A University
of Missouri plant science research assistant says glyphosate and cloransulam, known
as Roundup and First Rate, are not effective killers of horseweed.
Eric Oseland
tells Brownfield horseweed has built up a resistance to certain herbicides.
“We did not
find any populations that were able to be controlled with glyphosate,” Oseland
says. “We’ve really lost that herbicide for controlling horseweed and even the
ALS inhibiting herbicide is almost eighty-percent of the populations we screened
were resistant to that as well.”
He says the
most effective herbicides against horseweed are dicamba and 2,4-D.
Continue reading Horseweed resistant to certain herbicides at Brownfield Ag News.
