establishment and yield by the same treatments were also observed in field tests. Overall the results indicate that several options for non-chemical control of A. brassicicola on Brassica seeds exist that are comparable in efficacy to the chemical standard Aatiram (active ingredient thiram) used in this study. german version
Black spots caused by Rhexocercosporidium carotae on cold stored carrots in Sweden
Wikström, M. ; Ragnarsson, S. ; Jönsson, B. ; Köhl, J. ; Arvidsson, A.K. ; Burgers, S.L.G.E. ; Haas, B.H. de; Lombaers-van der Plas, C.H. - \ 2011
In: Book of Abstracts. International Congress of Postharvest Pathology, Lleida, Spain, 11-14 April 2011. - Lleida, Spain : Universitat de Lleida, IRTA, Government of Catalonia - p. 72 - Oeed8.
Black spots on carrots are a major problem in cold stored carrots leading to significant postharvest losses. Black spot symptoms can be caused by different pathogens. In Sweden, Rhexocercosporidium carotae (syn. Acrothecium carotae) was identified as the most important storage pathogen of carrots.
Black spots caused by Rexocercosporidium carotae (syn. Acrothecium carotae) on cold stored carrots
Wikström, M. ; Ragnarsson, S.A. ; Jönsson, B. ; Köhl, J. ; Arvdisson, A.K. ; Burgers, S.L.G.E. ; Groenenboom-de Haas, B.H. ; Haraldsson, T. ; Persson, L. - \ 2010
STOVE: Seed treatments for organic vegetable production
Schmitt, A. ; Jahn, M. ; Kromphardt, C. ; Krauthausen, H.J. ; Roberts, S.J. ; Wright, S.A.I. ; Amein, T. ; Forsberg, G. ; Tinivella, F. ; Gullino, M.L. ; Wikström, M. ; Wolf, J.M. van der; Groot, S.P.C. ; Werner, S. ; Koch, E. - \ 2008
biologische landbouw - zaadproductie - onderzoeksprojecten - groenteteelt - organic farming - seed production - research projects - vegetable growing
The aim of the EU-financed research project „STOVE“ (Seed Treatments for Organic Vegetable Production) is to evaluate different methods potentially suited for seed treatment of vegetables in organic farming regarding their efficacy, to optimise these methods, and where feasible to combine them with each other. Scientists from seven European research institutions and a producer of organic vegetable seeds carry out the project.
The need for a supply of high quality organic vegetable seeds
Schmitt, A. ; Jahn, M. ; Kromphardt, C. ; Krauthausen, H.J. ; Roberts, S.J. ; Wright, S.A.J. ; Amein, T. ; Forsberg, G. ; Tinivella, F. ; Guliino, M.L. ; Wikstrom, M. ; Wolf, J.M. van der; Groot, S.P.C. ; Werner, S. ; Koch, E. - \ 2006
In: The first Joint European Organic Congress, Odense, Denmark, 30 - 31 May, 2006. - Odense, Denmark : - p. 414 - 415.
Non-chemical methods of seed treatment for control of seed-borne pathogens on vegetables
Amein, T. ; Wright, S.A.I. ; Wikström, M. ; Schmitt, A. ; Koch, E. ; Wolf, J. ; Groot, S.P.C. ; Forsberg, G. ; Werner, S. ; Jahn, M. - \ 2006
biologische landbouw - zaadproductie - zaadbehandeling - gewasbescherming - biologische bestrijding - organic farming - seed production - seed treatment - plant protection - biological control
Posterpresentation: The EU-project "Seed Treatments for Organic Seed Production" (QLK5-2002-02239 STOVE) was initiated in March 2003. The project aim is to evaluate non-chemical methods for control of seed-borne pathogens in organic vegetable production. Both fysical and biological methods are being investigated. The former include hot air, hot water and electron treatment, while the latter compromise formulated commercialised microbial preparations, resistance inducers, non-commercialised antagonistic micro-organisms and plant extracts/compounds of natural origin.
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