Oregon

Oregon Department of Agriculture Noxious Weed Control:

http://www.oregon.gov/oda/programs/weeds/pages/aboutweeds.aspx

Pacific Northwest Weed Management Handbook: https://pnwhandbooks.org/weed

Oregon State University Weed Science: http://horticulture.oregonstate.edu/group/weed-science

Mapping tool for herbicide resistant weeds in Oregon:

The Oregon Department of Agriculture has an online tool for reporting the locations of state-listed noxious weeds, and for viewing where in the state these weeds have been reported. Find out if a problem weed is in your area: Weed Distribution in Weed Mapper

Herbicide resistant weeds in Oregon

Updated November, 2016. Source: Ian Heap, www.weedscience.org – Oregon

Reading this list: Each weed with herbicide resistant populations in this state is listed. Underneath each species is a list of the unique resistant biotypes of that weed in the state, according to the herbicide group(s) they are resistant to.

Italian ryegrass

  • Group 1
  • Group 9
  • Group 9 + 10

Wild oat

  • Group 1
  • Group 3

Russian thistle

  • Group 2
  • Group 9

Prickly lettuce

  • Group 2

Kochia

  • Group 2
  • Group 9

Redroot pigweed

  • Group 5

Annual bluegrass

  • Group 5
  • Group 7
  • Group 16

Common groundsel

  • Group 6

Downy brome (cheatgrass)

  • Group 1
  • Group 2

Smallseed flaxfalse

  • Group 2

Shepherd’s-purse

  • Group 5