Add A New Resistance Case

If you know of a case that should be on the site but you are not the researcher then please let me know who to contact.  If you are the researcher involved then please email the details of the new resistance case, or changes to an existing case to :
I will post the case for you.

Click Here for an Overview of Documentation of Herbicide-Resistant Weeds

If you are reporting on a Brazilian case of resistance then please use these instructions.
Informe Técnico 7 - Ten steps for reports of new cases of herbicide resistance of weeds in Brazil.pdf

At a minimum please provide:
  • Year and location seed was collected
  • The type of tests that were done and a table or dose response curve for each of the herbicides (I don’t make that public, but I need it to post the case)
  • The crop(s) that it was found in
  • The people you want listed as contributors

PERMISSION MUST BE OBTAINED FIRST if you intend to base a significant portion of a scientific paper on data derived from this site. Citation:
Heap, I.  The International Herbicide-Resistant Weed Database.  Online.  Monday, July 22, 2024 .  Available Copyright © 1993- 2024 All rights reserved. Fair use of this material is encouraged. Proper citation is requested.