Union County Weed List 2017


UNION COUNTY


Weed Control




Brian Clapp
Weed Supervisor
bclapp@union-county.org



Union County wants to help YOU control your noxious weeds!


Thanks to the Weed Levy passed last year, the Union County Weed Control Department is now able to offer up to a $500 reimbursement for treating noxious weeds on your property. This is a 50/50 Cost Share program for qualified applicants, and applies to many different integrated weed management strategies. Weeds required to be controlled in Union County are listed below. Please call us at 541-805-5399, email bclapp@union-county.org , or go to our website www.unioncountyweedcontrol.org for a cost share application and more info.

State of Oregon Laws & Regulations on Noxious Weeds

Oregon Revised Statutes, Chapter 569 — Weed Control (excerpts)

  569.180 Noxious weeds as public nuisance; policy. In recognition of the imminent and continuous threat to natural resources…noxious weeds are declared to be a public nuisance and shall be detected, controlled and, where feasible, eradicated on all lands in this state.      

What is a noxious weed?

A weed is designated noxious when it is considered by a governmental agency to be injurious to public health, agriculture, recreation, wildlife, or property (Oregon Administrative Law 603-052-1200). Most noxious weeds are non-native plants that are serious pests causing economic loss and harm the environment. Noxious weeds choke out crops, destroy range and pasture lands, clog waterways, affect human and animal health, and threaten native plant communities.

Designation of Noxious Weeds in Union County

CLASS “A” WEEDS Class “A” designated weed is a priority noxious weed designated by the Union County Commissioners as a target weed species on which the Weed Control District will comply with a state wide management plan and/or implement a county wide plan for intensive control and monitoring.  An “A” rated weed may also be a weed of known economic importance which occurs in small enough infestations to make containment/eradication possible; or one that is not known to occur here, but its presence in neighboring counties make future occurrence here seem imminent.


  • Russian knapweed
  • Common bugloss
  • Rush skeletonweed
  • Scotch broom
  • Leafy spurge (greater than 1 mile from the Grande Ronde River)
  • King-devil hawkweed
  • Meadow hawkweed
  • Giant knotweed
  • Japanese knotweed
  • Himalayan knotweed
  • Hybrid or Bohemian knotweed
  • Tansy ragwort
  • Common crupina
  • Meadow knapweed
  • Yellow starthistle (outside the Cove area)
  • Mouse-ear hawkweed
  • Orange hawkweed
  • Yellow hawkweed
  • Hoary cress -- Whitetop (within the Grande Ronde basin)
  • Perennial pepperweed
  • Mediterranean sage
  • Yellow toadflax
  • Myrtle spurge
  • Velvet leaf
  • Black henbane
  • Common tansy
CLASS “B” WEEDS Class “B” designated weed is a weed of economic importance, which is both locally abundant and abundant in neighboring counties.
  • Jointed goatgrass
  • Spotted knapweed
  • Diffuse knapweed
  • Yellow starthistle (Cove area)
  • Oxeye daisy
  • Canada thistle
  • Wild carrot – Queen Anne’s Lace
  • Leafy spurge (within 1 mile of Grande Ronde River)
  • Hoary cress -- Whitetop (within Powder River basin)
  • Dalmatian toadflax
  • Purple loosestrife
  • Scotch thistle
  • Sulfur cinquefoil
  • Puncturevine
  • Houndstongue
  • Armenian (Himalayan) blackberry
  • Yellow flag iris
  • Medusahead rye
  • Ventena grass-- North Africa grass, Wiregrass
  • Saltcedar

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