Herbicide classification and chemistry
Visit the U of M Applied Weeds website with links to fact sheets and herbicide classification by common and trade names, sites of action and herbicide family chemistry.
This poster, developed by Take Action: Herbicide-Resistance Management groups herbicides by sites of action to help you maintain greater diversity in herbicide use and to delay resistance development. 2016
Number of months between corn and soybean herbicide applications and the following crop for herbicides included in the diversification strategies. (190 K PDF)
Residual herbicides are a key management tool in corn and soybean production, but may interfere with cover crops. 2016 (569 K PDF)
Factors affecting herbicide drift, including nozzle selection, spraying pressure, wind speed and direction, and the use of drift retardants. Crop News, 2015
Longevity of residual herbicides and considerations for incorporation in a dry year. Crop News, 2015
Uniform application of chemicals at proper rates at the proper time is essential for effective weed control. Even slight variations may result in poor weed control or injury to the crop or environment. Reviewed 2008.
Herbicide spray drift demonstration
This herbicide spray drift demonstration shows off-target movement of glyphosate in oat plots when using a variety of nozzle types with different droplet size classifications. Six different nozzle types were used with droplet sizes ranging from fine to ultra coarse.