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Post-Harvest Weed Control to Handle Some of the Worst Weeds

Best practices for using post-harvest weed control to manage invasive weeds.

A post-harvest burndown can help control some of the worst weeds before they can impact yields. Some of the toughest weeds, such as dandelion and narrow-leaved hawk’s-beard, are best controlled before spring.

A wet fall is great for weeds:

In a wet fall, winter annuals like flixweed, narrow-leaved hawk’s-beard (NLHB) and shepherd’s-purse, can really take off. They are better controlled in the fall before they can rob the soil of important spring moisture and nutrients.

Post-harvest better than pre-harvest:

Post-harvest burndown is often more effective than a pre-harvest herbicide application, as weeds establish better following the removal of the crop canopy.


Improve control of flixweed in October with a post-harvest application. You can still control it quite easily with a pre-seed burn-off in the spring, but, left to later spring applications, it can remove a lot of moisture.

Best practices for post-harvest weed control:

  • Plan to execute a post-harvest burndown strategy where possible
  • Allow time for weeds to re-grow before spraying as cooler temperatures mean slower growth and uptake of systemic herbicides
  • Use an add-in herbicide to increase glyphosate effectiveness and/or provide residual control
  • Add Express® SG or PrecisionPac® NC-0050 to maintain flexibility of re- cropping
  • For some residual control on key weeds, add Express® PRO or PrecisionPac® NC- 00439 if you are planning to seed cereals next spring
  • Follow up with a pre-seed burn-off

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