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BLUEGRASS, ROUGH
 Bluegrass, Rough
[Poa trivialis L.]
Rough
(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.
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Characteristic
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Description
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Seedhead
/ Flower
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seedhead
is a panicle with flattened spikelets with 2-3 seeds each
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Vernation
Type
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leaves
folded in the bud
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Ligule
Type
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membranous;
sharp pointed, entire, may be hairs along the edge, 0.16 - 0.24 inches (4 - 6
mm) long
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Growth
Season / Life Cycle
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cool
season turf or perennial weed
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Auricle
Type
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absent
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Leaf
Blade Tip Shape
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boat
shaped; flat, sharply creased, glossy, edges rough at least near tip; two
distinct, clear lines, one on each side of the midrib
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Leaf
Blade Width
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0.04 -
0.16 inches (1 - 4 mm) wide
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Stolon
Presence
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present
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Rhizome
Presence
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absent
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Collar
Type
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divided
by midrib, distinct
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Sheath
Margin
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open
part way only
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Sheath
Type
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flattened;
sheath is usually rough; sharply creased
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rough bluegrass
ligule
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rough bluegrass
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Note: Still not
sure this is the right turfgrass? The Turf & Weed Identification
Decision Aid may help. Check the TurfFiles glossary for definitions
of unfamiliar terms.
Diseases Which May Affect This Turfgrass
brown patch
damping off
dollar spot
fairy ring
gray snow
mold
leaf spot /
melting out
Microdochium
patch (pink snow mold)
Pythium
blight
Pythium
root rot
slime mold
yellow tuft
© North Carolina State University. This information sheet was prepared
by Arthur H. Bruneau, Bridget R. Lassiter, Gail G. Wilkerson, Emily J.
Erickson, Casey Reynolds, Jenifer J. Reynolds, and Gregory S. Buol. Department
of Crop Science, College of Agriculture & Life Sciences, North Carolina
State University. Prepared April 29, 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.
KEYWORDS FOUND IN THIS ARTICLE:
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