[Poa trivialis L.]
(also called roughstalk) bluegrass has a relatively limited adaptation as a
turf species because of intolerance to heat, drought, and traffic. It is also
very patchy in appearance and therefore does not perform well in mixtures.
However, rough bluegrass is sometimes used alone or in combination with
perennial ryegrass for winter overseeding of golf course putting greens. Rough
bluegrass can often be confused with Kentucky bluegrass. One way to distinguish
them is to examine the root structures: rough bluegrass has stolons (above
ground) and Kentucky bluegrass has rhizomes (below ground). Another way to
distinguish between them is that rough bluegrass has a long, pointed membranous
ligule and Kentucky bluegrass has a short, even membranous ligule.
Seedhead / Flower
seedhead is a panicle with flattened spikelets with 2-3 seeds
leaves folded in the bud
membranous; sharp pointed, entire, may be hairs along the edge,
0.16 - 0.24 inches (4 - 6 mm) long
Growth Season / Life Cycle
cool season turf or perennial weed
Leaf Blade Tip Shape
boat shaped; flat, sharply creased, glossy, edges rough at
least near tip; two distinct, clear lines, one on each side of the midrib
Leaf Blade Width
0.04 - 0.16 inches (1 - 4 mm) wide
divided by midrib, distinct
open part way only
flattened; sheath is usually rough; sharply creased
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.
turfgrasses are difficult to control within another turfgrass. Therefore, turf
managers should select clean seed or vegetative sources for establishment, use
an adapted turfgrass species and cultivar for their location, and use proper
mowing and fertilization techniques to maintain a dense, actively growing,
desired turf. Digging or removal with hand or mechanical equipment, for example
a sod cutter, is one way to control undesired perennial turfgrasses. You may
spot treat an infested area with an appropriate non-selective herbicide,
realizing it will also kill the desired turfgrass.
Rough bluegrass can be controlled
postemergence with sulfonylurea herbicides (e.g., TranXit GTA, Certainty) in
tolerant turfgrass species.
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.