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 http://turf.ufl.edu/pdf/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

Footnotes

1. This document is ENH1232, one of a series of the Environmental Horticulture Department, UF/IFAS Extension. Original publication date November 2013. Reviewed October 2016. Revised November 2019. Visit the EDIS website at https://edis.ifas.ufl.edu. Adapted from: Tim R. Murphy, Daniel L. Colvin, Ray Dickens, John W. Everest, David Hall, and L.B. McCarty. Weeds of Southern Turfgrasses. University of Florida, 1992.
2. Darcy E. P. Telenko, postdoctoral research associate; Barry J. Brecke, professor emeritus; and Ramon Leon, assistant professor, Agronomy Department; and J. Bryan Unruh, professor, Environmental Horticulture Department, West Florida Research and Education Center; UF/IFAS Extension, Gainesville, FL 32611.