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Large Crabgrass

Description

Large crabgrass (also called hairy crabgrass) is a common weed in turfgrass situations, and can germinate from March through early May in North Carolina when soil temperatures reach 53 to 58°F at a 4-inch depth. This weed is found in a variety of habitats. Germination of this weed is encouraged by the alternating dry and wet conditions at the soil surface in the spring. Stems have a prostrate growth habit and may root at the lower nodes. Large crabgrass is similar to smooth crabgrass. However, the leaf blade of smooth crabgrass is not as hairy, with a few hairs near the base of the blade. Leaf blade edges of smooth crabgrass are either not hairy or have sparse hairs.

Cultural Control

Crabgrass will grow under close mowing conditions. Competition is enhanced by thin open turfgrass stands, improper mowing heights for the desired turf, summer fertilization, and light, frequent irrigation. For crabgrass control, practice procedures outlined to maintain a dense, actively growing turf.

Chemical Control

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

Preemergence Control

Herbicide and Formulation

benefin, MOA 3 (Balan 2.5 G) 2.5 G

Amount of Formulation per 1,000 sq ft

2.75 lb

Amount of Formulation per Acre

120 lb

Pounds Active Ingredient per Acre

3

Precaution and Remarks

Safe to apply to all established turfgrass except bentgrass. Do not apply in the spring to lawns seeded the previous fall or to golf course greens. Do not use on newly sprigged turfgrasses.

Preemergence Control

Herbicide and Formulation

benefin + trifluralin, MOA 3 + 3 (Team 2 G) 2 G (Team Pro 0.86%) 0.86 G

Amount of Formulation per 1,000 sq ft

3.5 lb 8 lb

Amount of Formulation per Acre

150 lb 349 lb

Pounds Active Ingredient per Acre

3

Precaution and Remarks

Use on lawns and golf course fairways of bahiagrass, bentgrass, bermudagrass, centipedegrass, fescue, perennial ryegrass, St. Augustinegrass, and zoysiagrass.

Preemergence Control

Herbicide and Formulation

bensulide, MOA 8 (Bensumec 4 LF or Betasan 4.8-E) 4 EC (Pre-San) 12.5 G (Pre-San) 7 G

Amount of Formulation per 1,000 sq ft

Amount of Formulation per Acre

varies because several concentrations available

Pounds Active Ingredient per Acre

10

Precaution and Remarks

May be applied to all established turfgrass and dichondra, residential lawns, and also golf course greens and tees. Limit 2 applications per year to greens and tees. Do not use on newly sprigged turfgrasses. Not effective for goosegrass control.

Preemergence Control

Herbicide and Formulation

bensulide + oxadiazon, MOA 8 + 14 (Goosegrass/Crabgrass Control) 6.56 G

Amount of Formulation per 1,000 sq ft

2.6 lb

Amount of Formulation per Acre

116 lb

Pounds Active Ingredient per Acre

6 + 1.5

Precaution and Remarks

Controls crabgrass and goosegrass. Use on established bermudagrass, zoysiagrass, tall fescue, bentgrass, perennial bluegrass, or perennial ryegrass fairways and tees. Use also on bermudagrass and bentgrass greens.

Preemergence Control

Herbicide and Formulation

dithiopyr, MOA 4 (Dimension 2 EW) 2 EW (Dithiopyr 2 L) 2 L (Dimension Ultra WSP, Dynamo 40 WSP or Dithiopyr 40 WSP) 40 WP

Amount of Formulation per 1,000 sq ft

0.75 fl oz 0.46 oz

Amount of Formulation per Acre

1 qt 20 oz

Pounds Active Ingredient per Acre

0.5

Precaution and Remarks

May be applied to most all cool-season and warm-season turfgrasses except colonial bentgrass. See label for injury precautions regarding certain varieties. Also controls pre-tillered crabgrass. Split applications recommended in southern and coastal regions of the state (0.25 pound a.i. at 8 week intervals). Timely irrigation or rainfall is critical for activation.

