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Herbicide Management of Umbrella Dracaena (Dianella ensifolia) in a Florida State Park

Published online by Cambridge University Press:  20 January 2017

Jeffrey T. Hutchinson ,
Elizabeth A. Gandy  and
Kenneth A. Langeland
Jeffrey T. Hutchinson*
Affiliation:
University of Florida, Agronomy Department, Center for Aquatic and Invasive Plants, 7922 NW 71st Street, Gainesville, FL 32653
Elizabeth A. Gandy
Affiliation:
Florida Park Service, District 4 Administration, 1843 South Tamiami Trail, Osprey, FL 34229
Kenneth A. Langeland
Affiliation:
University of Florida, Agronomy Department, Center for Aquatic and Invasive Plants, 7922 NW 71st Street, Gainesville, FL 32653
*
Corresponding author's E-mail: jthutch@ufl.edu
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Abstract

We evaluated herbicide treatments for control of umbrella dracaena, locally invasive in central Florida. Biannual treatments of imazapyr (3.2 and 6.4 g ai L−1), metsulfuron (0.08 and 0.16 g ai L−1), and imazapyr (0.8 g ai L−1) plus glyphosate (19.9 g ai L−1) reduced cover to < 3% at 12 mo, but no treatment eliminated the plant. In contrast, a single treatment on individual potted plants in greenhouse trials was highly effective with ≥ 98% necrosis/chlorosis at 6 mo and no regrowth at 9 mo posttreatment for most treatments. Management of umbrella dracaena will require more than two herbicide treatments with imazapyr, metsulfuron, glyphosate, or a combination of these herbicides if eradication is to be achieved. Because it is currently problematic and localized in one specific area in about 40 ha, it should be a high management priority before it spreads throughout Florida and possibly other states.

Keywords

Umbrella dracaenaDianella ensifolia (L.) DC. (Hemerocallidaceae) DNLENalso known as cerulean flax lilyInvasive plantsnatural areasFloridaherbicide controlDianella ensifolia
Type
Case Study
Information
Invasive Plant Science and Management , Volume 4 , Issue 3 , September 2011 , pp. 349 - 355
Copyright
Copyright © Weed Science Society of America 

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