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Weed Resources



Cluster of Mayweed chamomile in bloom
Mayweed Chamomile
Mayweed ChamomileAnthemis cotula L., is native to the Mediterranean region, but has been widely introduced as a weed in the temperate zones. In 1995, it could be found in almost all of the lower 48 states.

Additional Resources:


Our latest weed decision tool.
Herbicide Resistance Weeds Map New

The Herbicide Resistance Weeds Map allows you to see county level results from Dr. Ian Burke’s herbicide resistance testing program at WSU.

Additional Weed Decision Tools

Dynamic decision tools to help you make informed management choices.

PNW Weed Management Handbook

This handbook is designed as a quick and ready reference for weed control practices and herbicides used in various cropping systems or sites in Idaho, Oregon, and Washington.

National Jointed Goatgrass Research Program

The National Jointed Goatgrass Research Program was initiated in 1994 by using a special USDA grant to fund regional research and extension activities directed toward limiting the damage caused by jointed goatgrass to winter wheat production in the western United States. View more information generated over the course of this 15-year program.

Additional Resources

Common Weeds List


Herbicide Resistance Testing Program

Weed ID Quiz


Weed Control Reports

Washington State University