National

Agro Engineering Inc. http://www.agro.com/
Cooper Mill LTD http://www.coopermill.com/
CWC Chemicals http://www.cwc-chemical.com/
Iowa State University IPM http://www.ipm.iastate.edu/ipm/
Meister Pro http://www.meisterpro.com/
SePro http://www.sepro.com/
Round Up http://www.roundup.com/
University of Minnesota Extension Service Weed Control http://www.extension.umn.edu/topics.html?topic=4&subtopic=100
USDA Aphis Plant Protection and Quarantine - Noxious Weeds Home Page http://www.aphis.usda.gov/plant_health/index.shtml
Weed Science Society of America http://www.wssa.net/

Regional

Integrated Pest Management in the Western Region http://www.wrpmc.ucdavis.edu/
Western Society of Weed Science http://www.wsweedscience.org/

Local

Malheur Experiment Station Weed Control http://www.cropinfo.net/
Oregon Department of Agriculture http://oregon.gov/ODA/PLANT/index.shtml
Oregon State University Weed Science http://cropandsoil.oregonstate.edu/weeds/