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
Credit: B. Brecke

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

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: 11/12/2019

Weed Biology and Management in Turf series

Environmental Horticulture

West Florida REC

RELATED TOPICS

Weed Biology and Management in Turf series

Critical Issue: Agricultural and Food Systems

About this Publication

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.

About the Authors

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.

Contacts

Joseph Unruh
Pawel Petelewicz