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European Journal of Plant Pathology

, Volume 130, Issue 2, pp 239–248 | Cite as

Evidence for natural resistance towards trifloxystrobin in Fusarium graminearum

  • Tiphaine Dubos
  • Matias Pasquali
  • Friederike Pogoda
  • Lucien Hoffmann
  • Marco Beyer
Article

Abstract

A collection of 55 Fusarium graminearum (Gibberella zeae) strains isolated between 1969 and 2009 in Belgium, Canada, Germany, Italy, Luxembourg, or the USA belonging to the three known chemotypes (3-acetylated deoxynivalenol, 15-acetylated deoxynivalenol and nivalenol) were screened for their sensitivity towards the fungicide trifloxystrobin using a liquid culture assay. None of the isolates was completely inhibited by trifloxystrobin concentrations up to 3 mM. For comparison, prothioconazole completely inhibited fungal growth of a standard isolate at concentrations as low as 0.007 mM. The maximum level of inhibition, which could be obtained by trifloxystrobin, ranged from 14 to 65% among the strains tested and was not significantly affected by the country of origin or by the chemotype. The absence of significant differences in resistance levels between the countries of origin and chemotypes as well as the fact that strains isolated before the market introduction of strobilurins in 1996 also showed a high level of resistance is evidence that this is largely a case of natural resistance and not primarily related to strobilurin use in agriculture.

Keywords

Chemotype Gibberella zeae Fungicide Respiration inhibition 

Notes

Acknowledgements

We would like to thank Kerry O’Donnell, Virgilio Balmas and Liane Gale for providing fungal strains, Servane Contal for technical assistance, and the ‘Administration des Services Techniques de l’Agriculture de Luxembourg’ for financial support.

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Copyright information

© KNPV 2011

Authors and Affiliations

  • Tiphaine Dubos
    • 1
  • Matias Pasquali
    • 1
  • Friederike Pogoda
    • 1
  • Lucien Hoffmann
    • 1
  • Marco Beyer
    • 1
  1. 1.Centre de Recherche Public – Gabriel LippmannDépartement Environnement et Agro-biotechnologiesBelvauxLuxembourg

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