Proactive Weed Management



mature palmer amaranth

Weed Management

Proactive, successful weed management happens across multiple growing seasons and takes planning to make sure you stay ahead of resistant weeds. Herbicide considerations and other crop inputs are important decisions that will ultimately influence yields.

Farmers in the Midwest need a diverse toolbox of products and management practices to combat the build-up of weed resistance. This goal is difficult to achieve in reality because when a particular weed management practice is working well and is economically attractive, it is tempting to continue with it despite knowing that reliance on a single practice significantly increases selection pressure, which leads to resistance.

Applying Integrated Weed Management practices can help delay resistance, and may also lead to a decrease in the density of a resistant population. Whether you’re dealing with waterhemp, pigweed, ragweed, or an unidentified weed, this requires that the problem is identified and addressed with a dedicated program over a longer period of time.



Waterhemp leavesWatch for Waterhemp

Scouting early and treating often can help keep fast-growing waterhemp from establishing a foothold in your fields.

» Learn more about waterhemp




Spiny pigweed & redroot pigweed seedling

Keeping Pigweed Under Control

Being on constant lookout for signs of pigweed will help prevent resistant weed growth in your fields.

» Learn more about pigweed




Ragweed close-up with vibrant green leaves

Getting Rid of Ragweed

Aggressive, year-round resistance management is critical to keeping ragweed from beating your crops.

» Learn more about ragweed



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University Guides

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Identifying Waterhemp

Although a member of the pigweed family, along with Palmer amaranth and redroot pigweed, waterhemp features several characteristics that differentiate it from other pigweed varieties. In the waterhemp seedling stages, look for the following features:

  • First true leaves appear generally longer and more spear shaped than other pigweeds.
  • Seedlings are hairless and have leaves that look waxy or glossy.
  • When rubbed between the fingers, mature flowers reveal the small, shiny, black seeds found only on female plants.
waterhemp infographic

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