Planteværn Online > Skadevoldere - Weed biology<br> <sub>Agro-region: Denmark</sub> - Green Bristle-grass
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27.4 2024 undefined

Weed biology
Agro-region: Denmark

Green Bristle-grass Previous page Next page

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Can be mistaken for

Cockspur, which does not have a ligule.

Characteristics

Early stages
Rolled vernation. The leaves are broad and flat. No dentation. The ligule is diffused into a fringe of ciliate hairs.

Mature plant
Green Bristle-grass is 15-40 cm high and often has numerous short, tufty shoots at the base. The plant only attains maximum development in very hot summers. The spikelets are arranged in dense cylindrical tufts with protruding Bristles between the spikelets. Seed production: Up to approx. 5,000 seeds per plant.

Seed
Egg-shaped outline. Domed dorsal side and flat to slightly domed ventral side with no rachilla or ventral furrow. The bract and bracteole are gristly, stiff and inflexible. The surface is finely granular with a regular weaving pattern, except on the two slim and bright side edges of the bracteole. The colour varies, usually dark-spotted. Thousand grain weight approx. 0.9 g.

Biology

Propagation and dispersal
Only through seeds.

Habit
Summer annual.

Importance

Green Bristle-grass is a relatively new weed, which so far is only found locally in Beet and fields where only Maize is grown. As the species is sensitive to shade and needs heat to germinate (late germinating) as well as for further growth and development, it is expected to become a problem in open row crops.

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

Taxonomy

Gramineae.

Names in different languages

Danish : Skærmaks, grøn
German : Grüne Borstenhirse
English : Green Bristle-grass
Latin : Setaria viridis L.
Norwegian : Grøn busthirse
Swedish : Grön kolvhirs
Green Bristle-grass: Very early stage
Very early stage
Green Bristle-grass: Early stage
Early stage
Green Bristle-grass: Leaf sheath
Leaf sheath
Green Bristle-grass: Spikelets
Spikelets
Green Bristle-grass: Mature plant
Mature plant
Green Bristle-grass: Seeds
Seeds
 
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