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Learn From the Past: Conquer Resistant Weeds in 2019

November 16, 2018
This agronomic image shows palmer amaranth in soybean fields.

Palmer amaranth spread to new areas in the Midwest in 2018.

Now that harvest has wrapped up, it’s time to take a look back on the season as you make input decisions for next year. In 2018, tough-to-control weeds built resistance to more sites of action (SOAs) and spread to new counties and states.

Here’s what you should consider going into 2019:

  • Palmer amaranth continued to move through the Midwest. The weed was reported in new counties in Minnesota and made its way into North Dakota for the first time.
  • Waterhemp with 6-way resistance was confirmed in Missouri.
  • Michigan State University researchers confirmed the first worldwide report of resistance to a Group 4 herbicide in common ragweed.
  • University of Nebraska researchers showed the negative yield impact of herbicide-resistant waterhemp competing with soybeans and stunting growth, especially early in the season.
  • Glyphosate-resistant barnyardgrass has been confirmed in Tennessee.

An effective management plan requires an integrated approach that combines traditional cultural practices, like tillage and cover crops, with a herbicide program that contains multiple effective SOAs. This combination of strategies can significantly extend the life of current herbicides and delay the spread of resistance for years to come.

As you make herbicide decisions for 2019, remember the importance of establishing a full-season herbicide program that will keep your fields clean next year and into the future. Our Resistance Fighter® program provides local recommendations for efficiently managing weeds and weed resistance in your area.

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