Over the last couple of years, we have documented the presence of glyphosate-resistant Palmer amaranth in several fields around Kansas. Farmers who have had issues controlling Palmer amaranth with glyphosate should assume they might have resistance and plan accordingly for the future.
We suspect that glyphosate resistance in Palmer amaranth is about to explode, so testing every field becomes impractical. However, Dr. Mithila Jugulam would like to collect seed from different populations of suspected glyphosate-resistant Palmer amaranth to do some more detailed research among different populations to compare the level of resistance and the genetic basis for the resistance.
Thus, she would be interested in obtaining seed samples from fields with suspected glyphosate-resistant Palmer amaranth, or contacted about where such fields might be located. Seed can be collected by simply clipping the seed heads (females have the prickly seed heads) and placing them in a paper bag. Any information about field and herbicide treatment history and the location of the field would also be beneficial.
Please contact either Mithila Jugulam or Dallas Peterson at the email address or phone number below if you can collect some seed samples, or if you can point us in the direction of fields with suspected glyphosate-resistant Palmer amaranth escapes.
Mithila Jugulam, Weed Physiology
Dallas Peterson, Weed Management Specialist