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1 July 2011 Herbicide Management of Umbrella Dracaena (Dianella ensifolia) in a Florida State Park
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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.

Nomenclature: Umbrella dracaena; Dianella ensifolia (L.) DC. (Hemerocallidaceae) DNLEN; also known as cerulean flax lily.

Interpretive Summary: In this study, we evaluated chemical control of umbrella dracaena (Dianella ensifolia), which is currently problematic in a single state park in Florida but is spreading outside the park. We found that two biannual spot treatments with imazapyr (3.2 g ai L−1) or metsulfuron (0.08 g ai L−1) reduced D. ensifolia cover to 1 and 3%, respectively, at 12 mo under field trials, but no treatment eliminated the plant. Although our results indicate two herbicide treatments will reduce D. ensifolia cover by > 97%, additional follow-up treatments will be required for long-term control of this plant in the park and to eliminate its spread outside the park. Because D. ensifolia is primarily localized in one specific 40-ha area of a state park, funding should be earmarked to eradicate this plant before it continues to spread to other natural areas in Florida and possibly other states.

Weed Science Society of America
Jeffrey T. Hutchinson, Elizabeth A. Gandy, and Kenneth A. Langeland "Herbicide Management of Umbrella Dracaena (Dianella ensifolia) in a Florida State Park," Invasive Plant Science and Management 4(3), 349-355, (1 July 2011).
Received: 26 October 2010; Accepted: 1 April 2011; Published: 1 July 2011

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