Crop Protection Online > Pests - Weed biology<br> <sub>Agro-region: Denmark</sub> - Lolium perenne L.

Crop Protection Online

26.4 2024

Weed biology
_{Agro-region: Denmark}

Lolium perenne L.

Can be mistaken for

Lolium perenne L., ALS-resthat is morphologically identical but resistant to ALS-herbicides

Lolium perenne L., fop/dim-resthat is morphologically identical but resistant to fop/dim-herbicides

Lolium perenne L., metabolicthat is morphologically identical but has a metabolic resistance to a range of herbicides

Characteristics

Early stages
Folded vernation. The leaves seem soft and limp. The underside of the leaves are highly shiny. Small-toothed leaves. The ligule is short, approx. 1 mm. The lower leaf sheaths are often reddish purple.

Mature plant
Perennial Rye-grass is a medium-sized grass species with 20-50 cm high, erect, highly shiny stems. The awnless spikelets are joined in an open, oblong spike. The edge of the spikelets faces the straw unlike Couch-grass, where the surface of the spikelet faces the straw. Seed production: Up to approx. 150 seeds per spike.

Seed
Oblong, almost rectangular in outline. Awnless. The bract is 5-veined, slightly domed. The rachilla is short, flat and densely compressed and often sparsely toothed. Thousand grain weight approx. 2.0 g.

Biology

Propagation and dispersal
Mainly through seeds.

Habit
Perennial.

Importance

The species is frequently found at properties where it is part of the crop rotation as either roughage or seed crop. As a weed Rerennial Ryegrass can be found in all types of crops, where it can cause some losses at large densities. Perennial Rye-grass is undesirable in seed fields with Cocksfoot, Meadow Fescue and Red Fescue because it is difficult to separate the seeds.

For treatment options, consult 'Herbicides Across'.
For more options, consult 'Main Menu'.

Taxonomy

Gramineae.

Names in different languages

Danish :	Rajgræs, alm.
German :	Deutsches Weidelgras
English :	Perennial Rye-grass
Latin :	Lolium perenne L.
Norwegian :	Raigras
Swedish :	Engelskt Rajgräs

Very early stage

Early stage

Ligule

Shiney leaf underside

Flowering spikelets

Mature plant

Seeds

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Weed biology Agro-region: Denmark