Setaria faberi

Scientific Name Setaria faberi
Common Names English: Giant foxtail; German: Große Borstenhirse; French: Sétaire géante
Description Annual, warm season grass with heavy seed-propagation, originates from Asia.

Descriptions

Characteristic Features

Foxtail-like seedhead that droops when mature.
Leaves with many hairs on the upper leaf surface.

Young Plant

First leaves are typically parallel to the ground.

Stems

Bent at nodes, rarely branching, glabrous to 1.2 m (3.93 ft) tall.

Leaves

Hairy leaf sheath margins, upper side of leaves hairy.
Fringed membranous ligule
Blades 15-30 cm (5.9 - 11.8 inch) long, 1-2 cm (0.39 - 0.78 inch) wide.
No auricles.

Propagatio Organs

Flowers

Dense panicle, cylindrical, bristly, spike 2.5 to 12.5 cm (0.98 - 4.92 inch) long.
Spikelets 2.5 - 3 mm (0.098 - 0.118 inch) long, 1.2 -1.5 mm (0.047 - 0.059 inch) wide, sessile.
3 - 6 bristles below each spikelet, bristles up to 1 cm (0.39 inch) long.
Lack awns.

Flowering Period

Midsummer - early autumn.

Fruit

Achene-like.

Seeds

Germination from late spring - early summer.
Hard-coated seeds.

Viability Of Seeds

Few years.

Propagation

By seed.
Ca. 400-800 seeds/plant.
Optimal emergence from 1-2 cm (0.39 - 0.78 inch) depth.

Occurrence

Habitat

Riverbanks, cultivated fields, gravel bars, old fields, roadsides, railroads.

Soil

S. faberi prefers low, bottomland cultivated fields and grows best on fertile sandy soils.

Agricultural Importance

S. faberi is a competitive summer annual grass that reduces yields in many crops. Biotypes that have developed resistance against ALS, ACCase and PS II inhibiting herbicides have been identified.

Control

Integrated Crop Management

Tillage and mechanical control methods are effective in controlling seedlings and young plants.

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