Barricade- Economical control of Poa Annua in overseeded warm season grasses Barricades proven performance controlling Poa annua, annual bluegrass, has made it the choice of golf course superintendents. Now Barricade may be used prior to overseeding with perennial ryegrass to control Poa annua. Numerous trials by researchers and superintendents have shown that Barricade can be used safely with little or no effect to ryegrass overseed while providing economical Poa control. For more information and the Barricade supplemental label, please contact your local Novartis distributor.