Retrieve Password




How It Works
  • When you register you supply an email address and a password.  Your email address is your username and if you forget your password then you can retrieve it by entering your email address and clicking on the "Email My Password" button.
  • If the email address listed on this site is no longer valid then you should send a note requesting that your email address be changed.
  • Click on the "Comment/Question/Report Error" button at the top of the left menu bar to request an email change. 


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.  Friday, September 22, 2023 .  Available Copyright © 1993- 2023 All rights reserved. Fair use of this material is encouraged. Proper citation is requested.