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Sandbur

Description

Sandbur can be a very troublesome weed in warm-season turf species. It is easily identified by the seedhead, which is a spike of tiny burs that can hurt when touched. This weed thrives in sandy soils, but can be controlled with certain herbicides when in the seedling stage.

Cultural Control

Sandbur can be a very troublesome weed in warm-season turf species. It is easily identified by the seedhead, which is a spike of tiny burs. This weed thrives in sandy soils. Maintaining a dense, vigorous turf is the first step in effective weed control. Cultural and management practices that enhance turfgrass growth generally reduce weed competition and encroachment. First, select adapted turfgrass cultivars for your area and then properly fertilize, mow, and water to encourage dense growth.

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

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.

Presentations

Publications

Species Data

Seedhead/Flower

spike; burs that occur all along a spike-like seedhead

p1080746 sandbur
p1080746 sandbur
p1080746 sandbur
p1080748 sandbur
p1080748 sandbur
p1080748 sandbur
p1080751 sandbur
p1080751 sandbur
p1080751 sandbur
p1080756 sandbur
p1080756 sandbur
p1080756 sandbur
plant
plant
plant
sandbur
sandbur
sandbur
sandbur dsc 1810
sandbur dsc 1810
sandbur dsc 1810
seedhead2
seedhead2
seedhead2
seedheads
seedheads
seedheads
Vernation type

leaves folded in the bud

Ligule Type

fringe of hairs 0.04 inches (1 mm) long, with 0.08 inch (2 mm) long hairs on each side

Growth Season/Life Cycle

summer annual or perennial weed

Auricle type

absent

Leaf blade tip shape

sharp-pointed; thin, flat, usually not hairy

Leaf blade width

0.08 - 0.24 inches (2 - 6 mm) wide

leaf attach
leaf attach
leaf attach
Stolon Presence

none, but stems decumbent

Rhizome Presence

present; very short

Collar Type

divided by midrib, distinct

Sheath Type

flattened; sheath is usually not hairy

field stem2
field stem2
field stem2