Alopecurus myosuroides

Scientific Name Alopecurus myosuroides Hudson
Common Names English: Blackgrass; German: Acker-Fuchsschwanz; French: Vulpin des champs; Spanish: Cola de zorra
Description Annual or perennial tufted grass, up to 60 cm (23.62 inch) tall, occasionally taller.

Descriptions

Characteristic Features

Rough, irregular slits in the ligule.

Young Plant

First leaf delicate and corkscrewed, leaf blade narrow, hairless.

Stems

Erect.

Leaves

Narrow, sharp-edged, bare, ridged.
No auricle.
Ligule long, with rough, irregular slits.

Propagatio Organs

Flowers

Single-flowered spikelets, in a slender inflorescence (spike) up to 8 cm (3.15 inch) in length, often tinged with red.
Glume pointed and edged with short hairs.
Lemma awned.

Flowering Period

Early summer.

Fruit

False fruits, generally enclosed in the two glumes.

Seeds

Seeds with furrow-like depressions where they are attached to the plant; seeds fall early. Germination from autumn-spring.
Seeds can germinate from depths of up to 10 cm (3.93 inch).

Viability Of Seeds

3-6 years.

Propagation

By seeds (50-500 seeds per plant).

Occurrence

Soil

A. myosuroides prefers medium-to-heavy loamy and clay soils with sufficient lime content and occurs on fresh to moist soils.

Additional Crop Information

Also in barley, rye, sugarbeet, oil seed rape and legumes. It predominantly occurrs in Western Europe in winter wheat, where the average population density increases dramatically.

Agricultural Importance

Blackgrass greatly reduces grain yield and quality and interferes with combine harvesting. Herbicide resistant biotypes of Alopecurus myosuroides against different herbicide classes (currently mostly ACCase-inhibitors and Isoproturon) in Western Europe reduce the efficacy of control. A heterogeneous distribution of Alopecurus myosuroides populations is often observed. Patches are stable in location and persistent, therefore site-specific control is beneficial. The economic weed thresholds for Blackgrass is 20-30 plants per m² (1.9 - 2.8/sq. ft.). Reduced tillage practices results in a strong increase of Blackgrass populations. 95 % efficacy of control is needed to prevent population increase.

Control

Integrated Crop Management

Careful seed cleaning and selection of weed free fields for crop-seed propagation, preventing seed rain from field borders by grazing, mowing or ploughing field edges and borders, late seeding of winter wheat reduces germination rate of Alopecurus myosuroides. Rotating winter and summer annual crops also reduces the infestation level of Alopecurus myosuroides. Deep ploughing of non dormant weed seeds results in fatal germination and great reduction of weed seed content in the soil.
Mechanical weed control practices using tiny harrows often have poor effect since seedlings emerge from soil depths up to 10 cm (3.93 inch).

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