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Species
Information
- purple
nutsedge (nutgrass)
- Cyperus
rotundus L.
- USDA
Symbol: CYRO
- Oregon
Noxious Weed Designation: A
- Pictures
ALERT: PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES
Identification: Perennial; grows 1 to 2 feet high. Stems 3 cornered and generally longer than the basal leaves. Leaves grass-like, 1/8 to 1/3 inch wide and 2 to 6 inches in length. Inflorescence consists of numerous purple spikelets. Underground tubers oblong, covered by persistent reddish scales and often formed in chains.
This species is not yet known to occur in Oregon.
Impacts: This plant was introduced to the U.S. from Europe and can be found on virtually every continent. It is considered one of the world's top 10 agriculural weeds. It thrives in moist conditions, most notably in the sandy soils found on river bottoms; areas which are critical for food production in many third world countries. As a nutsedge, it forms nut-like turions which resist herbicide treatments and tillage. In infested countries, it is commonly found in turf, ornamental areas, cultivated fields and ditch banks. In Oregon it is considered a potential threat to containerized horticultural products.
Biological
Controls: Biological control agents are not used on "A" listed weeds in Oregon. If this weed is found in the state it will be managed for eradication or containment.
Oregon
Maps of Purple Nutsedge Distribution
Links:
USDA
Plants Database information on purple nutsedge
GRIN
Database information on purple nutsedge
Oregon Department
of Agriculture information on purple nutsedge
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