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Mycotoxin Research

, Volume 33, Issue 3, pp 237–244 | Cite as

Biocontrol of the toxigenic plant pathogen Fusarium culmorum by soil fauna in an agroecosystem

  • Friederike Meyer-Wolfarth
  • Stefan Schrader
  • Elisabeth Oldenburg
  • Joachim Weinert
  • Joachim Brunotte
Original Article

Abstract

In 2011 and 2013, a field experiment was conducted in a winter wheat field at Adenstedt (northern Germany) to investigate biocontrol and interaction effects of important members of the soil food web (Lumbricus terrestris, Annelida; Folsomia candida, Collembola and Aphelenchoides saprophilus, Nematoda) on the phytopathogenic fungus Fusarium culmorum in wheat straw. Therefore, soil fauna was introduced in mesocosms in defined numbers and combinations and exposed to either Fusarium-infected or non-infected wheat straw. L. terrestris was introduced in all faunal treatments and combined either with F. candida or A. saprophilus or both. Mesocosms filled with a Luvisol soil, a cover of different types of wheat straw and respective combinations of faunal species were established outdoors in the topsoil of a winter wheat field after harvest of the crop. After a time span of 4 and 8 weeks, the degree of wheat straw coverage of mesocosms was quantified to assess its attractiveness for the soil fauna. The content of Fusarium biomass in residual wheat straw and soil was determined using a double-antibody sandwich (DAS)-ELISA method. In both experimental years, the infected wheat straw was incorporated more efficiently into the soil than the non-infected control straw due to the presence of L. terrestris in all faunal treatments than the non-infected control straw. In addition, Fusarium biomass was reduced significantly in all treatments after 4 weeks (2011: 95–99%; 2013:15–54%), whereupon the decline of fungal biomass was higher in faunal treatments than in non-faunal treatments and differed significantly from them. In 2011, Fusarium biomass of the faunal treatments was below the quantification limit after 8 weeks. In 2013, a decline of Fusarium biomass was observed, but the highest content of Fusarium biomass was still found in the non-faunal treatments after 8 weeks. In the soil of all treatments, Fusarium biomass was below the quantification limit. The earthworm species L. terrestris revealed a considerable potential as an effective biocontrol agent contributing to a sustainable control of a Fusarium plant pathogen in wheat straw, thus reducing the infection risk for specific plant diseases in arable fields.

Keywords

Plant pathogen repression Biocontrol Ecosystem services Soil health Functional soil biodiversity 

Notes

Acknowledgements

We thank Prof. Dr. Liliane Ruess and Michael Ackermann (HU Berlin) for providing the mass cultures of A. saprophilus and their valuable advice for the breeding procedure. Furthermore, the excellent technical assistance of Sabine El Sayed, Berthold Ortmeier, Evelin Schummer, Anke Führer, Sina Wedekind, Marco Hornbostel, Svenja Wiedenroth, Annika Rickmann and Sarah Havertz is gratefully acknowledged. For providing the climate data of the field site, we thank Jan Bug from the Institute of Physical Geography and Landscape Ecology, University of Hannover. The study was supported by the German Federal Environmental Foundation, Deutsche Bundesstiftung Umwelt (DBU), by providing a personal grant to Friederike Meyer-Wolfarth. Furthermore, the financial support of the Brigitte und Wolfram Gedek-Stiftung is gratefully acknowledged.

Compliance with ethical standards

Conflict of interest

The authors declare that there are no conflicts of interest.

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Copyright information

© Society for Mycotoxin Research and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Institute of BiodiversityJohann Heinrich von Thünen-Institute (TI) - Federal Research Institute for Rural Areas, Forestry and FisheriesBraunschweigGermany
  2. 2.Institute for Plant Protection in Field Crops and GrasslandJulius Kühn-Institute (JKI) - Federal Research Institute for Cultivated PlantsBraunschweigGermany
  3. 3.The Chamber of Agriculture Lower Saxony, Department of Plant ProtectionHannoverGermany
  4. 4.Institute of Agricultural TechnologyJohann Heinrich von Thünen-Institute (TI) - Federal Research Institute for Rural Areas, Forestry and FisheriesBraunschweigGermany

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