Late planting challenges weed control
Since control efforts were hampered in some areas, Loux is hopeful affected producers will better understand how significantly their fields are infested with resistant weed populations and plan accordingly for next year.
"Because we have up to two types of resistance in some marestail populations, the biggest thing is to realize you have a problem," he said. "More of it is going to go to seed this year than last year. When you plan for next year, consider a fall application of herbicide, and be aggressive enough to control it next year."
The basic control recommendation in no-till soybeans, where Loux sees the most weed control issues, is to use a comprehensive spring burndown herbicide protocol while using the correct rate of a residual control product at the same time. Beyond that, farmers can modify a post-emergence application of glyphosate as needed.
He said some plans do include a fall application for marestail or other problem weeds, as well.
"For historically resistant fields, farmers can consider some Liberty Link soybeans to break up the use of glyphosate and get those issues under control," Loux advised. "Some farmers aren't willing to do that, though, because the variety selection there isn't as diverse."