Resources for Weed Management


If you are trying to identify a weed, find the newest information on herbicide resistance and other emerging issues in weed management you need to visit was designed to be an ever-growing knowledge base of weed information. Combining biological and identifying characteristics of top interfering species along with new emerging research articles, media, and control options, provides the tools to make informed risk-reducing weed control decisions. is a powerful search tool, simply type in the name of a weed (common names, botanical name, or Bayer code) to access information for that specific weed, or better yet, if you don't know the name of the weed that you need information on, simply search using descriptive terms such as "yellow flower", or "thistle."

Once on an actual weed information page, all the information for that specific weed is displayed, including reference illustrations and photographs.

If you still can not identify the weed species you can send a picture into by clicking on the Weed I.D. Services tab on the left tool bar. However, proper identification is greatly dependent on the quality of the photographs submitted (see "Rules for submitting photos") and completion of the form provided on the site. This site does not guarantee the accuracy of its online weed identification services and as such users requiring a higher degree of accuracy should contact a pest diagnostic clinic within their geographic area.

Ontario Crop IPM: Know how and why it is important to scout and identify weeds, as well as diagnose herbicide injury.

Pesticide Spray Drift

Using Cover Crops for Weed Management


  1. Guide to Weed Control, Publication 75, Ontario Ministry of Agriculture, Food and Rural Affairs. $15.00 + GST. Visit ServiceOntario Publications website or call ServiceOntario Publications Contact Centre at: 1-800-668-9938 or OMAFRA Resource Centres.
  2. Identification Guide to the Weeds of Quebec, Publication VT 007, by Claude Bouchard and Romain Neron, 1999, ISBN 2-89457-174-7, 264 pages. To order: Distribution de livres UNIVERS, 845, rue Marie-Victorin, Saint-Nicholas, Quebec, G7A 3S8, (418) 831-7474 or 1-800-859-7474; fax (418) 831-4021,, $16 + S&H. French version also available.
  3. Weeds of Canada and the Northern United States, by France Royer and Richard Dickenson, University of Alberta Press and Lone Pine Publishing, 141 Athabasca Hall, Edmonton, Alberta, Canada T6G 2E8, paperback, 434 pages, 750 colour photographs and 150 line drawings, 1999 $29.95
  4. Weeds of the Northeast, by Richard H. Uva, Joseph C. Neal, and Joseph M. DiTomaso, Published by Comstock Publishing Associates/ Cornell University Press, Sage House, 512 East State Street, Ithaca, New York, 14850, 1997, paperback, ISBN 0-8014-8334-4, 397 pages, includes 299 weeds.
  5. Wetland Plants and Plant Communities of Minnesota & Wisconsin, 2nd Edition, by Steve D. Eggers and Donald M. Reed, Published by U.S. Army Corps of Engineers, St. Paul District, 1997, paperback, 263 pages., $11.00 US. per copy plus $2.00 for 4th class shipping or $3.50 for first class postage. An order form can be found on the web.
  6. Steel in the Field: A Farmer's Guide to Weed Management Tools, edited by Greg Bowman, 1997. Discusses history of herbicide use and concurrent decline in knowledge about weed management tools. Describes techniques of using a variety of cultivation tools while minimizing erosion and soil compaction. Presents case studies of weed management systems used by farmers throughout U.S., including small and large farmers growing agronomic, horticultural and dryland crops. Includes detailed drawings and explanations of many tools, including hoes, cultivators, flamers and guidance systems. 128 pp. US$18. Sustainable Agriculture Publications, Hills Bldg., University of Vermont, Burlington, VT 05405-0082; phone (802) 656-0471; email
  7. Integrated Vegetation Management (IVM) for Roadsides, by Sheila Daar and Shawn King, 1997. Presents in-depth information about implementing IVM in Washington, with emphasis on how road crews can develop long-term sustainable strategies. Defines IVM as process of monitoring; determining injury levels and action thresholds; proper timing of maintenance efforts; selection of least disruptive control tactics; and evaluation. Includes information about deciding when and where to apply treatments, selecting treatments and monitoring beneficial and noxious vegetation. 180 pp. Free. Contact Don Priest, Urban Pesticide Initiative, U.S. EPA Region X, 1200 6th Avenue, Mail Station ECO 084, Seattle, WA 98101; phone (206) 553-2584; fax (206) 553-1775; email
  8. Weed Seedling Guide, Alberta Agriculture, Food and Rural Development, 1996 62 page booklet, spiral bound field guide with photos and descriptions of 50 seedling broadleaf and grassy weeds.
  9. Common Weed Seedlings of The United States and Canada, produced by the Weed Society of America.
  10. Common Weed Seedlings of the North Central States, NCRE Publication 607, by Andrew J. Chomas, James J. Kells and J. Boyd Carey, Dept. of Crop & Soil Science, Michigan State University, Bulletin Office, 10-B Ag. Hall, East Lansing Michigan, 48824-1039, (517) 355-0240, Email: , paperback, 21 pages, 1998, $2.00 US
  11. The Biology of Canadian Weeds, Publications 1693 & 1765, Edited and compiled by Gerald A. Mulligan, Communications Branch, Agriculture and Agrifood Canada, Ottawa K1A 0C7, 1979 & 1984, paperback, 380 & 415 pages.
  12. The Biology of Canadian Weeds, Contributions 103 to 129, Edited and compiled by P. B. Cavers, Department of Biology, University of Western Ontario, London, Ontario, ©2005 by the Agriculture Institute of Canada, paperback, 516 pages.
  13. Weeds of the Prairies (previously Weeds of Alberta), Alberta Agriculture, Food and Rural Development, Publications Office, 7000-113 St., Edmonton, Alberta T6H 5T6, (780) 427-0391 or Fax (780) 422-8835, paperback, 209 pages, 375 photographs.
  14. Peterson Field Guide to Wildflowers by Roger Tory Peterson and Margaret McKenney. Available from most bookstores, this is a good pictorial guide to identification and includes some species not commonly found in agriculture but similarly may not include all agricultural weeds.
  15. Weeds of California (and other Western States) Joseph DiTomaso and Evelyn A. Healy, ©2007.
    A 2-volume reference book is a practical, easy-to-use guide to the identification and biology of over 700 terrestrial weeds. Included are full descriptions, colour photographs, shortcut identification tables, and identification keys. University of California, Agriculture and Natural Resources, Publication 3488. Order from Communication Services, 6701 San Pablo avenue, 2nd Floor, Oakland California 94608-1239. 1-800-994-8849


