
Goats May Quell Weedy Tall WhitetopBy Marcia Wood July
15, 1998Hungry goats might help stop the spread of tall whitetop, a weed crowding
out native plants in western states. In a preliminary summer grazing test with
13 young goats, the animals ate the white-flowered weed with no ill effects,
according to scientists with USDA's Agricultural
Research Service. The goat's good health is key because scientists aren't
completely certain whether the plant is poisonous to animals. A combination of tactics--grazing, herbicides, mowing, and seeding with
aggressive annual plants--might be needed to thwart the weed. Today's ranchers
and other land managers have no fast, easy way to keep it at bay. Cattle and
sheep will graze tall whitetop growing amid other plants, but won't tackle pure,
dense stands of the weed. For the grazing experiment, researchers fenced the goats in an infested
meadow. The animals grazed thick stands of the weed along with regrowth from
those stands and from mowed stands. They ate about 75 percent of the young,
tender, more digestible regrowth, compared to about half the vegetation in older
stands. Also known as perennial pepperweed, tall whitetop has cropped up in nearly
every western state. It's also well-established in New England. Tall whitetop
typically grows from 1 foot to more than 3 feet high--and up to 8 feet tall in
wet sites such as along streams, rivers, ditches, irrigation canals and salty
marshes. More details are in the July issue of ARS' Agricultural Researchmagazine, accessible on the World Wide Web at: http://www.ars.usda.gov/is/AR/archive/jul98/tall0798.htm Scientific contacts: James A. Young, USDA-ARS Ecology of Temperate
Desert Rangelands Research Unit, 920 Valley Rd., Reno, NV 89512, phone (702)
784-6057, fax (702) 784-1712, [email protected]or Lynn F. James, USDA-ARS Poisonous Plant Research Laboratory, 1150 E. 14 N.,
Logan, UT 84341, phone (435) 752-2941, fax (435) 753-5681,
[email protected]. U.S. Department of Agriculture | |