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15
Apr
2013
Ryegrass invasion heading north
Author: Bob Scott, Professor & Extension Weed Scientist
Clumps of ryegrass that survived initial burndown in crop field.

SURVIVORS — Clumps of ryegrass that have survived burndown. (Image by Bob Scott)

Glyphosate resistant ryegrass was discovered in southeastrn Arkansas more than three years ago, but has been slow to move north into the Natural State.

However, I recently traveled the counties just south of I-40 from Lonoke to Hughes, and observed many burndown fields where the problem is obviously growing (see pictures).  In these fields where only one or two clumps of ryegrass have survived, a burndown it would be good advice to tell the grower to go out there and pull these spots.

If a burndown fails on a larger scale, Select or Select MAX and gramoxone are all that are left chemical-wise. Watch the plant-back intervals on Select. Most likely for larger ryegrass, a two-pass option of gramoxone or gramoxone plus a PSII inhibitor (atrazine, diuron, metribuzin) depending on what you are planting, may be the best option.  Basically it consists of  two shots of gramoxone spaced about 7-14 days apart.  For more information see the MP44 which can be found at your county office or www.uaex.edu.

LONE RANGER -_ Clump of burndown-surviving ryegrass. (Image by Bob Scott)

LONE RANGER -_ Clump of burndown-surviving ryegrass. (Image by Bob Scott)

Based on work done here in Arkansas and by Dr. Jason Bond in Mississippi, we have added recommendations for fall burndown with residual options to the MP44, these include fall applications of Dual and other herbicides for complete ryegrass control programs.  This work was funded in part by Cotton Inc., the Arkansas Soybean and Wheat promotion boards and Industry.  We appreciate their support.


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