Skip to content

~Click on links below to learn more about Biological Agents~








~ Order Biological Agents here:

If you would like to order biological agents, you can download the application, fill it out, sign it  and return to us by mail, or drop off at our office. Once we have a signed order form we will place your order for you. May-early June is the time to get your Dalmatian toadflax and Diffuse and Spotted knapweed bio-control. We are just a facilitator, we do not bill you, Gary Piper will, once he ships your bugs.


Lincoln County  Noxious Weed Control

P.O. Box 241

Davenport, WA 99122



The Weed Board meets in accordance with RCW 17.10.060 (3) and RCW 42.30 (Open Public Meetings Act). All public is welcome; simply call the Weed Board office if you wish to be on the agenda of any particular meeting. The meeting schedule is below; all meetings are held the 3rd Monday unless it’s a holiday in which case the meeting would be held on the following work day. The Weed Board conference room is located at 405 Ross St., Davenport, WA.

January at 1:00 PM

March at 1:00 PM

June at 1:00 PM

July at 1:00 PM

September at 1:00 PM

October at 1:00 PM

*We have a Board member opening. The application link is below. Please call 509-725-3646 for more information. Applications should be sent to: Lincoln County Noxious Weed Control Board P.O. Box 241 Davenport, WA 99122







ELIGIBILITY TO SERVE. RCW 17.10.050 (1) requires that four of five voting members be engaged in primary production of agricultural products. There is no requirement that agriculture be a primary source of income for these members.

APPOINTMENT TO THE WEED BOARD. Voting members of the weed board are appointed by the Board of Lincoln County Commissioners to serve four-year terms starting on January 1st and ending on December 31st of the respected term.

  • WEED BOARD MEMBER IN GOOD STANDING. A weed board member in good standing shall abide by these RULES AND REGULATIONS and the laws of the State of Washington. RULES OF ORDER. The Sturgis Standard Code of Parliamentary Procedure governs this organization in all parliamentary situations that are not provided for in the law or other portions of these adopted RULES AND REGULATIONS.

RESPONSIBILITIES OF THE WEED BOARD AND ITS MEMBERS. The individual members of the weed board shall represent the people and interests of the district from which each is appointed.  The weed board shall represent Lincoln County and the people and interests of the County as a whole.  As provided in RCW 17.10 the weeds control office:

  • administers the Noxious Weed Control Program by establishing policies and procedures in accordance with statutes and legislative direction.
  • adopt RULES AND REGULATIONS and its annual Noxious Weed List Hearing.
  • conducts enforcement hearings, applies liens on properties, and conducts other public hearings and meetings as necessary during the year.
  • holds a public hearing prior to adoption of land classifications for assessment purposes.
  • proposes an annual budget for operation of the Noxious Weed Control Program according to established County policies.
  • advertises for and accepts applications for appointment to the weed board as required, pursuant to RCW 17.10.050(2), and recommends to the Board of County Commissioners the appointment of the most qualified applicant for each position.


The weed board consists of six members. The five voting members shall reside in and represent one of five county weed districts. The chair of the county extension office shall appoint one nonvoting member. RCW 17.10.050

  • District 1 comprises the southwest section of Lincoln County. It is bound on the north by Township 24 N; on the west by the Grant County lines; on the east by Range 36 E; and on the south by Adams County lines.
  • District 2 comprises the southeast section of Lincoln County. It is bound on the north by Township 24 N; on the west by Range 35 E; on the east by the Spokane County lines; and on the south by the Adams County lines.
  • District 3 comprises the northeast section of Lincoln County. It is bound on the north by the Spokane River; on the west by Range 37 E; on the east by the Spokane County lines; on the south by Township 24 N.
  • District 4 comprises the central section of Lincoln County. It is bound on the north by Lake Roosevelt; on the west by Range 33 E; on the east by Range 37E; on the south by Township 24 N.
  • District 5 comprises the northwest section of Lincoln County. It is bound on the north by Lake Roosevelt; on the west by Grant County lines; on the east by Range 34 E; on the south by Township 24 N.

Bee The ChangePicture9

Your commitment to protecting our environment, economic resources, and recreational lands from noxious weeds does not need to come at the expense of bees, butterflies, and other pollinators. Here, we have compiled information about our non-invasive flower blend as well as pollinator friendly weed control.

Bees are an essential part of our landscapes including farming and urban areas, yet many bee species are on the decline. Lincoln County Noxious Weed Board along with other County Weed Boards across the state are partnering up to inform the public about this matter and how they can get involved. Honeybees provide many benefits to the agricultural industry. Many of our food crops require the use of pollinators. Without pollination we lose the foods we love.

