When discussing invasive weeds, there are a number of terms that are used to describe a particular

WeedWise Classification

Priority:  These weeds are the highest priority that are actively being targeted for eradication by the WeedWise Program.
Targeted: These weeds are rare within the county and are actively controlled by the WeedWise Program when found.
Maintenance:  These weeds are damaging and widespread.  The WeedWise Program encourages control by landowners and can assist with development of a plan to control these weeds.

Oregon Noxious Weed Policy and Classification System:

A – a weed of known economic importance which occurs in the state in small enough infestations to make eradication or containment possible; or is not known to occur, but its presence in neighboring states make future occurrence in Oregon seem imminent.  Recommended action: Infestations are subject to eradication or intensive control when and where found.
B – a weed of economic importance which is regionally abundant, but which may have limited distribution in some counties. Recommended action: Limited to intensive control at the state, county or regional level as determined on a site specific, case-by-case basis. Where implementation of a fully integrated statewide management plan is not feasible, biological control (when available) shall be the primary control method.
T – a priority noxious weed designated by the Oregon State Weed Board as a target for which the ODA will develop and implement a statewide management plan. “T” designated noxious weeds are species selected from either the “A” or “B” list[/quote]

Four County Cooperative Weed Management Area Weed Classification

A = red alert, most invasive, still controllable on a regional or local scale or limited spread
B = most invasive, locally abundant
C = most invasive, widespread
D = less aggressive, wildland invaders, less impact on natural systems
E = aggressive primarily in horticultural/agricultural situations;  note: this category is incomplete
F= needs more info, should be noted if and where it’s a problem
W= watch list

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