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Northern Illinois Agriculture

University of Illinois Extension

North Central Weed Science Society

I have finished day two in St. Louis at the North Central Weed Science Society meeting. It is the first NCWSS program I have attended and I find and the format very interesting. Beyond the opening general session the entirety of the conference consists of 15 minute presentations by graduate students, academics, and industry folks. What have I learned so far? Herbicide resistant weed populations are going to be a BIG deal! We have been fortunate in northern Illinois to date; but it is unrealistic to think that it will not happen here. It is a matter of time before we will likely become much more vested in the issue.

In no specific ranking or combination the following weeds with resistance and states or provinces were mentioned

  • Common ragweed
  • Kochia
  • Giant ragweed
  • Horseweed (Marestail)
  • Giant Ragweed
  • Palmer amaranth
  • Common waterhemp

One or more of these species were reported in Nebraska, Kansas, Illinois, North Dakota, Ohio, Missouri, Kentucky and Ontario. Some of the field populations of the weeds withstood 6-8x application rates of herbicides.

Coming to a field near you soon, the need for integrated weed management!

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