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 …
Jul 09
Horseweed resistant to certain herbicides
