[Cyperus globulosus Aublet]
Globe sedge is a perennial weed of turf found in
moist and sandy habitats. The seedhead is comprised of several spikelets. Each
spikelet consists of a long stalk with a round 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
Seed Arrangement on Spikes
Seedhead Spikelet Shape
round; seedhead branches at the
top of the stem, and the seeds are arranged in globe-shaped clusters
globe sedge stem cross
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.
are 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. As with other perennial sedges, multiple
herbicide applications are usually necessary for effective control. Care should
be taken to prevent this sedge from producing seedheads because spread of this
weed is primarily due to seed dispersal.
options include trifloxysulfuron (Monument), sulfosulfuron (Certainty), and
Tolerant Turfs (1)
Average Efficacy Rating(2)
Range of Trial Efficacy Values, %
Number of Trials
ba, be, c, sa, z
turfgrass in the database is completely tolerant. Check label to see if
chemical can be used at a reduced rate or during the dormant season on your
control (90 to 100%)
control (80 to 90%)
control (70 to 80%)
ratings are based on herbicide trials performed by weed scientists at North
Carolina State University between 1997 and 2007. The number of trials
included in the efficacy ratings is displayed in the next-to-last column. The
higher this number, the more confidence can be placed in the efficacy values.
Trials may have involved sequential applications of one or more chemical.
Details of individual trials (herbicide rates, dates of application,
environmental conditions at time of application, etc) can be viewed on the
TurfFiles web site, through the Turf Weed Management
ratings for chemicals lacking trial data are from “Pest
Management Strategic Plan for Turfgrass in the Southern United States,”
summary of a workshop for turf experts from multiple universities held in
Griffin, GA in October, 2004 and sponsored by the Southern Region Integrated
Pest Management Center.
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.
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 June 12, 2009.
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