If herbicides must be used in a grass pasture, the most effective and economical approach would be to apply 2,4-D in the spring and/or fall to suppress hoary alyssum. Retreatment will likely be necessary in following years. In a pure alfalfa hay field, herbicides applied to dormant stands or following first cutting can suppress hoary alyssum, but are expensive and can injure alfalfa. No herbicide options exist after first cutting. There are no herbicide options for controlling hoary alyssum in a grass/legume (alfalfa or clover) mixed pasture or hay field that do not have significant injury potential to the legume as well. When using herbicides, always read and follow the label carefully. Most herbicides have grazing and harvest restrictions that must be followed.
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