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Fight Herbicide Resistance in Soybeans

February 8, 2017
Agronomic image of pigweeds in soybean fields

From giant ragweed in Minnesota to Palmer pigweed in Mississippi, the reality is that there are a number of herbicide-resistant weeds in soybean fields across the U.S. Herbicide-resistant weed species can become a serious problem when a single herbicide or when multiple herbicides with similar modes of action are used repeatedly – this puts pressure on species to develop resistance.

Uncontrolled weeds compete with crops for water, nutrients and sunlight, and have the potential to harbor insects and diseases, which can infest fields and negatively affect future crops.

Because of the severity of this issue, creating a plan of action to build diversity into weed management programs is key to preventing further development of herbicide-resistant weeds. For optimal results in soybean fields, consider these approaches:

  • Identify the weed spectrum in each field.
  • Use herbicides with 2 different modes of action that target the same species to help combat resistance and effectively manage weeds.
  • Defend early soybean plants against weed competition by applying a pre-emergence residual herbicide that contains multiple modes of action.
  • Utilize a burndown application like Gramoxone® SL 0 where dense weed populations or scattered, hard-to-control weeds exist to help reduce early-season weed competition.
  • Use herbicides such as Boundary® and Prefix® for continued pre-emergence control. Each consists of 2 leading active ingredients and 2 non-glyphosate modes of action to provide fast and effective weed control.
  • Maximize herbicide diversity by following Boundary with Flexstar® GT 3.5 herbicide applied post-emergence over-the-top for continued weed control in glyphosate-tolerant soybeans.
  • Protect the PPO-inhibiting class of herbicides by using Flexstar GT 3.5 applied post-emergence to weeds 2 to 4 inches tall.

Combining cultural practices, such as crop rotation and tillage, with multiple, effective modes of action helps control weeds, reduce the weed seed bank, maximize diversity and fight herbicide resistance.

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