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Fall and Spring Burndown Considerations

Fall and Spring Burndown Considerations published on No Comments on Fall and Spring Burndown Considerations

Fall and Spring Burndown Considerations

Josh Copes, Daniel Stephenson, and Donnie Miller

 

This time of year, especially when it is dry, brings about questions concerning a fall burndown application that contains a residual herbicide.  As with any field operation, fall burndown should provide a monetary benefit.  A lot of time and money is spent after harvest preparing fields for planting next spring.  Producers should realize that some fall-applied residual herbicides will provide control of most winter annuals which may result in excess soil and bed erosion.  So, you may be asking why apply a fall burndown?  If glyphosate-resistant Italian ryegrass along with some other winter annual weeds like henbit are an issue, research has shown that a fall residual herbicide application will provide good to excellent control the following spring.  The table below is a glyphosate-resistant Italian ryegrass weed control program developed by Mississippi State University weed scientists that LSU AgCenter weed scientists have adopted.  The fall-applied herbicides listed in the table will provide some control of henbit as well.

To combat glyphosate-resistant Italian ryegrass, many producers tank-mix Select Max/clethodim in their spring burndown.  Unfortunately, several phone calls were received this past spring concerning Italian ryegrass control failures following Select Max/clethodim application.  If controlling Italian ryegrass has been an issue and control failures with clethodim products has occurred, one of the Fall programs in the Table 1 should be utilized.

Regardless of the crop planted in the spring, the LSU AgCenter suggest applying a spring burndown 4 to 6 weeks prior to planting.  This gives plenty of time for weeds to die and break the “green bridge” and for soil residual herbicides, if applied, will keep the fields weed free until planting.  If planting corn, a soil residual herbicide applied in the fall may provide weed control until corn planting time.  Therefore, a fall residual herbicide can pay and keep the field weed free until planting.  If you plan on planting soybeans or cotton however, a fall-applied soil residual herbicide may not be the best choice.  In some years, soil residual herbicides can provide weed control up to 120 days.  If applied in early-December, you could expect good weed control until mid to late March.  We must remember that if a fall-applied residual herbicide is applied in December with the hopes of skipping a spring burndown, you are making a mistake.  Don’t assume a fall-applied residual herbicide will hold through spring.  Fields must be scouted.

When burning down fields near planting, herbicide selection and rate and spray coverage are very important to ensure complete control.  If mare’s-tail, henbit, cutleaf evening-primrose, and sowthistle are present, be sure to apply 2,4-D at 1 lb of acid equivalent per acre.  In many instances, when weed control is unsatisfactory from spring burndown, it is because 2,4-D rates that were too low or 2,4-D was not applied at all.

The main goal of any burndown operation is to be weed free at the time of planting.  Choice of fall or spring burndown will depend on what crop you intend to plant, if Italian ryegrass an issue, and if soil and bed erosion a problem.  Spending more money than necessary is a big concern when deciding on burndown.

 

Glyphosate-resistant Italian ryegrass control recommendations. Adopted from Mississippi State University.

 Crop Fall Winter Spring
Corn Dual Magnum @ 1.33 pt/A or Zidua @ 2.5 oz/A double disk Select Max @ 12-16 oz/A or equivalent rate of 2 lb clethodim formulation Paraquat @ 0.75-1.0 lb of a.i. or two applications 10-14 days apart
Cotton Dual Magnum @ 1.33 pt/A or

trifluralin @ 3 pt/A or double disk

Select Max @ 12-16 oz/A or equivalent rate of 2 lb clethodim formulation Paraquat @ 0.75-1.0 lb of a.i. or two applications 10-14 days apart
Soybean Dual Magnum @ 1.33 pt/A or

Boundary @ 2 pt/A or trifluralin @ 3 pt/A or double disk

Select Max @ 12-16 oz/A or equivalent rate of 2 lb clethodim formulation Paraquat @ 0.75-1.0 lb of a.i. or two applications 10-14 days apart
Rice Command @ 2 pt/A or double disk Select Max @ 12-16 oz/A or equivalent rate of 2 lb clethodim formulation Paraquat @ 0.75-1.0 lb of a.i. or two applications 10-14 days apart

http://mafes.msstate.edu/publications/information-sheets/i1359.pdf

 

Please feel free to contact us with any concerns or questions.

 

Josh Copes

Cell: 318-334-0401

Office: 318-766-4607

jcopes@agcenter.lsu.edu

 

Donnie Miller

Cell: 318-334-0401

Office: 318-766-4607

dmiller@agcenter.lsu.edu

 

Daniel Stephenson

Cell: 318-308-7225

Office: 318-473-6590

dstephenson@agcenter.lsu.edu

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