Two-Pass Versus One-Pass Weed Control Programs in Corn

Always start with a clean field using tillage or a burndown program that can include residual herbicides prior to planting. The following weed control programs using preemergence (PRE) and postemergence (POST) herbicides can be implemented at or near planting depending on the density and types of weeds in the field.​13;10;

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One-Pass PRE Program This program utilizes full labeled rates of preemergence residual products, like Degree Xtra® or Harness ® brand herbicides, and tank mixtures as appropriate, applied at or near planting.13;10;

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  • Target low risk fields with light weed infestations and no problem weeds such as large-seeded broadleaf weeds and perennials.
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  • Adequate and timely rainfall is essential for good activation of residual herbicides to help protect yield potential.
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One-Pass POST Program This program utilizes tank mixtures of labed POST and residual (PRE) herbicide products applied early-POST in the crop. The early-POST application needs to be made before weeds exceed 2 to 4 inches to avoid excessive crop competition.13;10;

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  • Target low risk fields with light weed pressure.
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  • Application timing is essential for effective weed control and to protect yield potential.
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Two-Pass (PRE followed by POST) Program This program offers the least risk and best chance at obtaining optimum weed control and corn yield potential. A PRE followed by POST program, where the POST treatment is applied mid-to late-POST, can provide more consistent weed control over a greater range of conditions.13;10;

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  • Target high risk fields with moderate or heavy weed pressure.
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  • Provides better consistency and a wider window for POST application.
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  • Helps minimize early-season weed competition that can reduce yield potential.
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See what RoundupReadyPLUS​ has to say about Two-Pass Versus One-Pass weed control programs in corn.

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