The following are a few of many Web sites that have information about weeds. Readers are encouraged to search other Internet sites or publications that may address their specific interests.

Invasivespecies.gov (http://www.invasivespecies.gov/) describes itself as a gateway to Federal and State invasive species activities and programs.

The INVADERS database (http://invader.dbs.umt.edu/) is a comprehensive database of exotic plant names and weed distribution records for five States in the Northwestern United States.

The Center for Invasive Plant Management (http://www.weedcenter.org) is a joint effort of a coalition of agencies, organizations, and individuals interested in managing invasive plants and maintaining healthy ecosystems in Western North America. Site contents include invasive plant information, invasive plant management, fire and drought early warnings, invasive plant education, grants, and restoration.

The Montana Weed Control Association noxious weed information site (http://www.mtweed.org/) provides information on weed identification, the dangers of noxious weeds, and recommendations for control.

The National Roadside Vegetation Management Association (http://nrvma.org/index.html) is a network of Federal, State, county, city, university and industry personnel dedicated to providing expertise, solutions and networking opportunities to personnel involved in integrated roadside vegetation management and in providing safe, beautiful roadsides.

Houndstongue—sometimes called gypsy flower—
is a drought-resistant weed introduced from
Europe in the early 1800s in contaminated crop
seed. It prefers open, disturbed ground, such as
that created by road construction and maintenance.
—Photo by Sara Lustgraaf, USDA Forest Service.

Road Oyl (Road Products Corp.)
P.O. Box 22044
Knoxville, TN 37933
Phone: 800–685–0539

EMC SQUARED system (Soil Stabilization Products Co., Inc.)
P.O. Box 2779
Merced, CA 95344–0779
Phone: 800–523–9992

Stabilizer (Stabilizer Solutions, Inc.)
4832 East Indian School Rd.
Phoenix, AZ 85018
Phone: 800–336–2468

Soil-Sement (Midwest Industrial Supply, Inc.)
P.O. Box 8431
Canton, OH 44711
Phone: 800–321–0699

Pennzsuppress D (Pennzoil Products Co.)
John Snedden, National Sales Manager
100 Pennzoil Dr.
Johnstown, PA 15909

Johnsongrass was introduced into Alabama in the 1830s as a pasture
grass from eastern Europe. It has become a roadside safety hazard that
obscures visibility and increases the intensity of roadside fires.