Updated 10/20/2022 includes recommendations if you do or don’t have a restricted use pesticide license.
When planting open pollinated corn it is highly recommended that you have a good weed management plan.
Keep in mind that our seed corn is open pollinated and non-gmo… if roundup (glyphosate) touches it it will die.
If using herbicides always read and follow the label! :
Things to consider: weeds that are up, weeds that you expect to see, following crop, cost, time, use restrictions.
Suggested corn herbicide program for 2023 always read and follow the label!
*Costs are approximates and are likely to vary.
2023 Suggested Herbicide Plan includes residual herbicides to control grasses and broad leaves.
Goals: no weeds until corn is taller than 1ft
approximate prices are included.
No spray license? Check out this no-till plan:
2-3 weeks before planting (around April 10 if you hope to plant April 24)
- Brawl II choose the max labeled rate for your soil type 1-2 pints will cost $11 / ac up to $21 / acre.
- Glyphosate $8.50 / acre.
- Ammonium sulfate makes the glyphosate work better (sprayable) $1.40
- Sharpen herbicide if you have any marestail or any glyphosate resistant broad leaf weeds. $6.95 – $14.00 / acre **do not use sharpen for fresh market sweet corn unless the label allows it.
- **If you have a pesticide license a little atrazine will help here. Atrazine 90 DF 0.6lbs / ac $3.60/acre
If you have green weeds sprouting prior to planting then spray another dose of glyphosate before planting or before the corn emerges. (you can only get away with spraying glyphosate after planting and before emergence if the furrow is closed very well and no risk of rain that day)
Post Emerge Corn (after grass weeds like foxtail start growing but before the weeds are taller than 2 inches) This comes around very quickly as you may still have corn to plant. You will want to have the following on hand because if 2023 is like 2022 sometimes you have to wait on an order.
Make sure you have thoroughly rinsed you spray tank. Just a little bit of glyphosate can cause stunting and hurt ear development.
- Laudis 3 oz / acre $13.60
- Primero 0.5 oz / acre $7
- Use MSO (methylated seed oil) 1 gallon / 100 gallons of spray mix
- Ammonium sulfate (sprayable) 8.5 lbs / 100 gallons of spray mix.
- ***If you have a pesticide license Atrazine 90 DF works well here. Atrazine 90 DF .6 lbs /ac $3.60 / ac
If any Broadleaf escapes ie. Morning glory, ragweed (Laudis seems to be better on ragweed than Mesontrione is)..
- Status at 3 oz costs $14.00
Hopefully you don’t have additional grass escapes but if you do you will need to use
- Accent Q at up to .9 oz / acre costing about $19.00 along
2. Crop Oil Concentrate (can cause injury so use slightly lower than recommended rate)
3. Ammonium sulfate 8.5 lbs / 100 gallons of spray in the tank.
*Suggested corn herbicide program for 2023 always read and follow the label!
Foxtails are usually the biggest challenge for conventional corn and must be controlled early. S-Metolachlor will not kill any foxtail that is emerged.
S-Metolachlor is the new formulation of Metolachlor. Herbicides with S-Metolachlor will likely be more effective than the Me-TOO-Lachlor II recommended but they are also more expensive. If you are concerned about application timing or have a lot of foxtail seed from previous years you may want to use the S-Metolachlor formulation for instance Brawl II.
Read the labels and consider your next crop when choosing herbicides.
Contact us we will try to help you develop a plan that will work for you.
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