First report on herbicide resistance of Wild Oat (<em>Avena fatua</em> L.) in Germany

Authors

  • Bernd Augustin Dienstleistungszentrum Ländlicher Raum Rheinhessen-Nahe-Hunsrück (DLR RNH), Bad Kreuznach

DOI:

https://doi.org/10.5073/JfK.2013.09.03

Keywords:

Avena fatua, ACCase, ALS, Fenoxaprop, Pinoxaden, Clodinafop Pinoxaden, Cycloxidim, Iodosulfuron

Abstract

Two seed samples of Wild Oat (F1, F2) were collected from sugar beet fields in Rhineland-Palatinate in 2011 showing reduced herbicide performance. A seed treatment with gibberellic acid improved uniform germination of the Wild Oat samples during greenhouse experiments. Herbicide action was tested by means of two successive biotests. ACCase-inhibitors (Fenoxaprop, Pinoxaden, Clodinafop+Pinoxaden, Cycloxidim) and one ALS-inhibitor were treated at 2–3-leafstage of the Wild Oat. The visual rating of herbicide efficiency 3 and 4 weeks after treatment showed a cross resistance among the tested ACCase-inhibitors, except for Cycloxidim for both samples. Seed sample F2 revealed an advanced degree of herbicide resistance, declining from Fenoxaprop to Pinoxaden. Herbicide resistance of sample F1 was restricted to single plants. A subsequent genetic analysis of leaf material revealed a target-site mutation I1781L for both samples of Wild Oat.

Further investigations are necessary in order to access reduced performance of Iodosulfuron.

 

 

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Published

2013-09-01

Issue

Vol. 65 No. 9 (2013)

Section

Original Article

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