Crop Protection Online > Pests - Weed biology<br> <sub>Agro-region: Denmark</sub> - Lolium perenne L., ALS-res
Crop Protection Online    
21.7 2024 undefined

Weed biology
Agro-region: Denmark

Lolium perenne L., ALS-res Previous page Next page

Go to identification key for weeds

Can be mistaken for

Lolium perenne L.that is morphologically identical but not resistant to ALS-herbicides

Resistance to herbicides

There have been significant populations of this weed in Denmark, which requires special considerations in the control. Read more here.

Characteristics

Early stagesFolded 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 plantPerennial 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.
SeedOblong, 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 dispersalMainly through seeds.
HabitPerennial.

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

Lolium perenne L., ALS-res: Very early stage
Very early stage
Lolium perenne L., ALS-res: Early stage
Early stage
Lolium perenne L., ALS-res: Ligule
Ligule
Lolium perenne L., ALS-res: Shiney leaf underside
Shiney leaf underside
Lolium perenne L., ALS-res: Flowering spikelets
Flowering spikelets
Lolium perenne L., ALS-res: Mature plant
Mature plant
Lolium perenne L., ALS-res: Seeds
Seeds

 
Crop Protection Online is published by Department of Agroecology, Aarhus University and SEGES Innovation.
Informations for which license is not needed may be used with reference of source.

E-mail to planteit@seges.dk