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Weeds and WeedMapper

Early detection and rapid response (EDRR) are primary activities of the Oregon Department of Agriculture (ODA) Noxious Weed Control Program. Weeds are listed and targeted for early detection and rapid response activities.

Program goals:

  • Prevent introduction
  • Prevent widespread occurrence through
    • Early detection efforts
    • Implementation of control measures

ODA works toward prevention through the noxious weed quarantine and EDRR projects. Program staff use a weed risk assessment process with the Oregon State Weed Board (OSWB) to list species on the State Noxious Weed List. Priority listed species, "A" (highest priority) and "T" (target) designated weeds of limited distribution in the state, are the primary EDRR targets for ODA.

  • Priority species are incorporated into presentation and outreach activities to increase awareness.
  • Pest alerts and educational materials are distributed in an effort to find new infestations.
  • Survey for early detection is conducted.
  • Rapid response projects are implemented for eradication or containment.
  • Statewide management plans for “T” weeds are updated annually to identify priorities.

ODA works with state and federal cooperators, county weed programs, county weed management areas (CWMAs), and private landowners to implement EDRR projects or provide assistance through OSWB grants.

Benefits of EDRR

  • 34:1 benefit to cost ratio for EDRR projects.
  • Annual treatments for the control of “A” and “T” designated weeds reduce the net acreage of many large infestations of weeds.
    For example:
    • Distaff thistle, Carthamus lanatus, 99% control
    • Purple starthistle, Centaurea calcitrapa, 99% control
    • Increased weed awareness among the general public


Western US Invasive Plant EDRR Guide

Provided as a resource to Oregonians to aid in Early Detection and Rapid Response for invasive weeds in Oregon.​​ Western US Invasive Plant EDRR Guide