Brake On! controls broad leaves and grasses. Some controlled broadleaf species include annual sowthistle, willowherb, mallow, nightshades, prickly lettuce, knotweed, and puncturevine. The controlled grasses include annual bluegrass, barnyardgrass, crabgrass, and Italian ryegrass. Brake On! registration may help blueberry growers who are looking for an alternative to pendimethalin, while we work with manufacturers and regulatory agencies to reestablish pendimethalin registration in blueberries.