Facts At-A-Glance – Black-grass


Black-grass Facts At-A-Glance

Herbicide resistance EMR, ACCase TSR and ALS TSR
Leaves Fine and smooth
Auricles None
Ligules Blunt and finely serrated; 2.5mm
Number of seeds produced per plant Up to 1000 per plant consisting of 100 seeds in each of the 10 heads
Seed shed June to August
Germination period September to November (80%), March to May (20%)
Germination depth Up to 5cm
Primary dormancy Varies with summer temperatures, hot = low dormancy, cold = high dormancy
Does it have a secondary dormancy? Yes
Seed longevity 1 – 5 years
Factor promoting germination (light)
Rate of annual seed decline with cultivations 68% per year
Geographical location Located in the main cereal growing area of the UK, the east of England. Now moving to other areas predominantly in straw used for bedding or in machinery such as balers and pea viners.
Soil Type Thrives on a wide range of soil types, predominantly water retentive heavy clays or silts, but very adaptable.
Impact Competitive and has a high seed multiplication rate for following years/crops. 10 plants m²=13% yield loss in cereals

Black-grass is only propagated from seeds and grows in tufts with up to 10 or more tillers per plant. It has a green-purple flower head.


Black-grass News