It’s been 20 years since the first glyphosate-resistant broadleaf weed was confirmed. University of Delaware Extension weed specialist Mark VanGessel documented the first case of resistant marestail. “We documented it and about the same time Tennessee started working with it.” Resistant marestail continues to expand across the country. “There are more than 25 states reporting resistant marestail. We are managing it differently now,” said VanGessel. “There are new technologies available including dicamba and 2, 4-D.” VanGessel was the keynote speaker at the Wild World of Weeds workshop.
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