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MACARTNEY ROSE CONTROL WITH REPEATED HERBICIDE TREATMENTS

Applied Research

Brenda Glover
REGIONAL EXTENSION AGENT
ALABAMA COOPERATIVE EXTENSION SYSTEM
GREENSBORO

Abstract

Macartney rose (Rosa bracteata) is an aggressive thorny shrub that displaces forages and greatly hinders cattle grazing in rangelands and pastures of the southern United States. Over the last century, Macartney rose has proven to be extremely difficult to control even with high rates of soil residual herbicides such as picloram. However, recent introductions in herbicide chemistry warrant testing on this troublesome species. We conducted studies from 2009 to 2011 on two pastures near Eutaw, Alabama that were heavily infested with Macartney rose. We compared mowing and August applications of thirteen herbicide treatments that included certain combinations of aminopyralid, fluroxypyr, metsulfuron, picloram, triclopyr, and 2,4-D. Herbicide treatments were applied to the same rose clumps for two consecutive years and an additional mowing was done to one half of the rose clumps in each treatment six months after the second herbicide treatment. At 11 months after the initial treatment, mowing and all herbicide treatments performed  poorly and provided 35% control or less. At 12 months after herbicide retreatment (24 months after the initial treatment), picloram + 2,4-D and aminopyralid + metsulfuron, both followed by mowing, were the most effective treatments, providing 72 to 91% control. All other treatments provided less than 70% control of Macartney rose clumps. However, complete clump mortality was very low across all treatments and ranged from 3 to 32%. These studies indicate that Macartney rose suppression is possible with certain new herbicides, but complete clump kill is still lacking.

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Poster has NOT been presented at any previous NACAA AM/PIC

This poster is being submitted for judging. It will be displayed at the AM/PIC if not selected as a State winner. The abstract will be published in the proceedings.

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Authors: B.S. Glover, J.B. Gladney, S.F. Enloe
  1. Glover, B. REGIONAL EXTENSION AGENT, ALABAMA COOPERATIVE EXTENSION SYSTEM, Alabama, 35744
  2. Gladney, J. REGIONAL EXTENSION AGENT, ALABAMA COOPERATIVE EXTENSION SYSTEM, Alabama, 35401
  3. Enloe, S. EXTENSION SPECIALIST, ALABAMA COOPERATIVE EXTENSION SYSTEM, Alabama, 36849