A few of the reasons believed to aid in this decline are:

  • Bee diseases or parasites
  • Pesticides, especially insecticides used in the wrong place at the wrong time
  • Loss of habitat and nutritious forage plants

Invasive species are considered to be beneficial to most bee keepers but they are not beneficial to our environment. They out compete our native plants and are more expensive to control. They take up water resources, reduce yields and some species are toxic to animals and human beings.

Although bees are attracted to some noxious weeds that have bright flowers like Dalmatian Toadflax, Diffuse and Spotted Knapweed, we really would like them to choose a better non-invasive flower. Our goal is to replace noxious weeds with quality non-invasive plants and flowers that bees and other pollinators such as butterflies need.

We can still BEE smart and control our weeds!

  • Avoid applying any pesticides including insecticides and fungicides during bloom when the bees are most attracted to the flowers.
  • When pesticide application cannot be avoided we suggest you use targeted formulations with the least toxic ingredient and follow manufactures directions, apply it directly and locally as possible and apply when bees are not active.
  • Plant desirable species that are attractive to bees.

This year we are offering a FREE pollinator seed packet to jump start your part on helping out the bees! These packets include a variety of beautiful, non-invasive garden plants that are much friendlier to our landscapes! This flower blend is a fantastic way to attract pollinators to gardens and other landscaped areas. Stop by the Weed Board office to get a non-invasive and pollinator friendly flower seed packet, while supplies last.

Seed Packet Contents:

Lupinus succulentus/harwegii (Annual Lupine)

Coreopsis lanceolata (Lance-Leaved Coreopsis)Picture3

Echinacea purpurea (Purple Coneflower)

Helianthus annuus (Dwarf Sunspot Sunflower)

Lupinus perennis (Perennual Lupine)

Gaillardia aristata (Blanketflower)

Chamaecrista fasciculata (Partridge Pea)

Ratibida columnaris (Mexican Hat)

Cosmos bippinatus (Cosmos Sensations Mix)

Phacelia tanacetifolia (Lacy Phacelia)

Coreopsis tinctoria (Plain Coreopsis)

Penstemon strictus (Rockey Mountain Penstemon)

Monarda citridora (Lemon Mint)

Limnanthes douglassi (Poached Egg Meadowfoam)

Trifolium incarnatum (Crimson Clover)

Asclepias tuberosa (Butterfly Milkweed)

Salvia farinacea (Blue Sage)

Monarda fistulosa (Wild Bergamont/Bee Balm)


Little Work…Big Results!

There are some important factors that you need to consider when planting your Bee Feed mix.

You don’t need bare ground to plant the wild flower mix. You do need it to be noxious weed free. These flowers are broadleaf plants and most invasive weeds are broadleaf as well. So spraying them with a broadleaf herbicide will kill both your invasive and the flowers you just planted. You can set up a weed walk with one of our staff and find out what noxious weeds may be on your property.

Once you know where you want to start your pollinator habitat. The next step is to prepare the seed bed. You may see some bare ground or niches between the grasses you already have established. These niches are a great place to start. For small area site prep you can rake the ground and break up the top soil. For a larger area you can use a harrow or disk behind a tractor.

For your benefit we already did the hard work for you. We have beneficial pollinator seed mixes all ready for you to plant. There is no guessing or leg work to find out what the bees like best! These mixes have been carefully selected and will provide bloom from spring to fall with a mix of perennial and annual wildflowers. This means the bees always have a source of nectar.
When seeding you want to make sure you get an even coverage on the ground. This ensures that you will have a better chance of not letting invasive species in your pollinator habitat later on. Only buy noxious weed free seed from reputable seed distributors.

Unless we are experiencing a drought we do not usually need to water the seedbed. If the seeds germinate and there is no rainfall predicted it might be best to do some supplemental irrigation to ensure seedling survival.

After you have established a growing pollinator habitat you will need to do some maintenance on it. Such as, hand pulling weeds that are undesirable and mowing at the end of the growing season to help spread seed.

After a little work you will have a beautiful meadow or area that will be full of colorful non-native flowers and you will be doing your part in helping the bee colonies out in their survival.

To purchase a larger quantity, bee mix is available in various sizes at Rainier Seeds Inc. in Davenport, WA (509) 725-1235

Picture5A custom pollinator blend can also be formulated for you at Landmark Turf and Native Seed, in Airway Heights, WA (800) 268-0180

Click link below to view the 2019 Lincoln County Noxious Weed List


What Are Noxious Weeds?

