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06
May
2014
Controlling Ryegrass Late
Author: Larry Steckel, Extension Weed Specialist 2 Comments

Ryegrass questions have become much more prevalent this week.  I have had no good answers for the calls on how to control ryegrass that escaped the glyphosate burndown in emerged corn.  Herbicides like Accent or Steadfast will not control ryegrass. Liberty tankmixed with atrazine on LL corn would burn the ryegrass back some and is the only even fair option that is available.

In cotton or soybean the best option is a clethodim based system. In the Mississippi Delta where the ryegrass is 100% resistant to glyphosate they are utilizing 16 ozs of Select Max as their best treatment and still not getting complete control.  In Tennessee, where the ryegrass population ranges in glyphosate tolerance from moderate to in some locations highly resistant, a tankmix of clethodim (Select Max 10 ozs) plus glyphosate (Roundup PowerMax 32 ozs) has proven to be effective. Both cotton and soybeans can be planted back immediately after a clethodim application.

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2 Responses to Controlling Ryegrass Late

  1. Roger says:

    What rate of Gramoxone and metribuzin would you use.

    • Larry Steckel, Extension Weed Specialist says:

      Roger

      Thanks for the comment. On large horseweed I would go with 48 ozs/A of Gramoxone plus 4 ozs of metribuzin.

      Larry