Weed identification (ID) on a farm can sometimes be a tedious task. But weeds must be identified prior to weed control activities. Two weed species may look very similar at a given growth stage but may differ greatly in terms of the life cycle, modes of reproduction, crop-weed competition, and responses to control tactics.
This part of the website can help you identify weeds that may be a problem in your area. We have separated weed ID resources into the following three categories.
Use web-based tools or smartphone apps to identify weeds. Use these tools if you know what the weed looks like or where it grows but not its name.
Smartphone apps (iOS or Android)
Photo Galleries (by region):
Use weed ID galleries if you know what the weed looks like or its name or when researching specific weeds of your region to learn common potential problem weeds. Find photos and identifying characteristics that will help you identify common weeds and learn more about them.
Guides (hard copy):
If you like to have a hard copy or book handy for your reference to ID weeds while in the field.
IPM Pocket Guide for Weed ID in Field Crops
Michigan State University ($16)
Weed ID and Herbicide Injury Guide
University of Missouri ($21)
Weed ID Field Guide
Iowa State University ($10)
Weeds of the Northeast
Weeds of the NortheastRichard H. Uva, Joseph C. Neal, and Joseph M. DiTomaso
Weeds of the South
Weeds of the Southedited by Charles T. Bryson and Michael S. DeFelice
Weeds of the Midwestern United States and Central Canada
Weeds of the Midwestern United States and Central Canadaedited by Charles T. Bryson & Michael S. DeFelice
Weeds of the West
Weeds of the Westby Tom D. Whitson, Larry C. Burrill, Steven A. Dewey, David W. Cudney, and B.E. Nelson