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Weed Management

Program Contact: Rachel Wieme, Extension Agronomist
(509) 524-2685 •

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Photo by Patrick J. Alexander @ USDA-NRCS PLANTS Database

To learn more about noxious weeds and noxious weed control in Walla Walla County or Washington State, please contact:

Walla Walla Noxious Weed Control Board
328  W.  Poplar Street
Walla Walla,  WA  99362
(509) 524-2688

Washington State Noxious Weed Control Board
P.O. Box 42560
Olympia, WA 98504-2560
(360) 725-5764

Washington State Department of Agriculture
21 North First Avenue #103
Yakima, WA 98902
(509) 225-2604

Noxious Weeds are non-native plants introduced to Washington State that can be highly destructive, competitive, and difficult to control. These plants invade our croplands, rangelands, forests, parks, rivers, lakes, wetlands, and estuaries, causing both ecological and economical damage that affects us all as they:

  • lower crop yields
  • reduce forage quality
  • destroy plant and animal habitat
  • displace native plants
  • reduce recreational opportunities (e.g., fishing, hunting, swimming, and hiking)
  • clog waterways
  • decrease land values
  • increase erosion and wildfire risk
  • and some are toxic to humans and livestock.

To help protect the State’s resources and economy, the Washington State Legislature adopts a State Noxious Weed List each year (WAC 16-750). This list classifies weeds into three major classes – A, B, and C – based on the stage of invasion of each species and the seriousness of the threat they pose to Washington State. This classification system is designed to:

  • prevent small infestations from expanding by eradicating them when they are first detected.
  • restrict already established weed populations to regions of the state where they occur and prevent their movement to uninfested areas.
  • allow flexibility of weed control at the local level for weeds that are already widespread.