Umatilla County

Noxious Weed List

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ODOT Region 5 ODA

Weed Control

Road Department

Most Wanted Weed

Location

Umatilla County Road Department
3920 Westgate Street
Pendleton, Or 97801
Info:541-278-5424
The Road Department is open 6:30 am. to 5 pm. Mon. through Thr. and 8 am. to 5 pm. Fri.

Location and hours for other County offices


Introduction

INTRODUCTION: The Umatilla County Weed Control Board and Board of County Commissioners believes that the prevention and eradication of newly invading weed species yields the greatest return for the resource investment. This is best achieved through an intensive survey and inventory program allowing for early detection and early action. Education and awareness is an integral part of prevention and early detection. Being familiar with what is growing around us is the best way to assure that when a new invader arrives, it will be noticed and dealt with at the most effective stage of development.

ORS.570.505-570.600

Per ORS.570.505-570.600 the following lists is 2003 adopted Umatilla County Noxious Weed Control List. The weeds listed here are those on the 2003 Oregon State Department of Agriculture list CURRENTLY FOUND GROWING OR KNOWN TO HAVE GROWN PREVIOUSLY in Umatilla Co. They are divided according to control requirements categories "A" and "B"

“A” designated weed-a weed of known economic importance which occurs in the state/county in small enough infestations to make eradication/containment possible; or is not known to occur, but its presence in neighboring states/county make future occurrence in Oregon seem imminent.

“B” Designated weed-a weed of known economic importance which is regionally abundant, but which may have limited distribution in some counties. Where implementation of a fully integrated statewide management plan is feasible, biological control shall be the main control approach for species which biological agents are available; noted by asterisk.

"A" Designated Weed List

These Class “A” weeds have been found as single plants or in very limited populations in the county. Prevention, early detection, and eradication is high priority. Cost share may be available at the Weed Board discretion

  • Camelthorn (Alhagi pseudalhagi)
  • Creeping Yellow Cress (Roripa sylvestris)
  • Leafy Spurge (Euphorbia esula)
  • Marijuana (Cannabis sativa)
  • Meadow Knapweed (Centaurea jacea XC. Nigra)
  • Purple Loosestrife (Lythrum salicaria)
  • Purple Starthistle (Centaurea calcitrapa)
  • Rush Skeletonweed (Chondrilla juncea)
  • Spotted Knapweed (Centaurea maculosa)
  • Tansy ragwort (Senecio jacobaea)

RECOMMENDED ACTION: Infestations are subject to intensive control when and where found.

"B" Designated Weed List

RECOMMENDED ACTION: Limited to intensive control at state or county level as determined on a case-by case basis.

  • Viper’s Bugloss (Echium vulgare)
  • Perennial Pepperweed (Lepidium latifolium L.)
  • Austrian Peaweed (Sphaerophysa salsula)
  • Canada Thistle (Circium arvense)
  • Cereal Rye (Secale cereale)
  • Dalmation Toadflax (Linaria dalmatica)
  • Dodder (Cuscuta pentagona)
  • Diffuse Knapweed (Cuscuta pentagona)
  • Hoary Cress (Cardaria draba)
  • Johnsongrass (Sorghum halepense)
  • Jointed Goatgrass (Aegilopscylindrica)
  • Kochia (Kochia scoparia)
  • Musk Thistle (Carduus nutans)
  • Puncturevine (Tribulus terrestris)
  • Quackgrass (Agropyron repens)
  • Ragweed (Ambrosia artemisiifolia)
  • Russian Knapweed (Acroptilion repens)
  • Scotch Thistle (Onopordum acanthium)
  • St. Johswort (Hypericum perforatum)
  • Yellow Starthistle (Centaurea solstitialis)

Enforcement emphasis groups; these groups of invasive plants have been targeted for additional enforcement throughout the County according to the land types and corresponding agricultural uses associated. Three land uses types have been identified and weed lists developed for each they are:

  • Dry Land Annual Cropping Areas: Emphasis Weeds, Canada Thistle, Scotch Thistle, Yellow Starthistle, Goatgrass, and Kochia.
  • Irrigated Crops and Pastures: Emphasis Weeds, Canada Thistle, Scotch Thistle, Bull Thistle, Musk Thistle, Yellow Starthistle, Diffuse Knapweed.
  • Dryland Range/Pasture/Timber: Scotch Thistle, Bull Thistle, Canada Thistle Spotted Knapweed, Diffuse Knapweed, Russian Knapweed.

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