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Publication #ENH1232

Old World Diamond-Flower Biology and Management in Turf1

Darcy E. P. Telenko, Barry J. Brecke, Ramon Leon, and J. Bryan Unruh2

Old world diamond-flower (Hedyotis cormybosa) 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


Credit:

B. Brecke


[Click thumbnail to enlarge.]

Figure 2. 

Old world diamond-flower


Credit:

D.E.P. Telenko


[Click thumbnail to enlarge.]

Figure 3. 

Old world diamond-flower patches in grass


Credit:

B. Brecke


[Click thumbnail to enlarge.]

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, Gainesville 32611. Original publication date December 2013. 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. Visit the EDIS Web Site at http://edis.ifas.ufl.edu.

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, 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.