With a spring like this, we are starting to get questions about poor corn emergence and replanting issues.
There are times when corn (previously planted or volunteer) must be removed from a field with the intention of replanting a corn crop.
Extension agronomist Dwight Lingenfelter tells us tillage is one effective method, but it is not appropriate in no-tillage situations.
Use of glyphosate is highly effective for non-Roundup Ready corn. But the challenge is in removing Roundup Ready hybrids.
There are limited herbicides to consistently kill small corn plants. Gramoxone SL, Liberty and Select are three products that have shown the most activity.
Research conducted in this region with Gramoxone and Select demonstrated that Select was the most effective for corn 2 to 3 inches tall. For taller corn (4 to 6 inches tall), Gramoxone in combination with a photosystem II-inhibiting herbicide (metribuzin, Lorox, or atrazine) was the most effective.
Liberty is a third option, but it will not control LibertyLink hybrids. So here is what we suggest:
Use up to 6 ounces of Select Max with a nonionic surfactant at 0.25% volume per volume plus ammonium sulfate at 2.5 to 4 pounds per acre.
Do not use crop oil concentrates or methylated seed oil surfactant.
Wait a minimum of six days from time of application until planting corn due to risk of crop injury.
Select Max will also control corn hybrids containing Roundup Ready and LibertyLink stacked traits.
Another option is Gramoxone SL 2.0. Use 3 to 4.5 pints per acre (2 to 2.7 pints of the 3.0 SL formulation) in combination with metribuzin at 4 to 6 ounces per acre, Lorox at 1 pint per acre, or atrazine at 1 pounds per acre.
These photosystem II inhibitors are not added to control the corn but are used to slow down the Gramoxone activity, which improves the consistency of control.
A third option is Liberty 280 at 22 to 29 fluid ounces per acre.
Liberty has not been as consistent for control of corn as Gramoxone has, and will not control varieties with LibertyLink traits.
However, increasing the rate of Liberty (32 to 43 fluid ounces) should improve control.
May 27, 2021 at 05:15PM
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Understanding Herbicide Options for Controlling a Failed Corn Crop - Lancaster Farming
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