CAMP SHERMAN, OR -- The Deschutes National Forest will attack invasive weeds near the Metolious River  starting tomorrow. The agency says it will use Roundup Custom and Polaris herbicides to kill ribbongrass, reed canarygrass, peavine and yellow flag. Treatments will be made just upstream from the South Fork Lake Creek downstream to Candle Creek Campground. The herbicides will be applied by spot applications using backpacks or hand sprayers. The work should be completed Thursday.