Douglas County Weed Management

Projects and Programs

Project Sign

PROJECT DISPLAY SIGNS

Washington State University Douglas County Extension, Douglas County and Foster Creek Conservation District purchased three Noxious Weed Control signs to post at three beneficial insect release sites along Highways 17, 172 and 174. 


Jameson Lake

JAMESON LAKE RECEIVES WEED EATING BEETLES

Purple loosestrife is a non-native aquatic weed that was introduced into Washington in the late 1800's. Although is has attractive purple flowers, this invasive plant can choke out native vegetation and can become a fire hazard. Dale Whaley, WSU Douglas County Agriculture & Integrated Weed Management Educator released tiny leaf eating beetle, Galerucella to feed on the young shoots and stems of Purple loosestrife in the James Lake area to control the invasive weed. 


East Wenatchee Landfill

HIGH SCHOOL STUDENTS LEARN ABOUT NOXIOUS WEEDS

Eastmont High School Advanced Science class learned about noxious weeds and how they can adversely affect the environment. WSU Extension educators took students to the Greater Wenatchee Landfill to look at and identify noxious weed problems and how they could be solved. .Two noxious weed sites were identified and biological control agents were release and will be monitored to control the spread of noxious weeds at the landfill.


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KNAPWEED AND TOADFLAX BIOLOGICAL CONTROL 

The Knapweed seed head weevil Larinus minutus and the stem-mining weevil, Mecinus janthinus, are two highly effective biological control agents when it comes to suppressing Diffuse knapweed and Dalmatian toadflax. These two biological agents are unequivocally the most destructive of all the insects released against knapweed and toadflax in North America thus far. The insects are host specific which means they will only attack knapweed and toadflax, they are self perpetuating, have the ability to fly and find weeds nearby in an area and are ecologically desirable and cost effective. They readily survive in most sites where released and will start impacting the two weed species immediately. The goal of any biological control program is to shift the competitive balance away from he target weed to desirable grasses and forbs.

WSU Douglas County Extension has been working with Douglas County, FSA and Foster Creek Conservation District to identify and release these beneficial insects in infested area. If you think you have an area that could benefit from the release of biological control please contact Dale Whaley, WSU Extension Educator at 509-745-8531.