Green Defenders Stop Medusahead Invaders

January 4th, 2010 by Tina Casey

Medusahead was notorious as one of the worst range weeds in the Western U.S. fifty years ago, and it’s gotten even worse since then. The weed is as nasty as its name sounds. An invasive species, medusahead popped up in Oregon in 1903 and it’s been wreaking havoc on rangelands from North Dakota to Texas to the west coast ever since.

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Agriculturists have tried to control medusahead through burning, tilling, prescribed grazing, and the herbicide imazapic. All have certain risks and drawbacks, and the weed has marched on…until now. In an Oregon test area, the U.S. Department of Agriculture has planted bands of desert wheatgrass at the edge of a medusahead infestation, and so far the barriers have practically stopped the noxious weed in its tracks.

Medusahead and Rangeland

Medusahead crowds out and kills native plants including sagebrush, squirreltail, and needlegrass, which results in a severely degraded wildlife habitat. Particularly alarming to the fire-ravaged West is medusahead’s propensity to burn after its seasonal dieoff, and the frequent fires suppress less resistant native plants. As for domestic animals, Medusahead’s high content of silica (a gritty mineral that wears away teeth) makes it highly unsuitable for grazing.

A Sustainable Solution for Medusahead

The wheatgrass solution shows promise, though one drawback is the possibility that it could over-compete with native species where it is planted. The USDA will be studying that as the research project progresses. If wheatgrass does prove both safe and effective, a similar barrier-style solution could provide the biofuel industry with a sustainable, ecologically sound way to cultivate weedy biofuel crops without letting them run rampant.

Image: Medusahead by Brett Bingham courtesy of the USDA.

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Tags: habitat protection, invasive species, medusahead, rangelands, weed

About the Author

Tina Casey Tina Casey specializes in military and corporate sustainability, advanced technology, emerging materials, biofuels, and water and wastewater issues. Tina’s articles are reposted frequently on Reuters, Scientific American, and many other sites. Views expressed are her own. Follow her on Twitter @TinaMCasey and Google+.

JJ

Umh, David MacKay doesn’t even have a chapter on invasive species yet and the effects of not tackling global warming by humbling ourselves with make believe energy independance.

But he does cover the more interesting subject of Food and Farming in chapter 13 of

drum roll please

“Sustainable Energy — without the hot air” by David Mackay, all 400 pages for just 0 grains of rice.

Hey do you know the story of doubling 1 grain of rice 64 times on the chess board, how much grain that would be, its a tale of 1 smart guy versus the math stupid innumerate emperor.
JJ

Umh, David MacKay doesn’t even have a chapter on invasive species yet and the effects of not tackling global warming by humbling ourselves with make believe energy independance.

But he does cover the more interesting subject of Food and Farming in chapter 13 of

drum roll please

“Sustainable Energy — without the hot air” by David Mackay, all 400 pages for just 0 grains of rice.

Hey do you know the story of doubling 1 grain of rice 64 times on the chess board, how much grain that would be, its a tale of 1 smart guy versus the math stupid innumerate emperor.
http://extremegreenvillage.com Bob Henry

All these problems will be solved in the future if you follow the progress of mechanized agriculture.
http://extremegreenvillage.com Bob Henry

All these problems will be solved in the future if you follow the progress of mechanized agriculture.