Dallisgrass, field paspalum, and thin paspalum are common perennial weeds in turf, and are some of the more difficult-to-control weeds. All three species resemble each other very closely, and field paspalum and thin paspalum are often mistakenly called dallisgrass. Thin paspalum has a glossier, more shiny leaf when young than dallisgrass. Dallisgrass leaf appearance is very similar to crabgrass, which is a dull green appearance.
Dallisgrass, like other perennial paspalums, is one of the more difficult-to-control weeds in turfgrasses. Perennial grass weeds such as dallisgrass are not desirable as turfgrass species under any conditions. Therefore, every effort should be made to prevent these weedy grasses from becoming established in turf, as selective control measures are usually difficult. Maintaining a dense, healthy turf year round by proper mowing and fertilization helps prevent encroachment and weed establishment.
raceme; hairy spikelets arranged in 4 rows on 3 - 8 alternate branches on tall (up to 5 feet in unmowed situations) terminal stalks
leaves rolled in the bud
membranous; up to 0.2 inches (5 mm) long, sharp pointed to blunt
Growth Season/Life Cycle
Leaf blade tip shape
sharp-pointed; flat, sharply creased, not hairy or with a few hairs at base, hairs behind ligule, edges smooth or rough
Leaf blade width
0.28 - 0.6 inches (7 - 15 mm) wide
present; occasional and very short
continuous; not hairy, often hairy on edges
split with overlapping margins
flattened; sheath is not densely hairy, often has long hairs near base of plant; slightly creased