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The herbicide treatments were glyphosate, glyphosate and metsulfuron-methyl, triclopyr, and triclopyr and metsulfuron-methyl. Metsulfuron-methyl has some soil activity, so there was concern about ...
They tolerate almost all hormone herbicides (MCPA, 2,4-D, clopyralid, dicamba, triclopyr, picloram), and speedwells are about the only weeds which survive a triclopyr/picloram mixture (Victory Gold).