Small Grain Weed Control

Mark VanGessel, Extension Weed Specialist; mjv@udel.edu

With the mild winter that we have had, small grain fields should be scouted for weeds, and applications should be made before the weeds get too large.

Be sure to read the herbicide label carefully because some products can be tankmixed with nitrogen but only if the nitrogen is no more than 50% of the spray solution (nitrogen is mixed 1:1 with water). A few specifics:

    · Osprey cannot be applied within 14 days of nitrogen application.
    · Harmony Extra can be applied with nitrogen, but use of surfactant differs depending on concentration of nitrogen and targeted weed species.
    · Axial XL and PowerFlex can only be applied with nitrogen if it is mixed 1:1 with water; also PowerFlex cannot be applied with nitrogen if the amount is more than 30 lbs of N/A.

Be sure to consider your rotation after small grains when you select your herbicides. Harmony Extra is very flexible for vegetable rotations; and Starane Ultra and Axial may require up to 120 days; while Osprey and PowerFlex cannot be rotated to vegetables for 9 to 12 mos. The most restrictive are Finesse and Maverick, which cannot be rotated to vegetables and require use of STS soybeans.


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