Aaron Saeugling is an Iowa State University Extension agronomist in southwest Iowa.
“In this part of the state, we’ve seen an increase in terms of just the sheer number of fields that we’re having some challenges with glyphosate controlling weeds,” Saeugling says.
“Waterhemp has been a big one across the Midwest—and that’s the same thing here,” he says. “The bigger challenge we’re running into now is marestail, or horseweed. That’s a winter annual here and it gets to be a real challenge for producers, as well as ag retailers.”