Weeds should be no more than 2 to 3 inches tall, and rosettes should be no more than 2 inches in diameter for best results. Butyrac can be used on established or new stands of alfalfa, clover, and birdsfoot trefoil. Do not use on sweet clover. Pursuit should be applied when alfalfa is in at least the 2nd trifoliate stage, but before alfalfa growth exceeds 3 inches to allow for adequate spray coverage on weeds. Apply when weeds are 1 to 3 inches tall, or before rosettes exceed 3 inches in diameter.
Pursuit is effective on most small winter annual weeds.
Pursuit may cause injury to small forage grasses - we do not have data on grass tolerance. Alfalfa should have at least 4 trifoliates. Buctril can cause crop leaf burn. Do not apply when temperatures will exceed 70 degrees on the day of and for three days following application. Both herbicides are effective on most annual grasses, but Select is more effective on quackgrass and other perennial grasses.