How to identify Couch Grass
Tuesday, August 19, 2014
HOW TO IDENTIFY COUCH GRASS (Elymus repens) - by Jörg P. Euler
Couch grass (Elymus repens) is the most common perennial grass weed in arable crops in the moderate climate - rhizomes can be detected at any growth stage, so always carry a spade with you when looking for couch fields.
What to look for...
|Position of flowers/seeds||Rhizomes|
Some useful information:
- The plant propagates almost only through rhizomes - which makes it difficult to control. Couch plants in a field show little genetic variability
- With couch, a long term assessment should always be planned - the corner points of the trial should be marked carefully
- Cultivators and harrows will drag the rhizomes into neighbouring plots - therefore, the trial area should only be ploughed
- For long term assessments, make sure the grower does not use a selective herbicide that is active on couch in the trial area
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