Facts At-A-Glance – Annual meadow-grass

25.09.2017

Annual meadow-grass Facts At-A-Glance

Resistance risk Resistance to paraquat and simazine was recorded in hops and orchards in the UK in 198 but no known resistance has been found in arable crops.
Leaves Light green with a distinctive boat shaped tip, folded in the shoot.
Auricles None
Ligules Roundly pointed and serrated, 2-5mm.
Number of seeds produced per plant Up to 500
Seed shed April to November
Germination period February to November
Germination depth Up to 5cm
Primary dormancy Some
Does it have a secondary dormancy? Some
Seed longevity >5 years
Factor promoting germination light
Rate of seed decline with cultivations 45%
Geographical location Annual meadow-grass is the most common grass weed throughout most of the UK
Soil type The weed thrives on fertile soils which are disturbed frequently but it will grow in most conditions and withstands waterlogging or drought.
Impact Due to its size the effect of annual meadow-grass on yield is limited, in excess of 50 plants per m² would be needed to reduce yield by 5%, but it does compete for nitrogen. Its presence in the base of the crop at harvest can maintain moisture levels and slow the progress of combining.

Annual meadow grass can complete its lifecycle in 6 weeks and a second flush of seedlings can appear in a crop prior to harvest.

Annual meadow-grass News