180px-Nutgrass_Cyperus_rotundus02.jpg13b[1].jpg
Scientific Nam
e:
cyperus rotundus
Common Name: purple nutsedge
Origin: Sedge (Cyperaceae) native to Africa southern and central Europe north to France and Austria and southern Asia.
Identification: it grows from 0.3 to 0.6 metres tall; triangular 3-sided unbranched flower stems; grass-like leaves; purple to brown flowers; leaf-like bracts under flower clusters are shorter than the flowers; rough, oblong, irregularly shaped tubers are formed in chains; tubers have a bitter flavour
Characteristics: aggressive perennial in the Sedge Family. Cyperus rotundus is one of the most invasive weeds known, having spread out to a world-wide distribution in tropical and temperate regions. It has been called "the world's worst weed" as it is known as a weed in over 90 countries, and infests over 50 crops worldwide.Tubers are produced in chains on rhizomes
Habitat: native to Eurasia but not currently established in British Columbia; tubers are known to have been introduced recently in a shipment of imported roses .
management:Tubers are key to perennial nutsedges’ survival. If you can limit production of the tubers, then the nutsedge will eventually be controlled remove small nutsedge plants before they have five to six leaves; in summer this is about every 2 to 3 weeks. Up to this stage, new tubers have not yet formed. chemicals such as round up have been succesfull when applied to the plant at a young age
References: http://www.ipm.ucdavis.edu/PMG/PESTNOTES/pn7432.html

http://www.agf.gov.bc.ca/cropprot/weedguid/purplent.htm