Preemergence Control

Herbicide and Formulation

indaziflam, MOA 21 (Specticle 20 WSP) 20 WSP

Amount of Formulation per 1,000 sq ft

0.057 to 0.115 oz

Amount of Formulation per Acre

2.5 to 5 oz

Pounds Active Ingredient per Acre

0.03125 to 0.0625

Precaution and Remarks

Use only on established turf (1 year after seeding) such as bermudagrass, zoysiagrass, centipedegrass, St. Augustinegrass, seashore paspalum, and bahiagrass. Labeled for commercial and residential lawns, golf courses (roughs, tees, fairways), sod farms, athletic fields, parks and cemeteries. Use a minimum of 2.5 ounces per acre for crabgrass, annual bluegrass and broadleaf weed control and a minimum of 3.75 ounces per acre for goosegrass, annual sedge and kyllinga species control. Apply up to 2.5 ounces per acre on centipedegrass and St. Augustinegrass due to tolerance concerns. For all other tolerant turfgrasses, do not exceed 5 ounces per acre in a single application or 7.1 ounces per acre within a calendar year. There is an 8 month overseeding restriction following a 2.5 ounces per acre application. Can sprig 2 months following application, or if sprigged first, wait 4 months before spraying. Can sod 4 months following application, or if sodded first wait 2 months after rooting before spraying.

Preemergence Control

Herbicide and Formulation

(Specticle Flo) 0.622 F

Amount of Formulation per 1,000 sq ft

0.69 to 0.23 fl oz

Amount of Formulation per Acre

3 to 10 fl oz

Pounds Active Ingredient per Acre

0.01458 to 0.0486

Precaution and Remarks

Use up to 6 fluid ounces per acre on common bermudagrass, centipedegrass and St. Augustinegrass and 10 fluid ounces per acre on hybrid bermudagrass, zoysiagrass and bahiagrass established 16 months in areas such as golf course roughs and fairways, residential and commercial turf, sod farms, athletic fields, parks and cemeteries. 10 fluid ounces per acre needed for annual sedge and kyllinga species control. Don’t exceed 18.5 fluid ounces per acre per year. Do not vertical mow 1 month before or after application. Irrigate within 2 days of treatment for maximum benefit. Check label for split or multiple application rates and timings. Delay overseeding 10 months if 4.5 to 6 fluid ounces used and 12 months if 6 to 9 fluid ounces used. For sod production, only apply to bermudagrass, zoysiagrass or bahiagrass. Apply if 80% ribbon coverage and before 4 months prior to harvest. Wait 6 month after treatment if sodding bare ground. Apply to actively growing sod established for 3 months.

Preemergence Control

Herbicide and Formulation

metolachlor, MOA 15 (Pennant Magnum ) 7.62 EC

Amount of Formulation per 1,000 sq ft

0.96 fl oz

Amount of Formulation per Acre

2.6 pt

Pounds Active Ingredient per Acre

2.48

Precaution and Remarks

Apply to established bermudagrass, centipedegrass, St. Augustinegrass, bahiagrass, and zoysiagrass. Can apply up to 4.2 pint per acre per year to same area used for commercial sod production.

Preemergence Control

Herbicide and Formulation

napropamide, MOA 15 (Devrinol) 50 DF (Devrinol) 2 G

Amount of Formulation per 1,000 sq ft

1.5 to 2.2 oz 2.3 to 3.4 lb

Amount of Formulation per Acre

4 to 6 lb 100 to 150 lb

Pounds Active Ingredient per Acre

2 to 3

Precaution and Remarks

Use in established bahiagrass, bermudagrass, centipedegrass, St. Augustinegrass, and tall fescue.

Preemergence Control

Herbicide and Formulation

oryzalin, MOA 3 (Oryzalin 4 Pro or Surflan A.S.) 4 AS

Amount of Formulation per 1,000 sq ft

1.5 fl oz

Amount of Formulation per Acre

2 qt

Pounds Active Ingredient per Acre

2

Precaution and Remarks

Use on established bahiagrass, centipedegrass, tall fescue, St. Augustinegrass, zoysiagrass, and bermudagrass except greens and tees. A total of 3 quart per acre may be used if application is split by applying 1.5 quart per acre followed by 1.5 quart per acre 8 to 10 weeks later. Follow label directions. Do not apply in the spring or summer to tall fescue reseeded the previous fall.

