Carpetweed

Description

Carpetweed is a small weed that can cover large patches of ground in a very small time. This summer annual weed has smooth stems and leaves, and white flowers in the joint between leaf and stem. Carpetweed flowers from July to September.

Cultural Control

Maintain a dense, actively growing turf through proper mowing, fertilizing, and watering practices. Mow at the proper height for your selected adapted turfgrass. Coring and traffic control reduce compaction and encourage desirable turfgrass competition. It is best to control this summer annual broadleaf weed in late spring or early summer because it is easier to control at this time and the turf will have a greater chance of recovering the areas previously occupied by weeds.

Chemical Control

Herbicide and Formulation Amount of Formulation per 1,000 sq ft Amount of Formulation per Acre Pounds Active Ingredient per Acre
Preemergence and Postemergence Control
mesotrione, MOA 27 (4 SC) (Tenacity) 0.092 to 0.183 fl oz 4 to 8 fl oz 0.125 to 0.25
Precaution and Remarks: Use on residential turf, golf courses (not greens) and sod farms for pre- and postemergence weed control. Tolerant turfgrasses include St. Augustinegrass, centipedegrass, tall fescue, fine fescue, Kentucky bluegrass, and perennial ryegrass. Add a nonionic surfactant and repeat application after 2 to 3 weeks for improved postemergence control. Tank mix with prodiamine 65 WG for extended preemergence grassy weed control. Can be applied at seeding to all tolerant grasses except fine fescue. After turf germination, wait 4 weeks or until turf has been mowed twice before making a postemergence application. Also controls henbit, chickweed, dandelion, white clover, Florida betony, Florida pusley, ground ivy, oxalis, wild violet, creeping bentgrass, and yellow nutsedge.
[sulfentrazone + prodiamine], MOA 14 + 3 (4 SC) (Echelon) 0.184 to 0.826 fl oz 0.5 to 2.25 pt 0.25 to 1.125
Precaution and Remarks: For use in residential and institutional lawns, athletic fields, sod farms, golf course fairways and roughs, roadsides, utility right-of-ways, railways, and industrial areas. Apply to turf following a second mowing if a good root system has been established. Apply up to 12 fluid ounces per acre to bentgrass at 0.5 inch or higher, fine fescue, and perennial ryegrass. Apply 18 to 24 fluid ounces per acre to perennial bluegrass, tall fescue, and all warm season grasses except St. Augustinegrass (do not apply) and bermudagrass (apply 18 to 36 fluid ounces per acre). For sod production, apply 6 months after establishment, and do not harvest within 3 months. Do not apply with adjuvants or surfactants. [Sulfentrazone + prodiamine should not be applied to cool-season turf with N-containing fertilizers unless some short-term discoloration is tolerable.
Herbicide and Formulation Amount of Formulation per 1,000 sq ft Amount of Formulation per Acre Pounds Active Ingredient per Acre
Postemergence Control
2,4-D amine, MOA 4 (4 SL) (various brands) 3 to 4 tsp 1.5 to 2 pt 0.75 to 1
Precaution and Remarks: Cut rate one-half for bentgrass, carpetgrass, centipedegrass, and St. Augustinegrass. Spray when weeds are young and actively growing. To reduce danger of injury to flowers and ornamentals by spray drift, use low pressure and do not spray on windy days.
pyraflufen ethyl, MOA 14 (0.177 SC) (various brands) 0.016 to 0.092 fl oz 0.7 to 4 fl oz 0.000938 to 0.0055
Precaution and Remarks: Used in established sod farm and ornamental turf by commercial applicators and professional landscapers only. Turf can be newly seeded, sodded, or sprigged as long as it is established and not under stress. Tolerant turfgrasses include bermudagrass, centipedegrass, St. Augustinegrass, zoysiagrass, tall fescue, perennial ryegrass, perennial bluegrass, and creeping bentgrass (not greens or tees). Apply 1 to 4 fluid ounces alone to 3- to 6-inch tall weeds. For larger weeds and broader spectrum control, apply 0.75 to 1.5 fluid ounces and tank mix with 2,4-D, mecoprop, dicamba, chloroprop, MCPA, triclopyr, or fluroxypyr.​

Species Data

  • GROWTH SEASON / LIFE CYCLE
    • summer annual weed
  • GROWTH HABIT
  • LEAFLET NUMBER
  • LEAF MARGIN
    • smooth
  • LEAF HAIRS
    • none
  • LEAF / LEAFLET SHAPE
    • oval / egg-shaped / elliptical
  • LEAF WIDTH
    • 12 - 1 inch
  • LEAF VENATION
    • pinnate
  • LEAF ARRANGEMENT
    • whorled or basal rosette
  • ROOT TYPE
    • fibrous; taproot
  • FLOWER COLOR
Carpetweed growth habit.Figure 1. Carpetweed growth habit.Carpetweed growth habit.Figure 2. Carpetweed growth habit.Carpetweed growth habit.Figure 3. Carpetweed growth habit.Carpetweed growth habit.Figure 4. Carpetweed growth habit.Carpetweed leaf number.Figure 5. Carpetweed leaf number.Carpetweed flower color.Figure 6. Carpetweed flower color.flower color.CarpetweedFigure 7. Carpetweed flower color.Carpetweed flower color.Figure 8. Carpetweed flower color.

Written By

Photo of Dr. Charles PeacockDr. Charles PeacockProfessor and Extension Turfgrass Specialist (919) 515-7615 charles_peacock@ncsu.eduCrop and Soil Sciences - NC State University
Was the information on this page helpful? Yes check No close

This Extension factsheet can also be viewed at:
https://content.ces.ncsu.edu/carpetweed