None of these herbicides should be used if a companion crop such as oats or if a mixture of perennial grass and alfalfa are planted. These herbicides control grasses and would injure or kill the grass companion crop. Apply Balan, Eptam, and Treflan to dry surface soil and incorporate immediately into the upper 2 to 3 inches of the soil with a tandem disk, field cultivator or roller harrow. Delayed incorporation will allow the herbicide to volatilize or be broken down by sunlight and reduce its ability to control weeds. Apply herbicides as near to planting as possible to ensure optimum performance.
Several herbicides can control broadleaf weeds and grasses after alfalfa emergence.
Poast Plus can control annual and perennial grasses in seedling alfalfa. Follow directions on the herbicide label in regards to adding adjuvants, wetting agents, crop oil, and liquid nitrogen to the spray solution. Information on weed response and other information on postemergence herbicides is given in Tables I and II . Controlling Weeds in Established Alfalfa Tillage has been used in some areas to remove annual weeds from established alfalfa. It should be done in early spring before alfalfa breaks dormancy to reduce injury to the alfalfa plant.