Preemergence Control

Herbicide and Formulation

(Harrier WDG) 85 WDG

Amount of Formulation per 1,000 sq ft

0.64 to 0.88 oz

Amount of Formulation per Acre

1.75 to 2.4 lb

Pounds Active Ingredient per Acre

1.4875 to 2.04

Precaution and Remarks

Observe same turf tolerances and tall fescue precautions as above. Successful preemergence activity should occur if activated by 0.5 inch of water within 21 days of application. Apply 2.4 pounds per acre as a single application or 1.75 pounds per acre in sequential applications spaced 12 weeks apart.

Preemergence Control

Herbicide and Formulation

oxadiazon, MOA 14 (Oxadiazon 2 G) 2 G (Ronstar G or Regal Ronstar A.C.) 2 G

Amount of Formulation per 1,000 sq ft

2.3 to 4.6 lb 2.3 to 3.4 lb

Amount of Formulation per Acre

100 to 200 lb 100 to 150 lb

Pounds Active Ingredient per Acre

2 to 4 2 to 3

Precaution and Remarks

Use in established perennial bluegrass, perennial ryegrass, bentgrass, bermudagrass, tall fescue, zoysiagrass, and St. Augustinegrass. Red fescue is not tolerant. Do not apply to dichondra, centipedegrass, putting greens or tees, or to newly seeded areas. Do not apply to bentgrass mowed at less than 3/8 in. Do not apply to wet turf. Rainfall or irrigation after application will improve weed control activity. May be applied when sprigging bermudagrass and zoysiagrass. Do not apply to home lawns.

Preemergence Control

Herbicide and Formulation

(Oxadiazon 50 WSB or Ronstar 50 WSB) 50 WP

Amount of Formulation per 1,000 sq ft

1.5 to 2.2 oz

Amount of Formulation per Acre

4 to 6 lb

Pounds Active Ingredient per Acre

2 to 3

Precaution and Remarks

Use in dormant, established bermudagrass, St. Augustinegrass, and zoysiagrass in fairways and parks. Should be applied at least 2 to 3 weeks before greenup of turf. May be applied when sprigging bermudagrass and zoysiagrass. Do not use on home lawns.

Preemergence Control

Herbicide and Formulation

(Ronstar Flo, Oxadiazon SC or Starfighter L) 3.17 SC

Amount of Formulation per 1,000 sq ft

1.85 to 2.8 fl oz

Amount of Formulation per Acre

2.52 to 3.81 qt

Pounds Active Ingredient per Acre

2 to 3

Precaution and Remarks

Use in dormant, established bermudagrass, St. Augustinegrass, and zoysiagrass in fairways and parks. May apply 2 lb a.i. per acre when sprigging bermudagrass. Make application at least 2 to 3 weeks before greenup of turf. Do not use on home lawns.

Preemergence Control

Herbicide and Formulation

oxadiazon + benefin, MOA 14 + 3 (Regalstar) 1.5 G

Amount of Formulation per 1,000 sq ft

4.5 lb

Amount of Formulation per Acre

200 lb

Pounds Active Ingredient per Acre

2 + 1

Precaution and Remarks

Use on turf and golf courses of bermudagrass, centipedegrass, St. Augustinegrass, zoysiagrass, bentgrass (fairways only), bluegrass, ryegrass, and tall fescue. Do not use on home lawns. Product contains 38% N. Apply to dry foliage.

Preemergence Control

Herbicide and Formulation

oxadiazon + prodiamine, MOA 14 + 3 (Regalstar II) 1.2 G

Amount of Formulation per 1,000 sq ft

4.5 lb

Amount of Formulation per Acre

200 lb

Pounds Active Ingredient per Acre

2 + 0.4

Precaution and Remarks

Use on turf, golf courses (excluding putting greens) of established bermudagrass, zoysiagrass, St. Augustinegrass, ryegrass, centipedegrass, bentgrass, bluegrass, and tall fescue. Product contains 38% N. Apply to dry foliage.

Preemergence Control

Herbicide and Formulation

pendimethalin, MOA 3 (Pendulum 2 G) (Signature 0.86 G) (Signature 0.75 G)

Amount of Formulation per 1,000 sq ft

1.72 to 3.44 lb 2.67 to 5.34 lb 3.1 to 6.15 lb

Amount of Formulation per Acre

75 to 150 lb 116 to 232 lb 135 to 268 lb

Pounds Active Ingredient per Acre

1,5 to 3 1 to 2 1 to 2

Precaution and Remarks

Use on established bahiagrass, bermudagrass, centipedegrass, fine fescue, Kentucky bluegrass, perennial ryegrass, St. Augustinegrass, tall fescue, and zoysiagrass. Do not use on winter-overseeded grasses.

