WSU Whatcom County Extension

Integrated Pest Management for Blueberries

Nut Sedge

Other Weeds

 

Nutsedge

Habitat Characteristics

Found in several different soil types but prefers well-drained, sandy soils or damp to wet sites.

Nutsedge

Identification

Yellow nutsedge resembles a grass, but is a true sedge and has a triangular stem. The leaves are long, yellowish-green and have a waxy appearance. The yellow-brown flowers are in spikelets at the ends of slender branches. Underground structures are rhizomes and tubers (nutlets).

Nutsedge

Life History

Reproduction is primarily by tubers or rhizomes, although viable seeds can also be produced. Tubers are produced at the end of rhizomes in late June and continuing into autumn. One plant can produced thousands of tubers. Tubers sprout and seedlings emerge from May until mid-July. Foliage becomes yellow to reddish brown in late summer and is susceptible to common rust disease. Vegetative growth appears from May to mid-July. Flowers are present from July to September.

Nutsedge

Management

Cultural Techniques

     - Cultivation may deplete the energy reserves of the tubers (nutlets), but must be done frequently to gain control.

     - Competition from other covers, such as small grains or other grasses, can help by forming dense canopies over the nutsedge and outcompeting the offending plant.

Chemical Techniques

     - See Herbicide Efficacy Table (pdf)

 

Web References

USDA – NRCS Plant Profile, Yellow Nutsedge
http://plants.usda.gov/java/profile?symbol=CYES&photoID=cyes_005_ahp.tif

University of California IPM, Weed Gallery, Yellow Nutsedge
http://www.ipm.ucdavis.edu/PMG/WEEDS/yellow_nutsedge.html

Invasive Species, The Source for Information and Images of Invasive & Exotic Species, Yellow Nutsedge
http://www.invasive.org/browse/subject.cfm?sub=3016

B.C. Ministry of Agriculture and Lands, Yellow Nutsedge
http://www.agf.gov.bc.ca/cropprot/weedguid/yellownt.htm

Weeds B.C., Yellow Nutsedge
http://www.weedsbc.ca/weed_desc/yel_nut.html

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WSU Whatcom County Extension • 1000 N. Forest St., Bellingham, WA 98225 • (360) 778-5800 • whatcom@wsu.edu