Spray Drift Awareness Videos:

"New Tools for Mechanical Weed Control In Vegetables", by Robin Bellinder and Jed Colquhoun, Cornell University, New York; 15 minutes; $7.00US (cheque payable to Cornell University to Sue Thompson, 134A Plant Sciences, Cornell University, Ithaca, NY 14853).

"Vegetable Farmers and their Weed Control Machines" by Vern Grubinger, University of Vermont Cooperative Extension; 1 hour.

"How to Manage Spray Drift" Ridgetown College - Continuing Education 1-800-652-8573.

"No-Till Vegetables", by Steve Groff, Cedar Meadow Farm, 679 Hilldale Rd., Holtwood, PA 17532, (717) 284-5152. Cost : $21.95 + $3 S/H (add $5.00 S/H for overseas orders), .


Weed Control in Agriculture (Course 315), Independent Study: University of Guelph 300 p.  $285.00. Familiarizes growers with weeds and their control, using examples specific to agriculture.  Familiarizes growers with weeds and their control, using examples specific to agriculture. Examines weed biology and the five major methods of weed control: preventive, cultural, mechanical, biological and chemical. Applies this information to field crops, vegetable crops, pasture and rangeland, and non-crop land such as railway lines, hydro right-of-ways and roadsides. Emphasizes an integrated approach to weed problems. Addresses environmental concerns. Includes Video 53, Applications of Agricultural Weed Control and Video 52, Basics of Agricultural Weed Control.


  1. WeedPro75 (developed from HADSS and Ontario Herb). For Corn and Soybean herbicides. Weed Pro 75 is your online herbicide selection tool that puts profitability and environmental safety first. Input basic field information along with the different weed species found in each field and an estimation of how heavy an infestation (density) of each species in that field. Registered herbicides that are effective on the indicated weed spectrum are then listed by most profitable treatments. You can sort the results in multiple ways including environmental impact. Then click the desired treatment name for rates, precautions, and other product information.
  2. HADSS (Herbicide Application Decision Support System) (formerly Ontario Herb). For Corn and Soybean herbicides. Distribution online
  3. Herbicide Mode Of Action And Crop Injury Symptoms CD-ROM: by Gunsolus, J., University of Minnesota, $40 for students and non-profits and $80 for profit organizations (plus taxes, shipping and handling charges) To order: #AG-CS-6893; Credit Card Orders: 1-800-876-8636; Fax orders(Need Billing/Shipping Address): 612-625-6281; E-mail orders(Need Billing/Shipping Address): Mail orders: University of Minnesota Extension Service Distribution Center, 20 Coffey Hall, 1420 Eckles Avenue, St Paul MN 55108-6069 (Please make checks payable to: University of Minnesota).

For more information:
Toll Free: 1-877-424-1300
Author: Kristen Callow - Weed Management Specialist/OMAFRA
Creation Date: 01 June 2000
Last Reviewed: 04 january 2012