Preemergence Control

Herbicide and Formulation

pendimethalin, MOA 3 (Pendulum AquaCap) 3.8 CS

Amount of Formulation per 1,000 sq ft

1.15 to 2.3 fl oz

Amount of Formulation per Acre

3.1 to 6.3 pt

Pounds Active Ingredient per Acre

1.5 to 3

Precaution and Remarks

Use on noncropland as well as established nonresidential and residential turf areas mowed at least 4 times consisting of bahiagrass, bermudagrass, buffalograss, centipedegrass, St. Augustinegrass, zoysiagrass, Kentucky bluegrass, perennial ryegrass, bentgrass, established Poa annua (0.5 inch height or taller), fine fescue, and tall fescue. Do not use on bentgrass or Poa annua greens and tees. If lower rate is applied initially, repeat in 6-8 weeks for extended control. Do not reseed or overseed into treated turfgrass for 3 months, or sprig turfgrass for 5 months following application. Do not exceed 4.2 pint per acre on residential and sod farm turfgrass.

Preemergence Control

Herbicide and Formulation

pendimethalin + dimethemamid, MOA 3 + 15 (Freehand) 1.75 G

Amount of Formulation per 1,000 sq ft

2.3 to 4.6 lb

Amount of Formulation per Acre

100 to 200

Pounds Active Ingredient per Acre

1.75 to 3.5

Precaution and Remarks

Use on residential, commercial, recreational, sod farm and golf course turf, excluding greens. Tolerant turf species include bermudagrass, centipedegrass, St. Augustinegrass, seashore paspalum and zoysiagrass. For extended control, make sequential applications within 5 to 8 weeks not to exceed 400 lb per acre. Irrigate within 24 hr of application for optimum control. Following application, wait 3 months to overseed, reseed or sprig. If sprigged first, wait 2 months for root establishment to treat. On new sod, mow at least twice before application. On new seedlings, mow at least 4 times before application. Wait 2 weeks after aerification or verticutting before applying.

Preemergence Control

Herbicide and Formulation

prodiamine, MOA 3 (Barricade 65 WG) 65 WG (Barricade 4 FL) 4 FL (Prodiamine 65 WDG, ProClipse 65 WDG or RegalKade 65 WDG) 65 WG

Amount of Formulation per 1,000 sq ft

0.28 to 0.4 oz 0.23 to 1.1 fl oz 0.185 to 0.83 oz

Amount of Formulation per Acre

0.75 to 1.5 lb 0.625 to 3 pt 0.5 to 2.3 lb

Pounds Active Ingredient per Acre

0.5 to 1 0.3125 to 1.5 0.325 to 1.5

Precaution and Remarks

May be used on established bahiagrass, bermudagrass, centipedegrass, St. Augustinegrass, zoysia, tall fescue, creeping red fescue, perennial bluegrass and ryegrass, and creeping bentgrass. Do not apply to greens. May apply when sprigging or plugging bermudagrass, up to 0.8 pound product per acre.

Preemergence Control

Herbicide and Formulation

(RegalKade) 0.5 G

Amount of Formulation per 1,000 sq ft

1.5 to 6.9 lb

Amount of Formulation per Acre

64 to 300 lb

Pounds Active Ingredient per Acre

0.32 to 1.5

Precaution and Remarks

See precautions for Barricade except may be used on established turf only. Do not apply more than 150 pounds per acre per application. Do not make more than two applications per calendar year. Wait at least 60 days after initial application before making a second application. Prodiamine is coated on a 32-3-12 dry fertilizer carrier.

Preemergence Control

Herbicide and Formulation

siduron, MOA 7 (Tupersan) 50 WP

Amount of Formulation per 1,000 sq ft

7.3 oz

Amount of Formulation per Acre

20 lb

Pounds Active Ingredient per Acre

10

Precaution and Remarks

Use only on bluegrass, fescue, perennial ryegrass, and certain bentgrasses (check label). Can be used at the rate of 8 lb of formulation when seeding bentgrass, bluegrass, fescue, and ryegrass. Can also be used in newly sprigged or established zoysia. Do not use on bermudagrass, carpetgrass, or centipedegrass.

