The publication also includes tips and tables on using specific herbicides for pre- and post-emergence control.
Johnson said Palmer Amaranth damage likely will be much more severe for soybean fields than corn fields because there are fewer herbicide options for soybeans.
In addition to being available online, the publication will be handed out this winter during herbicide-resistant weed meetings around the state.
Details on the meetings are:
- Jasper County: Jan. 24, Rensselaer. Contact Bryan Overstreet at 219-866-5741 for more information.
- Tippecanoe County: Feb. 21, West Lafayette. Contact Jeff Phillips at 765-474-0793 for more information.
- Jackson County: Feb. 28, Seymour. Contact Richard Beckort at 812-358-6101 for more information.
A meeting brochure is available at https://ag.purdue.edu/btny/weedscience/Documents/resistance.pdf