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Management of group A herbicide resistant barley grass in pasture phase

Authors: Ben Fleet1, Amanda Cook2, Ian Richter2, Wade Shepperd2, Chris Preston1 and Gurjeet Gill1

1School of Agriculture, Food & Wine, University of Adelaide 2Minnipa Agricultural Centre, SARDI

Funded By: GRDC UA00149

Key Words: herbicide, resistance, barley grass, pasture, weed management

Key Messages

  • At present, group A herbicide resistance in barley grass is relatively low at a district level on the Eyre Peninsula (EP). However, group A resistant populations of barley grass can be much more common in other areas of the state. Growers need to act now to integrate multiple control tactics to prolong the effectiveness of these cheap and effective herbicides.
  • Even without using group A herbicides, it is possible to achieve large reductions in barley grass seed bank in a legume pasture phase.
  • When using moderate efficacy-low cost herbicides (Treflan + Logran) for barley grass control in wheat, effective control of the weed in previous pasture phase was essential.
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