Postemergence Control

Herbicide and Formulation

fenoxaprop, MOA 1 (Acclaim Extra) 0.57 EC

Amount of Formulation per 1,000 sq ft

0.3 to 0.9 fl oz

Amount of Formulation per Acre

0.8 to 2.4 pt

Pounds Active Ingredient per Acre

0.057 to 0.174

Precaution and Remarks

Use only on perennial ryegrass, fine fescue, tall fescue, Kentucky bluegrass, and zoysiagrass. Reduced vigor or discoloration can occur. Rate depends upon leaf number or tillers of grass weeds and turf tolerance. Check label. A second application may be applied after 14 days.

Postemergence Control

Herbicide and Formulation

metribuzin, MOA 5 (Sencor 75 Turf) 75 WDF

Amount of Formulation per 1,000 sq ft

0.12 to 0.24 oz

Amount of Formulation per Acre

0.33 to 0.67 lb

Pounds Active Ingredient per Acre

0.25 to 0.5

Precaution and Remarks

Recommended for application by commercial applicators only on established bermudagrass turf (such as parks, athletic fields, golf course fairways, cemeteries, and sod farms) that has a mowing height of 0.5 inch or greater. Apply when turf is vigorously growing and not under stress. Repeat if necessary in 7 to 10 days. Do not make more than two applications per season. Do not apply to greens, tees, or aprons.

Postemergence Control

Herbicide and Formulation

sethoxydim, MOA 1 (Segment, Sethoxydim SPC) 1 EC

Amount of Formulation per 1,000 sq ft

0.8 to 1.38 fl oz

Amount of Formulation per Acre

2.25 to 3.75 pt

Pounds Active Ingredient per Acre

0.28 to 0.47

Precaution and Remarks

Use in seedling and established centipedegrass and fine fescues. Apply 2.25 pint to grasses up to 6 inches and 3.75 pt to grasses up to 12 inches if turf is tolerant. Does not control yellow and purple nutsedge, annual bluegrass or broadleaf weeds. Apply no sooner than 3 weeks after spring greenup of centipedegrass. Apply before crabgrass becomes extensively tillered. Delay all treatments until newly planted centipedegrass has 3 inches of new stolon growth. Do not mow within 7 days before or after application. Two applications 3 weeks apart will suppress bahiagrass. Additives or adjuvants not required.

Postemergence Control

Herbicide and Formulation

quinclorac, MOA (27 + 4) (Drive 75 DF, Quinclorac 75 DF or Quinclorac SPC 75 DF) 75 DF (Drive XLR8) 1.5 SL

Amount of Formulation per 1,000 sq ft

0.367 oz 1.45 fl oz

Amount of Formulation per Acre

1 lb 2 qt

Pounds Active Ingredient per Acre

0.75 0.75

Precaution and Remarks

For use in residential and nonresidential turf that is established or newly seeded, overseeded, or sprigged. Refer to label for specific varieties. Apply to common and hybrid bermudagrass, Kentucky bluegrass, annual bluegrass, buffalograss, tall fescue, annual and perennial ryegrass, creeping bentgrass, and zoysiagrass. Can also be applied to fine fescue but must be in a blend. Some discoloration of hybrid bermudagrass, creeping bentgrass or fine fescue may occur. Do not apply to bahiagrass, centipedegrass, St. Augustinegrass, or dichondra. Do not use on golf course greens or collars. The addition of methylated seed oil (1.5 pint per acre or 0.55 ounces per 1,000 sq ft) or a crop oil concentrate (2 pint per acre or 0.73 ounces per 1,000 square feet) is required for control. Application to weeds under stress will result in poor control. Irrigation 24 hours prior to application is recommended if drought conditions exist. Some ornamental plants are sensitive to Drive. See label for further precautions.

