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Giant ragweed shows resistance to glysophate Tuesday, July 3, 2007
Agri News staff writer
WASECA, Minn. -- Giant ragweed with suspected resistance to glysophate have been discovered in central Minnesota.
The field has been treated solely with glysophate for six to eight years, said Extension agronomist Jeff Gunsolus, who specializes in weed management. There is no evidence of any pre-emergence herbicide applications nor any tank mixes.
The four pots of giant ragweed were displayed at the Southern Research and Outreach Center field day on June 19 and will be on display at the University of Minnesota field days the week of July 9. Gunsolus is carting the pots with him across the state.
"They're my buddies," he said.
In one pot, a pretty healthy giant ragweed has been treated at the label rate of glysophate. In the second, there's a ragweed that's been treated at twice the label rate. In the third and fourth, ragweed treated at four and eight times the label rate is growing.
The ragweed in the fourth pot is short and bushy, but still healthy enough to produce seed, Gunsolus said.
He suspects this isn't an isolated incidence. Last year, he received calls from southeast Minnesota and west central Minnesota questioning the effectiveness of glysophate weed control. His goal in carting the pots across the state is to alert farmers that glysophate resistance can happen.
"Mix it up a little bit," Gunsolus said. "Diversify your chemistry. Be proactive." |
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