North Africa grass (Ventenata dubia). Photo: Matt Lavin (CC BY-SA 2.0)

North Africa Grass

Ventenata dubia

Description

  • Winter annual grass that grows 10-45 cm tall
  • Stems are long, thin, wiry, and branching
  • Leaves are narrow, smooth-edged, and occur mainly on the lower half of stems
  • Young plants (May/June) are green, have reddish-black nodes, long ligules, and shallow roots
  • Mature plants (June/July) are silvery/green, erect, have smooth-like stems, and an open panicle
  • Senesced plants (July/August) have straight lower awns and twisted/bent upper awns
  • Grows in open, disturbed areas typically below 1800 m elevation
    (e.g., grasslands, rangelands, roadsides, rail lines, dry forests, and riparian areas)
Young North Africa grass inflorescence.
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Introduction and spread

  • Native to north Africa, south-central Europe, south Russia, and west Asia
  • Confirmed in BC in the West and Central Kootenays, Boundary, Metro Vancouver, and Nanaimo
  • Spreads by seed with 15-35 seeds/plant
  • Seeds are viable for at least 3 years
  • Seeds disperse by contaminated hay and grass seed mixes, machinery, vehicles, humans, and animals
  • Can re-produce inflorescence in the same year if cut or grazed

Consequences of invasion

  • Displaces native grasses and forbs, altering the plant community and reducing biodiversity
  • Degrades grassland habitats
  • Reduces forage for wildlife and livestock
  • Reduces agricultural yields
  • Increases soil erosion

Status in the CKISS region

Integrated pest management options

Prevention

  • Learn to identify this plant and report any sightings!
  • Immediately revegetate bare, disturbed soils with a non-invasive seed mix to reduce invasion.
  • Maintain a diverse, healthy native plant community to discourage invasion.
  • Do not move contaminated soils to a new area.
  • Clean your clothing, boots, vehicles, gear, and pets before entering/leaving an area.

Mechanical control

  • Hand-pull small infestations before seed set.
  • Mowing can be effective before seed set and before soils dry out.

Chemical control

  • Herbicides labeled for Ventenata management can be effective, but requires proper administration, timing, and possibly follow-up treatments.

Cultural control

  • Prescribed burns do NOT appear to be an effective control measure

Additional resources