Noxious weeds are non-native plants introduced to Washington through human actions. Because of their aggressive growth and lack of natural enemies in the state, these species can be highly destructive, competitive or difficult to control. These exotic species can reduce crop yields, destroy native plant and animal habitat, damage recreational opportunities, clog waterways, lower land values and poison humans and livestock.

What Is The State Noxious Weed Law?

Washington’s noxious weed law (RCW 17.10) requires public and private landowners, including city, county, state and federal land agencies, to control and prevent the spread of designated noxious weeds on their property. Control is defined in WAC 16-750 as the prevention of all seed production. Federally owned lands are also subject to the Federal Noxious Weed Act (Public Law 93-629). Since many people are unfamiliar with noxious weeds, the county weed program is available to provide information on identification and control option(s). Landowners can choose the control option(s) they feel is most appropriate for their noxious weed site.

Why Is There A Law To Control Noxious Weeds?

Noxious weeds affect everyone. Weeds do not obey property lines or jurisdictional boundaries. It takes a coordinated effort to prevent new noxious weeds from establishing and to control and eradicate the weeds already here. The noxious weed law provides a tool to quickly and effectively stop the spread of the new and most damaging weeds. Early Detection and Rapid Response is the ultimate goal.

Which Weeds Should Be Controlled?

To help protect the county’s resources, the Lincoln County Noxious Weed Control Board adopts a County Weed List each year (WAC 16-750). This list categorizes weeds into three major classes: A, B and C based on distribution, abundance and level of threat (how dangerous the plant is to humans, animals, private and public lands, and native habitats).

The goal is to prevent the spread of new and recently introduced weeds while it is still cost-effective. Class A weeds are the most limited in distribution and therefore the highest priority for control. Class B and C weeds vary in priority based on local distribution and impacts. Noxious weeds that are widespread in Lincoln County are called non-designated noxious weeds and control of these is also required.

What Is The Role of The Lincoln County Noxious Weed Control Program?

We educate property owners on identification, impacts and control methods for state-listed noxious weeds. It is also our job to locate noxious weed infestations that are not being effectively controlled. To achieve this, the program conducts annual surveys and follow-up checks on existing noxious weed locations.

What Does The County Do When Noxious Weeds Are Found?

Program staff provides the landowner with information on how to identify and control noxious weeds on their property. If requested, we will meet with the owner or property manager to review the weed locations and discuss site-specific noxious weed control plans. We also offer backpack sprayers for rent.

What Will Happen If The Noxious Weeds Are Not Controlled?

We will make several attempts to contact the landowner to achieve control. If there is no control when we return to survey at the specified time, landowners may be issued a Notice of Violation (NOV) giving them 10 days (or 48 hours if weeds are in flower or seed) to control the noxious weeds. If the noxious weeds are not adequately controlled by the end of the NOV time limit, the program is authorized by Washington’s noxious weed law (RCW 17.10) to control the noxious weeds and bill the owner for the cost to control and/or issue a non-traffic Civil Infraction whose penalties are assigned as described in the Schedule of Monetary Penalties (WAC 16-750-020).


Davenport, WA 99122




Wilbur, WA 99185


~Please remember to notify the Weed Board Office in any one of the following ways, your plan for control:

Call: 509.725.3646 leave a voicemail if after hours


Write: P.O. Box 241 Davenport, WA 99122

Fax: 509.725.1332

This list only represents those companies that have met the Weed Board requirements; there may be other sprayers. These sprayers are listed with the understanding that no discrimination is intended and no endorsement by the Lincoln County Noxious Weed Control Board is implied. This list does not constitute a guarantee or warranty of work performance or weed control methods.



~The use of residual herbicides are the best choice for fall treatment~

The cool crisp morning air is a signal to start thinking about your fall spray plan. It is an excellent and highly effective time to control most perennial and biennial weeds. Fall rains and cooler temperatures bring on a flush of re-growth and germinate a whole new batch of weed seedlings, thus providing good conditions for extending the herbicide application season.
For good control, its critical to target weeds at their most vulnerable stage, so its very important to make herbicide applications at the right time of year. The best time to control perennial broadleaf weeds is when they area actively growing in spring, and in the fall when the weeds are storing sugar back into the roots as a reserve for re-growth in the spring. Cooler weather and shorter days in the fall initiate this response. So when its bonfires and football season, start thinking about how you are going to control your noxious weeds.
When herbicides are applied at this time, the chemicals are transported to the roots along with the carbohydrates, killing the entire plant instead of just the parts above the soil surface. This is especially important for hard-to-kill and spreading broadleaf weeds like Canada thistle,
St. johnswort and Rush skeletonweed, which have underground creeping roots called rhizomes or extensive root zones.

