European Journal of Plant Pathology (2011) 130, 239-248

Tiphaine Dubos, Matias Pasquali, Friederike Pogoda, Lucien Hoffmann and Marco Beyer (2011)
Evidence for natural resistance towards trifloxystrobin in Fusarium graminearum
European Journal of Plant Pathology 130 (2), 239-248
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.
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Link to article at publishers website
Database assignments for author(s): Marco Beyer, Matias Pasquali

Research topic(s) for pests/diseases/weeds:
pesticide resistance of pest

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Fusarium graminearum		Belgium
	Fusarium graminearum		Germany
	Fusarium graminearum		Italy
	Fusarium graminearum		Luxembourg