Crop -- Plant Back Restrictions -- Weed ID
The correct choice of a herbicide is dependent on at least three things: The current crop, the next crop (and timeline), and the weeds you are targeting. Use this form to enter your field information. A list of herbicides registered in Montana for the conditions you specify will be generated. Current labels can be found by clicking on the herbicide name or at the Crop Data Management Systems website. Be sure to check the label that comes with your purchased product before making an application.
The intent of this web-tool is not to rank or recommend any particular herbicide, but to reduce the number of choices availiable by filtering out those chemicals that do not fit your crop, crop rotation interval, and weed spectrum.
Start the selection process by choosing the intial conditions of crop, rotation interval to the next crop and at least one weed. Click on "Build the Table" to generate a results table. You can add additional weeds directly from the page with the results table. This tool will suggest certain combinations or tank mixes, but be sure to check the labels before proceeding. We are not making a herbicide recommendation, but are helping you find the best solution for weed control in your cropping system.
'Post' indicates herbicide will be applied after the targetted weed has emerged. Typically this means the herbicide is absorbed through the plant foliage.
'Pre' indicates the herbicide will be applied prior to weed emergence and may also mean application needs to occur prior to crop emergence or even crop planting. Typically soil applied herbicides have some residual activity. Check the label for the specific timing required for the herbicide application.
Prices are an estimate of cost of product per acre and should be used for relative comparisons between products. These prices are compiled from published information from North Dakota State University (NDSU) and the University of Nebraska (UNL). Prices vary across regions, and are dictated by local economic factors. Use these prices as guidelines in your decisions for weed control.
Links to Weed Identification Websites and Apps
- Common Weed Seedlings of the North Central States this guide has great seedling pictures, but is a large file (4.4 M)
- British Columbia's Field Guide to Noxious and Other Selected Weeds
- Broadleaf and Grass Weed Seedling ID Key a black and white line drawing and dichotomous key from the University of Minnesota.
- Weed ID Resources photos of seedlings from Iowa State Weed Science.
- Crop & Garden Weeds photos from University of Missouri.
- Weed View photos from University of Nebraska (best viewed using Microsoft IE)
- BASF WeedID This you-tube video explains how to download and use this App on your smart phone.