Stevens County WA Noxious Weed List page

Stevens County 2008 Noxious Weed List
Approved on February 26, 2008 pursuant to RCW 17.10.090-17.10.100

INTRODUCTION: The Stevens County Noxious Weed Control Board believes that the prevention and eradication of newly invading noxious 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 are 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.

Following a public hearing held on February 26, 2008, the Stevens County Noxious Weed Control Board of Directors voted to adopt all Class A, all Class B Designate and certain Class B noxious weeds from the 2008 WA State Noxious Weed List. Even though we include all A and B-designate weeds on our County list, only those that are CURRENTLY FOUND GROWING OR ARE KNOWN TO HAVE GROWN PREVIOUSLY (reported sightings within the past five years) in Stevens Co. are listed here. They are divided according to control requirements:

Section 1)
These CLASS A weeds have been found as single plants or in very limited populations. Prevention, early detection and eradication is high priority. Cost share may be available at Board discretion.

buffalobur Solanum rostratum	bighead knapweed Centaurea macrocephala		clary sage Salvia sclarea
meadow clary Salvia pratensis		velvetleaf Abutilon theophrast

Section 2)
These Class B Designate weeds are located in portions of the county in very limited or moderate populations. Preventing seed production, preventing further spread, reducing existing population sizes, inventory and education are the priorities. Cost share may be available at Board discretion.

annual bugloss Anchusa arvensis	black henbane Hyocyamus niger	blueweed (vipers bugloss) Echium vulgare	garden loosestrife Lysimachia vulgaris
kochia Kochia scoparia	leafy spurge Euphorbia esula cost share '08	longspine sandbur Cenchrus longispinus cost share '08	musk thistle Carduus nutans
perennial pepperweed Lepidium latifolium cost share '08	perennial sowthistle Sonchus arvensis	puncturevine Tribulus terrestris cost share '08	purple loosestrife Lythrum salicaria
Russian knapweed Acroptilon repens	saltcedar Tamarix ramosissima	Scotch broom Cytisus scoparius cost share '08	Scotch thistle Onopordum acanthium cost share '08
tansy ragwort Senecio jacobaea cost share '08		wild chervil Anthriscus sylvestris

Section 3)
NOTE the special control requirements for the below listed weeds differs dependent upon where in the county they are. Read Carefully. These weeds are on the State list as Class B Designate in some areas of the county and Class B in others. This is due to the heavy infestations that occur in relatively condensed regions of the county while they occur only in light or moderate infestations elsewhere. To help prevent further spread of these weeds, the Board has elevated the control requirements in the areas where these 3 weeds are not listed as designates by the State to include: a buffer strip of at least forty (40) feet in width must be maintained along boundaries with adjoining landowners and along travel corridors throughout the county.

plumeless thistle Carduus acanthoides
-considered Class B Designate, with the same requirements outlined in section (2) above, south of Highway 20 from Pend Oreille Co to Ferry Co (also known as Highway 395 between Colville and Lake Roosevelt). North of the highway, the buffer strip as described above applies.

rush skeletonweed Chondrilla juncea
-considered Class B Designate, with the same requirements outlined in section (2) above, in all areas north of Township 30 North. South of Township 30 North, the buffer strip as described above applies.

yellow starthistle Centaurea solstitialis cost share '08
-considered Class B Designate, with the same requirements outlined in section (2) above, in all areas outside the approximately 14 square mile area known as "Gold Hill" near Kettle Falls (exact boundary description is in
WAC 16-750). Within the "Gold Hill Area", the buffer strip as described above applies.

Section 4)
This weed is listed as Class B Designate in most of the county but it is a Class B in a specific section. This is due to the relatively heavy infestation that occurs in a small area. Because it is an aquatic weed, the buffer strip as described above does not apply.

yellow floating heart Nymphoides peltata
-considered class B Designate, with the same requirements outlined in section (2) above, everywhere EXCEPT the Spokane River between Long Lake Dam and Nine Mile Dam where it is a Class B weed.

Section 5)
These weeds are normally grown as ornamentals. If they are found to have escaped intentional landscape planting and appear to be spreading in the "wild" control may be required.

butterfly bush Buddleja davidii	myrtle spurge Euphorbia myrsinites
yellow archangel Lamiastrum galeobdolon

Section 6)
These Class B weeds exist in moderate to heavy populations in much of the county. To help prevent further spread of these weeds, a buffer strip of at least forty (40) feet in width must be maintained along boundaries with adjoining landowners and along travel corridors. Beyond this buffer zone, the focus will be on assisting landowners one-on-one with control recommendations and technical assistance when requested and utilizing biological control techniques when available. Understand, these weeds are recognized as being extremely detrimental, but due to the widespread infestations, we feel voluntary management is generally the wisest utilization of the Weed Board’s and the landowner’s limited resources.

common bugloss Anchusa officinalis	diffuse knapweed Centaurea diffusa
spotted knapweed Centaurea biebersteinii

Section 7)
Additionally, at the discretion of the Wed Board, any site infested with state listed noxious weeds, whether within an area where the weeds are normally required to be controlled or not, that poses a threat of the spread of propagules (seeds, roots, vegetative parts) through the transport of contaminated materials, may require control and may be subject to enforcement by the Board. These sites include but are not limited to gravel pits, quarries, landscape materials, etc.

Click here (MSdoc) OR HERE (PDF) for an easily printable version of the Stevens Co 2007 Weed List

You can view and print a brochure of all 138 weeds on the State Noxious Weed list by accessing the State Weed List 2008 (MSdoc) here. OR State Weed List 2008 (PDF) here.

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DEFINITIONS
of some of the legal terms mentioned above can be found in our glossary

EXPLANATION OF LISTING PROCESS

EACH COUNTY WEED BOARD MUST adopt all State classified A and B-designate weeds on their County Weed Lists. However, counties may choose which of the State classified B and C weeds will be placed on their County Weed List dependent upon the individual concerns of each county. Additionally, a County Weed Board may elevate the classification and corresponding control requirements of any weed on the State Weed List.

NOT INCLUDING A NOXIOUS WEED ON our County Weed List does not mean that it has no significant impact or that it is not found in the county. In order to use resources (time, equipment, dollars) in the most effective and efficient manner possible, the SCNWCB has chosen to limit the number of State classified B and C weeds on our county list. Unfortunately, several of the noxious weeds on the State Weed list are already established well beyond the point where we feel a significant impact can be made towards reducing the population of the weed without a substantial allocation of resources going toward that one weed.

IN THE CASE OF WEEDS that are well established, wide spread and/or not included on our list, we feel a strong education/awareness program with an emphasis on voluntary landowner compliance is the best use of resources. Biological control agents (usually insects) can be one of the best management tools for weeds in this category. Many bioagents are already established in the county and the impact they are having on weeds such as diffuse and spotted knapweed, Canada, plumeless and musk thistle, rush skeletonweed and St. Johnswort is visible. The redistribution of bioagents within the county and the continued build up of successful agents or introduction of new agents, when available, will be encouraged and supported by the weed board. Support by the weed board may include using staff or volunteer labor, purchasing or otherwise making available appropriate equipment, sponsoring training opportunities and buying the biocontrols or sharing the cost with landowners as approved by the Board.

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