Montana

Herbicide resistant weeds in Montana

Updated December 9, 2016. Source: Prashant Jha, Montana State University; www.weedscience.org – Montana

Reading this list: Under each species is a list of the unique resistant populations in the state, according to the herbicide group they are resistant to.

Kochia – Highest concern are Group 4 & Group 9 resistance in cereal production

  • Group 2
  • Group 4
  • Group 5
  • Group 9
  • Group 2 + 9

Wild oat – Highest concern are Group 1 & Group 2 resistance in cereal production

  • Group 1
  • Group 2
  • Group 8

Russian-thistle

  • Group 2
  • Group 9

Persian darnel

  • Group 1

Green foxtail

  • Group 1

Horseweed

  • Group 9