INTERNATIONAL HERBICIDE-RESISTANT WEED DATABASE
If you do not find help here please contact us at
There are numerous ways
you can add data. Whereever you see a link that says "Edit" or "Add
Note" then click on it and it will allow you to edit data once you have
logged on using your UserName and Password. Editing links primarily
occur on pages that contain detailed information about a specific case of
resistance. Scroll down these pages and you will see where to edit a
case. An example of how to get to such a case:
select a weed from the species pull down menu - hit go
Click on a country within the table
You will have chosen a specific case of resistance that can be
You can also upload any type of
You must be logged in to edit your information you can login here or click "login" at the top right of every page.
Your logon Username is the email listed with this site and your password can be retrieved from here by entering your email
To find your contact information go to to the "
page and search for your name using the pull down menus. Then click on
button in the top right hand corner of your user information.
Alternatively - wherever you see the word
- associated with your name (if you report
resistant weeds it will appear many places throughout the web site) then click
on it and you will be taken to a form to update your contact
If you have been
involved with the reporting of herbicide resistant weeds you are probably
already in our database. You can check to see if you are listed by:
Go to the "
and search for your name using the pull down menus or
Go to the "
page - you can select your name from a list and then have your password
e-mailed to you automatically.
You have many options -
go to the home page (click on WeedScience.com) listed at the top left of this
page. The main thing is to
click on links within tables!
Use the pull down menus to find a weed by:
- select a weed and click
go. It then lists all the occurrences of herbicide resistance in this
species. Once this table downloads you can then CLICK a the COUNTRY
to get a detailed view of a case of resistance.
- Same as above
Herbicide Mode of Action
- Lists by MOA
- Lists by Country
- This is a bit different!
Here you not only get a list of herbicide resistant weeds for a state, but you
also get a summary for the state. Go to the home page and select a state
- such as California - to see what you get.
Again, the best way to utilize this database is to click on
links within tables!
Heap, I. The International Survey of Herbicide Resistant Weeds. Online. Internet.
Wednesday, February 8, 2023
We will keep adding to
this section - if you have a question or suggestion please contact us at
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.
Copyright © 1993-
WeedScience.org All rights reserved. Fair use of this material is encouraged. Proper citation is requested.