Planteværn Online > Skadevoldere - Weed biology<br> <sub>Agro-region: Denmark</sub> - Perennial Rye-grass
Crop Protection Online    
25.4 2024 undefined

Weed biology
Agro-region: Denmark

Perennial Rye-grass Previous page Next page

Go to identification key for weeds

Can be mistaken for

Perennial Rye-grass, ALS-resthat is morphologically identical but resistant to ALS-herbicides
Perennial Rye-grass, fop/dim-resthat is morphologically identical but resistant to fop/dim-herbicides
Perennial Rye-grass, 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
Perennial Rye-grass: Very early stage
Very early stage
Perennial Rye-grass: Early stage
Early stage
Perennial Rye-grass: Ligule
Ligule
Perennial Rye-grass: Shiney leaf underside
Shiney leaf underside
Perennial Rye-grass: Flowering spikelets
Flowering spikelets
Perennial Rye-grass: Mature plant
Mature plant
Perennial Rye-grass: 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