Greenhouse experiments were conducted to evaluate mile-a-minute response to selected herbicides. In the first experiment, mile-a-minute response was evaluated following the application of aminocyclopyrachlor, aminopyralid, fluroxypyr, glufosinate, glyphosate, imazamox, imazapic, metsulfuron, penoxsulam, and triclopyr. Applications of aminocyclopyrachlor, aminopyralid, fluroxypyr, glufosinate, glyphosate, and triclopyr all resulted in mile-a-minute control 70% or greater 8 wk after treatment (WAT). Mile-a-minute sensitivity to these six herbicides was further evaluated in a dose-response study. Although 90% growth reduction (GR₉₀) values were determined for aminopyralid and glyphosate, statistically significant results were not obtained for aminocyclopyrachlor, fluroxypyr, glufosinate, and triclopyr. The results of these experiments suggest that glyphosate, as well as the synthetic auxin herbicides aminocyclopyrachlor, aminopyralid, fluroxypyr, and triclopyr, should be further evaluated for mile-a-minute control in south Florida.

Nomenclature: Aminocyclopyrachlor, aminopyralid, fluroxypyr, glufosinate, glyphosate, imazamox, imazapic, metsulfuron, penoxsulam, triclopyr, mile-a-minute, Mikania micrantha Kunth.

Management Implications: Mile-a-minute is an aggressive vine that is very difficult to control in natural areas, lawns, forests, plantation crops, pastures, and other ecosystems throughout Australia, India, and southeast Asia. It was discovered in southern Florida in 2009. Limited information exists regarding the efficacy of recently developed postemergence herbicides on mile-a-minute. Mile-a-minute growth was measured following the application of the herbicides aminocyclopyrachlor, aminopyralid, fluroxypyr, glufosinate, glyphosate, imazamox, imazapic, metsulfuron, penoxsulam, and triclopyr to plants grown in a greenhouse. Imazamox, imazapic, metsulfuron, and penoxsulam did not effectively control mile-a-minute. The herbicides aminocyclopyrachlor, fluroxypyr, and triclopyr provided the greatest control of mile-a-minute. Glufosinate and glyphosate also provided acceptable control. These results indicate that mile-a-minute can potentially be controlled by herbicide applications; however, additional research is necessary to evaluate long-term management strategies for mile-a-minute in south Florida.