USFS plans to spray herbicides on invasive plants near Metolius River, Trail
SISTERS, Ore. (KTVZ) -- Depending on weather conditions, the Deschutes National Forest will apply herbicides to invasive plants within an area adjacent to the Metolius River and the Metolius River Trail in late September, officials said Thursday.
The treatments will occur between Sept. 27 and Sept. 30 along the Metolius River Trail (trail 4020 on the west side and trail 4018 east side).
The Sisters Ranger District will use two herbicides (Roundup Custom® and Polaris®) to treat invasive non-native ribbongrass, reed canarygrass, perennial peavine and yellow flag iris on about an acre along the Metolius River.
In locations over 15 feet from water, Transline® may be used on perennial peavine.
Treatments will take place in select locations from upstream of the confluence with South Fork Lake Creek downstream to Candle Creek Campground.
The method of treatment will be spot applications with a backpack or hand sprayer by certified herbicide applicators. It involves application of herbicide to foliage of target invasive plants to minimize effects to native plants.
The applied herbicides typically dry within an hour of being applied and do not pose a risk to human, wildlife, or animal health under the concentrations being applied.
The Metolius River Trail on both sides of the river will remain open during treatment, but the public should remain on the trails and are encouraged to keep dogs leashed during active treatments.
Ribbongrass, reed canarygrass, perennial peavine and yellow flag iris are aggressive invasive plants overtaking native sedges, wildflowers, and shrubs within the river’s riparian habitats. These invasive plants out-compete most native species and present a major challenge to protecting unique native vegetation and habitat of the Metolius River.
Restoring and protecting the Metolius Wild and Scenic River and its values including fish, wildlife, water quality, ecology, scenery, and cultural values is a priority of the Deschutes National Forest. This action, in addition to others, will move that restoration effort forward.
The two herbicides being used were approved through an environmental analysis in 2005 and a supplemental environmental analysis in 2012. Past treatments have been highly successful, and the population appears to be reduced by about 75% with each treatment.
For more information, please contact Elizabeth Johnson, Sisters District Botanist at 541-549-7727.
