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

Plant Pest Risk Assessment African Rue

African Rue Plant Pest Risk Assessment

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

Alyssum Plant Pest Risk Assessment

Plant Pest Risk Assessment Alyssum

Barbed goatgrass Plant Pest Risk Assessment

Plant Pest Risk Assessment Barbed goatgrass

Butterfly Bush Noxious Weed - Plant Pest Risk Assessment

Butterfly bush plant pest risk assessment

Camelthorn Plant Pest Risk Assessment

Plant Pest Risk Assessment Camelthorn

Coltsfoot Plant Pest Risk Assessment

Plant Pest Risk Assessment Coltsfoot

Common cordgrass Plant Pest Risk Assessment

Plant Pest Risk Assessment Common cordgrass

Common Reed Plant Pest Risk Assessment

Plant Pest Risk Assessment Phragmities

European Water Chestnut Plant Pest Risk Assessment

Plant Pest Risk Assessment Euro Water Chestnut

False Brome Plant Pest Risk Assessment

False brome plant pest risk assessment

Flowering Rush Plant Pest Risk Assessment

Plant Pest Risk Assessment Flowering Rush

Garlic Mustard noxious weed risk assessment

Garlic mustard risk assessment

Giant Hogweed Plant Pest Risk Assessment

Plant Pest Risk Assessment Giant Hogweed

Goats Rue Plant Pest Risk Assessment

Goats Rue Plant Pest Risk Assessment

Indigo Bush Plant Pest Risk Assessment

Plant Pest Risk Assessment Indigo Bush

Kudzu Plant Pest Risk Assessment

Plant Pest Risk Assessment Kudzu

Meadow, King Devil, Yellow Hawkweed Plant Pest Risk Assessment

Plant Pest Risk Assessment Meadowhawk Complex

Mouse-ear Hawkweed Plant Pest Risk Assessment

Plant Pest Risk Assessment Mousehawk

Oblong Spurge Plant Pest Risk Assessment

Plant Pest Risk Assessment Oblong Spurge

Orange Hawkweed Plant Pest Risk Assessment

Plant Pest Risk Assessment Orange Hawkweed

Paterson Curse Plant Pest Risk Assessment

Plant Pest Risk Assessment Paterson Curse

Purple Nutsedge Plant Pest Risk Assessment

Plant Pest Risk Assessment Purple Nutsedge

Silverleaf Nightshade Plant Pest Risk Assessment

Plant Pest Risk Assessment Silverleaf Nightshade

Spanish Heath Plant Pest Risk Assessment

Plant Pest Risk Assessment Spanish Heath

Spartina Plant Pest Risk Assessment

Plant Pest Risk Assessment Spartina

Squarrose knapweed Plant Pest Risk Assessment

Plant Pest Risk Assessment Squarrose knapweed

Taurian Thistle Plant Pest Risk Assessment

Plant Pest Risk Assessment Taurian Thistle

Tree of Heaven Plant Pest Risk Assessment

Plant Pest Risk Assessment Tree of Heaven

White Bryonia Plant Pest Risk Assessment

Plant Pest Risk Assessment White Bryonia

Wooly Distaff Thistle, Smooth Distaff Thistle Plant Pest Risk Assessment

Plant Pest Risk Assessment Wooly & Smooth Distaff Thistle

Yellow floating heart Plant Pest Risk Assessment

Plant Pest Risk Assessment Yellow floating heart