Glyphosate-Resistant Waterhemp Confirmed in Illinois – What’s Next?

Glyphosate-resistant waterhemp has been officially confirmed resistant to glyphosate herbicides in Illinois.  This population of waterhemp is also resistant to ALS-inhibitors, and it is believed that PPO-resistance is just around the corner. According to experts at the University of Illinois, this scenario leaves soybean growers no options for waterhemp control other than cultivation. You can imagine the implications should this become a widespread epidemic.

Looking back, an article published in the University of Illinois’ Integrated Pest Management Bulletin in April 2006 warns about the threat of glyphosate-resistant waterhemp in Illinois.  The article discusses the threat posed by its possible development, arguing that there is a good chance it will happen.  The question is asked, “Will these ‘new’ cases of glyphosate-resistant weeds be sufficient to persuade changes to weed management programs in Illinois, especially in soybean production?” 

Do you think this is a sign of a potentially serious problem for Illinois growers? What are the implications for waterhemp resistant to two, maybe three, modes of action? What was the catalyst that jump-started your resistance management plan?