When is the best time to control weeds in perennial forage fields?
A weed control program for perennial forage crops should start 1 to 2 years prior to seeding. The hard to control weed problems, (Canada thistle, quack grass, tansy, toadflax, ox-eye daisy, scentless chamomile) need to be controlled in annual crops prior to seeding the perennial forage. Using glyphosate for total vegetation pre-harvest control in annual crops, spot application of herbicide with residual activity for specific problems, or cutting and mowing bad weed areas are some options.