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
Preemergence Control
MSMA, MOA 17 (6 SL, 6.6 SL) (various brands) several concentrations 1.82 to 4.5
Precaution and Remarks: MSMA is only registered for golf course, sod farm, and highway right-of-way use. Bermudagrass, bluegrass and zoysiagrass are tolerant. Injury may result on bentgrass, fescue and also St. Augustinegrass grown for 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.
MSMA, MOA 17 (6 SL, 6.6 SL) (various brands) + metribuzin, MOA 5 (75 DF) (Sencor) several concentrations
+
0.17 to 0.33 lb
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.
asulam, MOA 18 (3.34 SL) (Asulox) 1.8 fl oz 5 pt 2
Precaution and Remarks: Use only on St. Augustinegrass and Tifway 419 turf. On golf courses, use only on fairways and roughs.​

Species Data

  • SEEDHEAD / FLOWER
  • 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
      Figure 10
  • LEAF BLADE WIDTH
    • 0.08 - 0.24 inches (2 - 6 mm) wide
  • 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
      Figure 11
Sandbur seedheadFigure 1. Sandbur seedhead.Sandbur seedheadFigure 2. Sandbur seedhead.Sandbur seedheadFigure 3. Sandbur seedhead.Sandbur seedheadFigure 4. Sandbur seedhead.Sandbur seedheadFigure 5. Sandbur seedhead.Sandbur seedheadFigure 6. Sandbur seedhead.Sandbur seedheadFigure 7. Sandbur seedhead.Sandbur seedheadFigure 8. Sandbur seedhead.Sandbur seedheadFigure 9. Sandbur seedhead.Sandbur  leaf blade widthFigure 10. Sandbur leaf blade width.Sandbur sheathFigure 11. Sandbur sheath.