In the photo each flag is marking an unfixed or improperly fixed ball mark. An unrepaired ball mark will give annual bluegrass (Poa annua) an opening to germinate and contaminate our bentgrass greens. There is not a chemical control for Poa annua yet that doesn't also adversely affect the bentgrass. Growth regulators help keep Poa annua invasion to a minimum but it does not provide total control. Our staff is using all of the tools that are currently available to contol Poa annua, but we need everyones help to keep our greens free of Poa annua.
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