- Our project goal is to protect and restore rare Willamette Valley upland prairie habitat
at Butterfly Meadows (Benton County) from invasion by the noxious weed
Brachypodium sylvaticum (false brome).
Native prairies, which once dominated the landscape of the Willamette Valley, are
considered among the rarest of Oregon’s ecosystems and are in critical need of
conservation. One of the largest remaining parcels of native upland prairie, Butterfly
Meadows (Benton County), is being invaded by Brachypodium sylvaticum. This site is
one of the three most important remaining habitats for the Fender’s blue butterfly and
Kincaid’s lupine, listed as Endangered and Threatened respectively.
We propose to develop and implement herbicide treatments that control
Brachypodium sylvaticum without harming native prairie vegetation. We will also
develop and implement measures to reestablish native species from seed after removal of
Brachypodium sylvaticum. Conifers and mature shrubs that have encroached on the
meadow, both on the edge and in the complex, will be removed by mechanical means or
We propose to construct a buffer zone between the boundary of Butterfly Meadows
and the neighboring intact forest and recently clear-cut areas, which are continuing
sources of seed of Brachypodium sylvaticum invading Butterfly Meadows. This buffer
zone will extend into both Starker Forest owned portions and OSU owned portions.
To determine the success of control of Brachypodium sylvaticum and woody species
and restoration of native vegetation, we will monitor changes in abundance of
Brachypodium sylvaticum, woody species, and native vegetation. We will use
monitoring results to adjust future Brachypodium sylvaticum control measures and native
vegetation restoration measures as needed.
- Prepared for Oregon State Weed Board; Oregon Department of Agriculture Salem, OR