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Dallisgrass

Description

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.

Cultural Control

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.

Chemical Control

Herbicide and Formulation
Amount of Formulation per 1,000 sq ft
Amount of Formulation per Acre
Pounds Active Ingredient per Acre

Postemergence Control or Suppression of Summer Weeds Such as Crabgrass Species

Herbicide and Formulation

thiencarbazone + foramsulfuron + halosulfuron, MOA 14 + 2 + 2 (Tribute Total) 60.5 WG

Amount of Formulation per 1,000 sq ft

0.0735 oz

Amount of Formulation per Acre

3.2 oz

Pounds Active Ingredient per Acre

0.121

Precaution and Remarks

Apply to well-established residential and commercial bermudagrass and zoysiagrass (Emerald, Meyer, Zeon) lawns, golf courses (excluding greens), athletic fields, sod farms, roadsides, parks, cemeteries and recreational areas. Do not exceed 3.2 ounces per acre per application or 6.4 ounces per acre yearly. Use 0.25 to 0.5% by volume nonionic surfactant or 0.5 to 1% by volume methylated seed oil. After application, wait 12 weeks to overseed ryegrass or bermudagrass. Wait 1 month after bermudagrass seedling emergence and 2 weeks after sprigging or sodding bermudagrass before treating. Temporary stunting and yellowing may last up to 2 weeks but turf will recover. Crabgrass and goosegrass are controlled up to 2 tiller stage.

Postemergence Control

Herbicide and Formulation

MSMA, MOA 17 (various brands)

Amount of Formulation per 1,000 sq ft

Amount of Formulation per Acre

several concentrations

Pounds Active Ingredient per Acre

1.82 to 4.5

Precaution and Remarks

Bermudagrass, bluegrass and zoysiagrass are tolerant. Injury may result on bentgrass, fescue and St. Augustinegrass (commercial sod production only). Do not use on carpetgrass or centipedegrass. MSMA restrictions: For existing golf courses, spot treat (100 square feet per spot) not to exceed 25% of total acreage. For new courses, make 1 broadcast application per year. For sod farms, make 1 to 2 broadcast applications per year and maintain 25 feet buffer around permanent water bodies. For highway rights of way, make 2 broadcast applications and maintain 100 feet buffer around permanent water bodies.

Postemergence Control

Herbicide and Formulation

MSMA, MOA 17 (various brands) + metribuzin, MOA 5 (Sencor 75 Turf) 75 WDF

Amount of Formulation per 1,000 sq ft

Amount of Formulation per Acre

several concentrations + 0.17 to 0.33 lb

Pounds Active Ingredient per Acre

1.5 to 2 + 0.125 to 0.25

Precaution and Remarks

See remarks for MSMA and metribuzin. The combination improves goosegrass control. Should be applied to bermudagrass only.

Postemergence Control

Herbicide and Formulation

MSMA + 2,4-D + MCPP + dicamba, MOA 17 + 4 + 4 + 4 (Trimec Plus) 2.88 F

Amount of Formulation per 1,000 sq ft

3 to 5 fl oz

Amount of Formulation per Acre

1 to 1.67 gal

Pounds Active Ingredient per Acre

1.8 + 0.48 + 0.48 + 0.12

Precaution and Remarks

Use on bermudagrass, perennial bluegrass, fescues, perennial ryegrass, and zoysiagrass. A second application will enhance control of dallisgrass or goosegrass.

Postemergence Control

Herbicide and Formulation

MSMA + 2,4-D + clopyralid + dicamba, MOA 17 + 4 + 4 + 4 (Millennium Ultra Plus) 2.42 L

Amount of Formulation per 1,000 sq ft

3 to 5 fl oz

Amount of Formulation per Acre

1 to 1.67 gal

Pounds Active Ingredient per Acre

2.42 to 4.04

Precaution and Remarks

Do not use on residential turf. Apply to bermudagrass, zoysiagrass, tall fescue, perennial bluegrass, and perennial ryegrass. Apply to seeded grasses after third mowing. Wait 3 to 4 weeks after application to seed. Do not exceed 1 gallon per acre on cool-season grasses and 1.67 gallons per acre on warm-season grasses.

Postemergence Control

Herbicide and Formulation

topramezone, MOA 27 (Pylex) 2.8 L

Amount of Formulation per 1,000 sq ft

0.023 to 0.034 fl oz

Amount of Formulation per Acre

1 to 1.5 fl oz

Pounds Active Ingredient per Acre

0.021875 to 0.0328125

Precaution and Remarks

Labeled for spot treatment use in residential and athletic field turf. Can be broadcast in nonresidential turf sites including sod farms, golf courses (excluding greens and collars), parks, roadsides, cemeteries, and commercial properties. Tolerant turf species include Kentucky bluegrass, tall and fine fescue, perennial ryegrass, and centipedegrass at seeding and then anytime beyond 28 days after seeding. Add crop oil concentrate or methylated seed oil for enhanced control at 0.5 to 1% by volume. Don’t apply greater than 2 fl ounces per acre per application or 4 fluid ounces per acre per year. Bleaching intensity of susceptible weeds reduced and broadleaf weed spectrum increased if tankmixed with Drive XLR8, Onetime or Turflon Ester Ultra. For suppression of above-listed weeds, add Turflon Ester Ultra at 1 pound ae per acre and make either 2 or 3 applications at 3 to 4 week intervals depending on Pylex rate. Creeping bentgrass is marginally tolerant to Pylex at 0.25 fluid ounces per acre. Test on a small area before large-scale use. Sequential applications may be required to achieve desired level of weed control.

Presentations

Publications

Species Data

Seedhead/Flower

raceme; hairy spikelets arranged in 4 rows on 3 - 8 alternate branches on tall (up to 5 feet in unmowed situations) terminal stalks

dallisgrass dsc 7628
dallisgrass dsc 7628
dallisgrass dsc 7628
flowerstemhairs2
flowerstemhairs2
flowerstemhairs2
seedhead6
seedhead6
seedhead6
weed6
weed6
weed6
Vernation type

leaves rolled in the bud

hairyligule2
hairyligule2
hairyligule2
Ligule Type

membranous; up to 0.2 inches (5 mm) long, sharp pointed to blunt

dscn0562
dscn0562
dscn0562
ligule2
ligule2
ligule2
Growth Season/Life Cycle

perennial weed

Auricle type

absent

ligule2
ligule2
ligule2
p1130809 dallisgrass
p1130809 dallisgrass
p1130809 dallisgrass
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

leaftip
leaftip
leaftip
Leaf blade width

0.28 - 0.6 inches (7 - 15 mm) wide

leaftip
leaftip
leaftip
Stolon Presence

absent

Rhizome Presence

present; occasional and very short

Collar Type

continuous; not hairy, often hairy on edges

collar
collar
collar
collar2
collar2
collar2
dallisgrass collar
dallisgrass collar
dallisgrass collar
dscn1206 dallisgrass
dscn1206 dallisgrass
dscn1206 dallisgrass
Sheath Margin

split with overlapping margins

collar2
collar2
collar2
hairyligule2
hairyligule2
hairyligule2
sheathmargin
sheathmargin
sheathmargin
Sheath Type

flattened; sheath is not densely hairy, often has long hairs near base of plant; slightly creased