Broomsedge

Also known as:
Whiskey Grass
Family:
Poaceae
Origin:
Eastern USA

General description

Erect perennial clumping grass <1m high. Stems flattened, sheaths have long hairs. Narrow, green or bluish green leaves, distinct keels & hairs at base. Flowerheads long, thin, hairy stipules. Hairy seeds.

Roadsides, coastal areas, riverbeds, poor pasture. Prefers warm, humid conditions. Tolerate wide range of soil types.

Seeds by wind, contaminant in other seeds, attachment to wool, fur, clothing, machinery.

Forms dense stands in disturbed or open sites, displaces other desirable species. Accelerates erosion & poses a fire risk.

Site management

Major potential pest, eradicate wherever possible. Report new sites. Improved pasture quality deters establishment. Dead plant matter impedes control so avoid temptation to burn (also the plant is fire stimulated). Exclude stock. Follow up control Sep, Nov, Mar, & May until eradicated.

Recommended approaches

1. Report it immediately to the Auckland Council Biosecurity team, who will arrange for its control at their expense.
2. Grub out small clumps.
3. Weed wipe spring-summer (500ml glyphosate/1L).
4. Slash tops of plant, spray regrowth spring-summer (150ml glyphosate + 20ml penetrant/10L).
5. Spray dense stands spring-summer (150ml glyphosate + 20ml penetrant/10L or 60ml haloxyfop (selective) /10L).

Caution: when using any herbicide or pesticide PLEASE READ THE LABEL THOROUGHLY to ensure that all instructions and safety requirements are followed.

RPMS status

Total Control - Whole Region
broomsedge - Main species image