If the timing of the application is correct, the plant will take in the herbicide. It will move through the plant, and you will have an effective application. Just like with early spring treatments, these lush young plants are relatively easy to control, which means the lower labeled rate of herbicide will get the job done on most species, which translates to more money in your wallet.

Residual herbicides control through the fall and into the following spring. Herbicides such as Milestone, Telar or Perspective, are slower acting, therefore will get to the roots and control the whole plant, and will provide pre-emergence control of germinating seeds, giving your pastures a head start come spring.

Be sure to spray several feet outside the perimeter of a weed patch, to get the plants that may be there that you can not see yet, or seed banks waiting to germinate. This is where the residual control of Milestone, Telar, or Perspective, especially come into play. An advantage of Milestone is that it can be purchased without a pesticide license, and can be applied to seasonably dry wetlands and up to the waters edge.

Contact herbicides such as, Weedar 64 or Hardball, need to be applied to growing plant leaves in order to work. Over-spray onto the soil surface renders them useless. When applied to growing plant leaves, they are as effective as residual herbicides, except they do not have any residual activity in the soil to help control plants.

As always, be sure to use a surfactant.

Read and follow all directions on labels and use personal protective equipment.

When should fall applications be made?

  • Once fall moisture has stimulated a new flush of seedlings.
  • After a light frost, but before a heavy freeze.
  • The window of application closes after a killing frost.
  • Applications can be made up to late October or early November before soil freezes.

Get to the Roots

Tough to control perennials are more vulnerable in the young stage. As they prepare for dormancy, they transfer nutrients from their leaves to their root systems, helping move fall-applied herbicide deep into the roots for a more complete control. Delaying treatment until after the first frost, but before a hard freeze (visible leaf damage) – will help make the herbicide treatment more effective, keep working through spring, stopping new weed sprouts and giving forage grasses an extra advantage. Fall control helps ensure a speedy recovery and prepares grasses for winter. Plus, fall-treating weeds before they gain a foothold is more cost-effective.




What are Noxious Freshwater Weeds?

Freshwater weeds are plants that are not native to Washington, are generally of limited distribution, and pose a serious threat to our state. Plants considered to be nonnative were not present in Washington prior to European settlement. Because nonnative plants have few controls in their new habitat, they spread rapidly, destroying native plant and animal habitat, damaging recreational opportunities, lowering property values, and clogging waterways. Some noxious weeds can even harm humans and animals. The sap of giant hogweed, a plant that grows in wet areas, can cause severe burns.

Nonnative aquatic plants have been introduced to Washington as ornamental plants (purple loosestrife, giant hogweed), as water garden plants (parrot feather milfoil), and as aquarium plants (Eurasian watermilfoil, Brazilian elodea, fanwort). They escaped into our waterbodies through floods, by people discarding aquarium plants, and by being deliberately planted. Once introduced, these invasive plants rapidly outcompete our native plants, forming single-species stands, and reducing habitat for fish, waterfowl, and aquatic mammals and invertebrates.

Many of these exotic weeds are on Washington’s Weed List and the Washington Department of Agriculture prohibits some of these plants for sale, transport, or transplantation. However, not all introduced plants become problems. Many of our agricultural crops and landscaping plants are nonnative. Most do not grow where they are not planted, and do not become invasive or aggressive.

Washington’s Noxious Weed Control Board classifies noxious weeds based on the stage of invasion of each species. The classification system is designed to prevent small infestations from becoming large infestations, and to contain already established infestations to regions of the state where they occur and prevent their movement to un-infested areas of Washington. All weeds on Washington’s Weed List are nonnative species.

To learn more, click on the links below:








Weed I.D. and Options for Control

Click on links below to learn how to identify and control the following invasive weed species…

(Contact us if you would like a hard-copy)


 Absinth wormwood


Bull thistle

Butterfly bush

Canada thistle

Cereal rye

Common bugloss

Common reed / phragmites

Common mullein

Common tansy

Diffuse knapweed

Dalmatian toadflax

Eurasian watermilfoil

Field bindweed

Hoarycress / whitetop


Japanese knotweed

Jointed goatgrass


Leafy spurge

Musk thistle

Myrtel spurge

Orange hawkweed

Oxeye daisy

Perennial pepperweed

Perrenial sowthisle

Poison hemlock


Purple loosestrife

Rush skeletonweed

Russian knapweed

Scotch broom

Scotch thistle

Spotted knapweed

St. Johnswort

Sulfur cinquefoil

Western water-hemlock

Yellow flag iris

Yellow hawkweed

Yellow starthistle

Yellow toadflax