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Posts tagged: invasive species

Volunteers Clear Weeds to Benefit Rocky Mountain Elk Habitat, Celebrate 50th Year of the Wilderness Act

Volunteers armed with shovels and picks remove clusters of houndstongue from a high elevation meadow in the Raggeds Wilderness on the Gunnison and White River National Forests. (U.S. Forest Service/Dan Gray)

Volunteers armed with shovels and picks remove clusters of houndstongue from a high elevation meadow in the Raggeds Wilderness on the Gunnison and White River National Forests. (U.S. Forest Service/Dan Gray)

The Raggeds Wilderness, a nearly 65,000-acre area on the Gunnison and White River National Forests near Paonia, Colorado, is prime elk habitat with herd numbers in the hundreds.

Acres of undisturbed coniferous forests are interspersed with open slopes of wet meadows thick with grasses and sedges, a nutritious diet for elk needing to fatten up for the winter. But houndstongue, a purple-flowered invasive weed that takes root alongside nutritious plants, is toxic to elk. Read more »

Scientists Work to Protect Trees in Southeast Alaska from Non-Native Longhorned Beetles

Alex Vaisvil, a student intern from Xavier University in Cincinnati, Ohio, lowers a Lindgren multi-funnel trap to lure longhorned beetles from the mid-canopy in the Tongass National Forest. Traps were located in the forest as part of a study to refine woodborer trapping methods in Southeast Alaska. (U.S. Forest Service/Elizabeth Graham)

Alex Vaisvil, a student intern from Xavier University in Cincinnati, Ohio, lowers a Lindgren multi-funnel trap to lure longhorned beetles from the mid-canopy in the Tongass National Forest. Traps were located in the forest as part of a study to refine woodborer trapping methods in Southeast Alaska. (U.S. Forest Service/Elizabeth Graham)

Non-native longhorned beetles are easily transported around the world in solid wood packing material, arriving in a new location with no natural enemies to control their populations. Across the country, many of these non-native beetles, particularly the Asian longhorned beetle, have killed tens of thousands of hardwood trees, especially in eastern states.

Will these pests ravage trees in Southeast Alaska? U.S. Forest Service specialists are working to determine ways to prevent the kind of devastation they’ve had elsewhere. Read more »

Wyoming Landowners Restore Riparian Areas in Big Horn Basin

While working for the city of Worland for the Wyoming Game & Fish Department, Rory Karhu, currently a NRCS district conservationist in Park County, spearheaded tamarisk removal along the Gooseberry Creek, a tributary to the Big Horn River. NRCS photo.

While working for the city of Worland for the Wyoming Game & Fish Department, Rory Karhu, currently a NRCS district conservationist in Park County, spearheaded tamarisk removal along the Gooseberry Creek, a tributary to the Big Horn River. NRCS photo.

It took Dee Hillberry six years before he could get a handle on encroaching and hardy invasive vegetation. Working on two separate properties, he removed tamarisk trees, or salt cedars, from 200 acres along Cottonwood Creek and Russian olive trees from 100 acres along the Big Horn River.

Despite Hillberry’s hard work in Hot Springs County, Wyoming, his efforts in restoring riparian areas were part of a larger endeavor that involved work done in phases over several years, over hundreds of miles, and with numerous partners in the Big Horn River basin. The basin is about 100 miles wide, and so far, more than 13,000 acres of invasive trees have been removed from the riparian area. Read more »

Inner City Youth Protect an Ancient Oregon Forest Wilderness

Students from the Inner City Youth Institute acquired a love of the outdoors while removing invasive tansy ragwort from the Drift Creek Wilderness area in the Siuslaw National Forest. (U.S. Forest Service/Brian Hoeh)

Students from the Inner City Youth Institute acquired a love of the outdoors while removing invasive tansy ragwort from the Drift Creek Wilderness area in the Siuslaw National Forest. (U.S. Forest Service/Brian Hoeh)

Inner city youth helped protect an ancient forest wilderness in the Siuslaw National Forest by spending a day removing invasive tansy ragwort.

High school students from the Inner City Youth Institute  in Portland, Oregon, arrived in the Drift Creek Wilderness near the Alsea River, where Douglas fir and western hemlock make up the largest stand of old-growth rainforest in the Oregon Coast Range.

“We love coming to the Siuslaw,” said institute group leader, Stacey Sowders. “We love this chance to do meaningful work and meet people who are so passionate about what they do.” Read more »

Why is Cogongrass So Successful at Invading the South?

Widely used in landscaping, the cold-tolerant cogongrass Red Baron variety does not produce viable seed, but its pollen could present problems in the future. (Auburn University/David Teem, Bugwood.org). Photo used with permission.

Widely used in landscaping, the cold-tolerant cogongrass Red Baron variety does not produce viable seed, but its pollen could present problems in the future. (Auburn University/David Teem, Bugwood.org). Photo used with permission.

This post is part of the Science Tuesday feature series on the USDA blog. Check back each week as we showcase stories and news from the USDA’s rich science and research portfolio.

Cogongrass makes kudzu look like a lightweight. A perennial grass, it grows on every continent except Antarctica and has earned a reputation as one of the worst weeds on Earth. In the South, cogongrass ranks among the top 10 plant marauders, invading forests, rights-of-way, and agricultural fields, literally taking over the landscape and altering ecosystems.

Native to Southeast Asia, the weed first arrived in the United States in 1912 as packing material in orange crates imported to Grand Bay, Alabama.  A few years later, farmers planted cogongrass in Mississippi as a possible forage crop. Since then, it’s spread to more than 66,000 acres throughout the South, its progress limited only by winter cold. Landowners and agencies have fought this weed for years with limited success. Read more »

Virginia Tech Demonstrates New Method to Treat Ash Firewood

Ash logs undergoing vacuum treatment to kill emerald ash borer larvae.  (U.S. Forest Service)

Ash logs undergoing vacuum treatment to kill emerald ash borer larvae. (U.S. Forest Service)

The shiny green one-half-inch-long, one-eighth-inch-wide emerald ash borer has destroyed tens of millions of ash trees in the U.S. since the beetle’s discovery in 2002 in Detroit.

The real Ash trees comprise around seven percent of the trees in eastern U.S. forests. In urban areas, ash trees make up about 50 percent of street trees.

Ash trees are important both economically and ecologically. A wide array of  products are made from ash wood, including baseball bats, tool handles, pool cues, furniture, cabinets, oars, and acoustic and electric guitars. Ash seeds are an important food source for birds, mice, squirrels, and other small mammals. Ash trees also provide essential habitat for cavity nesting birds, such as woodpeckers, owls, and wood ducks. Read more »