Postemergence Control

Herbicide and Formulation

quinclorac + sulfentrazone + 2,4-D amine + dicamba, MOA (27 + 4) + 14 + 4 + 4 (Q4) 1.54 L

Amount of Formulation per 1,000 sq ft

2.57 to 2.94 fl oz

Amount of Formulation per Acre

7 to 8 pt

Pounds Active Ingredient per Acre

1.35 to 1.54

Precaution and Remarks

For use in fully dormant bermudagrass and zoysiagrass as well as cool-season turf including annual bluegrass and ryegrass, perennial bluegrass and ryegrass, and fescue species. Do not apply to bahiagrass, bentgrass (creeping, Seaside, Colonial), centipedegrass, St. Augustinegrass, carpetgrass, and golf course greens, tees, and collars. May be applied to home lawns. Apply to seedling grasses after second or third mowing, or 28 days after emergence. Wait 3 to 4 weeks after sodding, sprigging, or plugging operations to apply. Wait 4 weeks after application to seed.

Postemergence Control

Herbicide and Formulation

(Q4 Plus) 1.79 L

Amount of Formulation per 1,000 sq ft

1.8 to 3 fl oz

Amount of Formulation per Acre

5 to 8 pt

Pounds Active Ingredient per Acre

1.12 to 1.79

Precaution and Remarks

Contains 0.25 lb ai per gal more quinclorac than Q4. Same statements as above except can be applied to actively growing bermudagrass after spring greenup but use only 5 to 7 pt per acre.

Postemergence Control

Herbicide and Formulation

quinclorac + 2,4-D amine + dicamba, MOA (27 + 4) + 4 + 4 (Quincept) 1.875 SL

Amount of Formulation per 1,000 sq ft

2.57 to 2.94 fl oz

Amount of Formulation per Acre

7 to 8 pt

Pounds Active Ingredient per Acre

1.64 to 1.875

Precaution and Remarks

For use in residential and nonresidential cool season turf, including athletic fields, golf courses, and sod farms. Do not use on centipedegrass, St. Augustinegrass, bahiagrass, zoysiagrass, bermudagrass, bentgrass, or dichondra. Can apply to tolerant turfgrass seedlings after third mowing, and to newly sodded, sprigged, or plugged grasses 3 to 4 weeks after operations.

Postemergence Control

Herbicide and Formulation

quinclorac + mecoprop + dicamba, MOA (27 + 4) + 4 + 4 (Onetime) 2.45 SL

Amount of Formulation per 1,000 sq ft

0.5 to 1.45 fl oz

Amount of Formulation per Acre

0.68 to 2 qt

Pounds Active Ingredient per Acre

0.4165 to 1.225

Precaution and Remarks

For use in warm- and cool-season residential and non-residential turf, including but not limited to commercial property, parks, roadsides, schools, athletic fields, cemeteries, and golf courses. May be applied to species of bermudagrass, bluegrass, fescue, and ryegrass as well as creeping bentgrass, seashore paspalum, and zoysiagrass. Use with methylated seed oil at 1.5 pint per acre. Allow 28 days of seedling or sprig growth before application. If treating first, allow 28 days before seeding or sprigging. Do not apply to golf course collars or greens or to turf grown for sod. Use low rate in 2 split applications when treating creeping bentgrass.

Postemergence Control

Herbicide and Formulation

carfentrazone + quinclorac, MOA 14 + (27 + 4) (SquareOne) 75 WG

Amount of Formulation per 1,000 sq ft

0.184 to 0.413 oz

Amount of Formulation per Acre

8 to 18 oz

Pounds Active Ingredient per Acre

0.35 to 0.79

Precaution and Remarks

Can use up to 12 ounces per acre 7 days after emergence from seed or sod installment on bluegrass and fescue species and perennial ryegrass. 18 ounces per acre can be used 7 days after seed, sod or sprig operations on bermudagrass species, centipedegrass and seashore paspalum. Wait 14 days after emergence for zoysiagrass. May apply to residential, commercial, and institutional lawns, athletic fields, sod farms, and golf course fairways and roughs. Adjuvants not required but may help on mature weeds.

Postemergence Control

Herbicide and Formulation

sulfentrazone + quinclorac, MOA 14 + (27 + 4) (Solitare) 75 WG

Amount of Formulation per 1,000 sq ft

0.367 to 0.735 oz

Amount of Formulation per Acre

1 to 2 lb

Pounds Active Ingredient per Acre

0.75 to 1.5

Precaution and Remarks

Use up to 21 ounces per acre on well-established tall fescue, Kentucky bluegrass and perennial ryegrass; up to 32 ounces per acre on well-established bermudagrass, centipedegrass, zoysiagrass and seashore paspalum. May be applied to residential, commercial, and institutional lawns, athletic fields, sod farms, and golf course fairways and roughs. After treatment, wait at least 1 month before reseeding, overseeding (use slit seeder for best results), or sprigging. Wait at least 3 months for sod establishment and do not spray within 3 months of harvest. Controls goosegrass in the 1 to 4 leaf stage. Yellow nutsedge and kyllinga species are also controlled. Do not apply with a spray adjuvant.

