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Old World Diamond-Flower Biology and Management in Turf1

Darcy E. P. Telenko, Barry J. Brecke, Ramon Leon, and J. Bryan Unruh 2

Old world diamond-flower (Hedyotis corymbosa) is a smooth, spreading summer annual. It has branched stems with opposite, narrow leaves. Flowers are white, usually with two or more on long stalks extending from the tip of a common long stalk. Flowers occur from midsummer until frost. Reproduction occurs by seed. Found in moist areas, especially areas that have been disturbed.

 

Figure 1. Old world diamond-flower
Figure 1.  Old world diamond-flower
Credit: B. Brecke

 

 

Figure 2. Old world diamond-flower
Figure 2.  Old world diamond-flower
Credit: D.E.P. Telenko

 

 

Figure 3. Old world diamond-flower patches in grass
Figure 3.  Old world diamond-flower patches in grass
Credit: B. Brecke

 

Herbicide Options for Controlling Old World Diamond-Flower in Florida Turfgrass

(Always refer to the label for specific uses, application rates, and turfgrass tolerance.)

Refer to the publication Pest Control Guide for Turfgrass Managers at https://nwdistrict.ifas.ufl.edu/phag/files/2015/04/2012_UF_Pest_Control_Guide.pdf for brand names associated with chemical names listed.

Bermudagrass

  • Preemergence: none

  • Postemergence: carfentrazone

St. Augustinegrass

  • Preemergence: none

  • Postemergence: atrazine, carfentrazone

Centipedegrass

  • Preemergence: none

  • Postemergence: atrazine, carfentrazone

Bahiagrass

  • Preemergence: none

  • Postemergence: carfentrazone

Seashore paspalum

  • Preemergence: none

  • Postemergence: carfentrazone

Zoyziagrass

  • Preemergence: none

  • Postemergence: atrazine, carfentrazone

Perennial ryegrass

  • Preemergence: none

  • Postemergence: carfentrazone

Publication #ENH1232

Date:November 13th, 2019

Related Experts

Unruh, Joseph Bryan

Specialist/SSA/RSA

University of Florida

Brecke, Barry J

Specialist/SSA/RSA

University of Florida

Leon, Ramon

external

University of Florida

  • Critical Issue: Agricultural and Food Systems
Management

Contacts

  • Joseph Unruh
  • Pawel Petelewicz