The Roundup -

Ag Days Presentation Will Address Concerns About Recently Confirmed Marestail In Richland County


A seeding marestail.

On Thur., March 3, at 11 a.m. Richland County Extension Agent Tim Fine and Extension Weed Specialist Fabian Menalled out of Bozeman, MT will be holding an educational session on Glyphosate Resistant Marestail or Horsetail.

Conyza Canadensis, or marestail, was first found in Richland County in the spring and summer of 2015. In a month's time, three producers brought Fine samples of the weed, reporting that they couldn't identify it or control it. Shortly thereafter, it was determined that it was marestail, which is resistant to Glyphosate, the active ingredient in Roundup. In some areas, marestail is also resistant to other types of weed controlling chemicals and has been a particular problem in the 'Corn Belt' which includes Ohio, Indiana, Illinois, and Missouri.

Marestail is an adaptive weed that has been located in the United States and fifteen other countries. There have been reports of it in twenty-two states across the nation, with findings in Richland County making Montana the most recent addition to affected states.

By addressing the issue early on, Fine hopes to stay ahead of the weed before it can become a major problem that could affect all crops. He and Menalled will be discussing potential preventative measures such as tillage and fall herbicide application. This and all other educational sessions held on March 3, will earn attendants continued education points towards their pesticide license for both private and commercial pesticide application.

For more information, contact Fine at 406-433-1206 or email him at


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