Oregon Noxious Weeds

The Oregon Department of Agriculture (ODA) uses a written risk assessment process to identify and rate weed species that pose the biggest threat to Oregon’s agricultural and natural resources. The risk assessment consists of a series of questions that help evaluate the following:

  • Current geographic distribution
  • Plant biology
  • Resource impacts
  • Difficulty of detection and control

Risk assessments are scored using the best available information, observations, and literature reviews. Risk assessment scores help guide the Oregon State Weed Board in their actions to prioritize ODA program projects and in the weed listing process.​

Resources

African Rue Plant Pest Risk Assessment

African Rue Plant Pest Risk Assessment African Rue Plant Pest Risk Assessment

Butterfly Bush Noxious Weed - Plant Pest Risk Assessment

Butterfly bush plant pest risk assessment

False Brome Plant Pest Risk Assessment

False brome plant pest risk assessment

Garlic Mustard noxious weed risk assessment

Garlic mustard risk assessment

Goats Rue Plant Pest Risk Assessment

Goats Rue Plant Pest Risk Assessment

Plant Pest Risk Assessment Kudzu (2013)

Plant Pest Risk Assessment Kudzu

Plant Pest Risk Assessment African Rue (2013)

Plant Pest Risk Assessment African Rue

Plant Pest Risk Assessment Alyssum (2008)

Plant Pest Risk Assessment Alyssum

Plant Pest Risk Assessment Barbed goatgrass (2010)

Plant Pest Risk Assessment Barbed goatgrass

Plant Pest Risk Assessment Camelthorn, Alhagi maurorum (2011)

Plant Pest Risk Assessment Camelthorn

Plant Pest Risk Assessment Coltsfoot (2013)

Plant Pest Risk Assessment Coltsfoot

Plant Pest Risk Assessment Common cordgrass (2011)

Plant Pest Risk Assessment Common cordgrass

Plant Pest Risk Assessment Euro Water Chestnut (2013)

Plant Pest Risk Assessment Euro Water Chestnut

Plant Pest Risk Assessment Flowering Rush (2013)

Plant Pest Risk Assessment Flowering Rush

Plant Pest Risk Assessment Giant Hogweed (2013)

Plant Pest Risk Assessment Giant Hogweed

Plant Pest Risk Assessment Goatsrue (2013)

Plant Pest Risk Assessment Goatsrue

Plant Pest Risk Assessment Indigo Bush (2010)

Plant Pest Risk Assessment Indigo Bush

Plant Pest Risk Assessment Meadowhawk Complex (2013)

Plant Pest Risk Assessment Meadowhawk Complex

Plant Pest Risk Assessment Mousehawk (2013)

Plant Pest Risk Assessment Mousehawk

Plant Pest Risk Assessment Oblong Spurge (2013)

Plant Pest Risk Assessment Oblong Spurge

Plant Pest Risk Assessment Orange Hawkweed

Plant Pest Risk Assessment Orange Hawkweed

Plant Pest Risk Assessment Paterson Curse (2013)

Plant Pest Risk Assessment Paterson Curse

Plant Pest Risk Assessment Phragmities (2013)

Plant Pest Risk Assessment Phragmities

Plant Pest Risk Assessment Purple Nutsedge (2013)

Plant Pest Risk Assessment Purple Nutsedge

Plant Pest Risk Assessment Silverleaf Nightshade (2011)

Plant Pest Risk Assessment Silverleaf Nightshade

Plant Pest Risk Assessment Spanish Heath (2013)

Plant Pest Risk Assessment Spanish Heath

Plant Pest Risk Assessment Spartina (2013)

Plant Pest Risk Assessment Spartina

Plant Pest Risk Assessment Squarrose knapweed (2010)

Plant Pest Risk Assessment Squarrose knapweed

Plant Pest Risk Assessment Taurian Thistle (2008)

Plant Pest Risk Assessment Taurian Thistle

Plant Pest Risk Assessment Tree of Heaven (2013)

Plant Pest Risk Assessment Tree of Heaven

Plant Pest Risk Assessment White Bryonia (2008)

Plant Pest Risk Assessment White Bryonia

Plant Pest Risk Assessment Wooly Distaff Thistle, Smooth Distaff Thistle (2010)

Plant Pest Risk Assessment Wooly & Smooth Distaff Thistle

Plant Pest Risk Assessment Yellow floating heart (2011)

Plant Pest Risk Assessment Yellow floating heart

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