Postemergence Control

Herbicide and Formulation

thiencarbazone-methyl + iodosulfuron + dicamba, MOA 14 + 2 + 4 (Celsius WG) 68 WG

Amount of Formulation per 1,000 sq ft

0.057 to 0.113 oz

Amount of Formulation per Acre

2.5 to 4.9 oz

Pounds Active Ingredient per Acre

0.106 to 0.208

Precaution and Remarks

For use by licensed applicators in residential and commercial lawns, golf courses (excluding greens), sports fields, parks, recreational areas, roadsides, school grounds, and sod farms. Provides up to 60 days residual control. Use on bermudagrass, zoysiagrass, centipedegrass, and St Augustinegrass. Apply maximum 7.4 ounces per acre per season. Safe to use at high temperatures. Ryegrass can be overseeded 2 weeks after application. Apply 30 days prior to seeding bermudagrass or zoysiagrass. Wait 2 weeks after bermudagrass seedlling emergence or sprigging operation before applying. For zoysiagrass, wait 3 weeks after seedling emergence before applying. A nonionic surfactant or methylated seed oil at 0.25% v/v is required for optimum control.

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

asulam, MOA 18 (Asulox) 3.34 SL

Amount of Formulation per 1,000 sq ft

1.8 fl oz

Amount of Formulation per Acre

5 pt

Pounds Active Ingredient per Acre

2

Precaution and Remarks

Use only on St. Augustinegrass and Tifway 419 turf. On golf courses, use only on fairways and roughs.

Postemergence Control

Herbicide and Formulation

imazapic, MOA 2 (Plateau DG) 70 DG

Amount of Formulation per 1,000 sq ft

0.032 to 0.066 oz

Amount of Formulation per Acre

1.43 to 2.86 oz (1 to 2 water soluble packs)

Pounds Active Ingredient per Acre

0.063 to 0.125

Precaution and Remarks

For use on centipedegrass only when grown as fine turf in nonresidential areas such as commercial and industrial turf, golf courses, and other recreational areas. Not for use in home lawns. Do not use on other turfgrass species. See label for mixing instructions of water soluble packs. A repeat application may be needed on tough to control perennial weeds such as bahiagrass. The highest labeled rate may discolor centipedegrass by causing a red color.

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; 2 - 9 spikelets arising from different points along the top of stems

largecrabgrass dsc 7645
largecrabgrass dsc 7645
largecrabgrass dsc 7645
largecrabgrass dsc 7646
largecrabgrass dsc 7646
largecrabgrass dsc 7646
seedhead2
seedhead2
seedhead2
Vernation type

leaves rolled in the bud

leafbladewidth
leafbladewidth
leafbladewidth
Ligule Type

membranous; 0.04 - 0.08 inches (1 - 2 mm) long, rounded to sharp pointed, toothed, often reddish

ligule2
ligule2
ligule2
Growth Season/Life Cycle

summer annual weed

Auricle type

absent

hairy
hairy
hairy
ligule2
ligule2
ligule2
Leaf blade tip shape

sharp-pointed; covered with short hairs on both surfaces, sharply creased below, edges rough with scattered hairs

leafblade
leafblade
leafblade
leafblade2
leafblade2
leafblade2
Leaf blade width

0.2 - 0.6 inches (5 - 15 mm) wide

leafblade
leafblade
leafblade
leafblade2
leafblade2
leafblade2
leafbladewidth
leafbladewidth
leafbladewidth
Stolon Presence

present

rootingnodes
rootingnodes
rootingnodes
stolon2
stolon2
stolon2
Rhizome Presence

absent

Collar Type

indistinct, mostly divided, hairy edges

collar2
collar2
collar2
collar3
collar3
collar3
Sheath Margin

open

sheathmargin
sheathmargin
sheathmargin
Sheath Type

flattened; sheath has long hairs; often with purple veins