Plan for Early Spring Weed Emergence

Be ready with an aggressive weed-control plan for early spring weed emergence.

Be ready with an aggressive weed-control plan for early spring weed emergence.
It’s no secret that the best weed control begins early. That’s why you shouldn’t depend on typical spring weather conditions if you had misses in your fields the prior season. Be ready to implement a more aggressive control plan in case warm conditions lead to early spring weed emergence.

Relatively new weed species continue to invade the Midwest, with fast-growing Palmer amaranth documented in more than half of Iowa counties and about one-quarter of Ohio counties in 2017. Herbicide resistance has also become more widespread in the past few years, with some waterhemp in Iowa now demonstrating resistance to as many as five herbicide groups.

Preparing for early spring weed emergence and preventing herbicide-resistant weed populations requires a three-phase plan:

  • Be ready with an early burndown. The potential for heavy weed pressure early this spring increases the need for aggressive control, starting with a strong burndown herbicide. Winter annual weed growth can tie up nutrients and create a green mat that interferes with planting. Controlling weeds early provides a cleaner seedbed and allows soils to warm sooner.
  • Control weeds before they emerge. For hard-to-control weeds and those with greater potential to develop resistance, including waterhemp, marestail and pigweeds, aim to make the herbicide application before they emerge.
  • Layer residual herbicides during the season. Use sequential herbicide applications to extend control and prevent weeds from gaining a foothold. Most preemergence herbicides provide around 30 days of control under normal field conditions. On fields where resistant weeds are suspected or have been documented, consider shortening the length of time between herbicide applications to provide residual overlap and ensure consistent weed control during the critical time for young crops.

If you weren’t able to make a fall herbicide pass, an application of DuPont™ Instigate® or Prequel® herbicide ahead of corn provides effective early burndown control of tough winter annual weeds.

To extend control of resistant weeds in soybeans, DuPont™ EverpreX™ herbicide provides early season control of ALS-, PPO- and glyphosate-resistant weeds, including waterhemp, Palmer amaranth and other pigweed escapes by providing a layer of residual control.

DuPont Prequel® is a restricted-use pesticide.

DuPont EverpreX, Instigate® and Prequel® are not registered for use in all states. Contact your local DuPont sales representative for details and availability.

The information provided on this website is for reference only. Always refer to the product labels for complete details and directions for use.