Life is a learning experience, and farmers, agronomists and researchers spend this time of year looking back on the previous growing season and use what was learned toward the next season’s plans.

The recent “Know More Grow More” blog by Syngenta addressed what happened in the weed control arena during 2018 and what should be considered going into next year. Here are some points of interest:

  • Palmer amaranth continued to move through the Midwest. The invasive weed is native to the arid southwestern United States and northwestern Mexico and its life cycle is adapted to desert conditions. The weed was reported in 2018 in new counties in Minnesota and found in North Dakota for the first time.
  • Waterhemp with six-way herbicide sites of action 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 was confirmed in Tennessee.

Tom C. Doran can be reached at 815-780-7894 or tdoran@agrinews-pubs.com. Follow him on Twitter at: @AgNews_Doran.

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