[Cyperus retrorsus Chapman]
sedge is an upright perennial weed that can reach heights of 20". It is a
very common weed in sandy and moist habitats. The seedhead is comprised of
several spikelets. Each spikelet consists of a long stalk with an oblong
cluster of seeds perched on the end. Cylindric sedge and globe sedge seedheads
are very similar in appearance. However, globe sedge seedheads are round,
whereas cylindric sedge seedheads are oblong.
Seed Arrangement on Spikes
Seedhead Spikelet Shape
oblong; seedhead branches at the top of the stem, oblong
seedheads are green, and turn dark brown at maturity
Note: Still not
sure this is the right weed? The Turf
& Weed Identification Decision Aid may help. Check the TurfFiles glossary for definitions
of unfamiliar terms.
weeds that resemble grasses but unlike grasses, sedges have three-sided or
triangular stems. It is important to properly distinguish sedges from grasses
because management is totally different. As a general rule, sedges are more of
a problem in warmer climates than cooler climates. Proper identification and an
understanding of the biology of sedges are necessary for effective management.
Sedges are plants that thrive in wet or poorly drained soils but can survive in
areas that are not wet. Because of frequent irrigation in highly maintained
turf, sedges often thrive in the turfgrass environment. Sedges often become
established in wet areas and spread to other areas that are not poorly drained
or wet areas. Therefore, it is important to recognize areas where sedges can
become established and prevent spread of these sedge species to other areas of
the golf course or landscape.
Effective control is achieved
with postemergence applications of sulfonylurea herbicides including Monument
and Certainty, or with imazaquin (Image) plus MSMA. However, MSMA may be phased
out in 2009.
Recommendations of specific chemicals are based upon information on the
manufacturer's label and performance in a limited number of trials. Because
environmental conditions and methods of application may vary widely,
performance of the chemical will not always conform to the safety and pest
control standards indicated by experimental data. The order in which brand
names are given is not an indication of a recommendation or criticism.
Recommendations for the use of
agricultural chemicals are included in this publication as a convenience to the
reader. The use of brand names and any mention or listing of commercial
products or services does not imply endorsement by North Carolina State
University or discrimination against similar products or services not
mentioned. Other brand names may be labeled for use on turfgrasses. Individuals
who use agricultural chemicals are responsible for ensuring that the intended
use complies with current regulations and conforms to the product label. Be
sure to obtain current information about usage regulations and examine a
current product label before applying any chemical. For assistance, contact
your county's Cooperative Extension agent.
© North Carolina State University. This information sheet was prepared
by Fred Yelverton, Bridget R. Lassiter, Gail G. Wilkerson, Leon Warren, Travis Gannon, Jenifer J. Reynolds, and Gregory S. Buol. Department of Crop
Science, College of Agriculture & Life Sciences, North Carolina State
University. Prepared July 15, 2008. Available on-line at
www.turffiles.ncsu.edu. This publication was made possible through a grant
provided by the Center for Turfgrass Environmental Research & Education
(CENTERE) whose purpose is to support worthwhile projects that will benefit
both the private sector and the public, and protect the environment.