Blue green algae...

Blue green algae is a common problem on newer bentgrass greens.

It is a discoloration in the plant due to what is believed to be a release of a toxin by the algae that causes the chlorotic look of the plant. It is not deadly but is merely unsightly.

You will notice it in the shaded areas of the greens mainly in the morning hours. Chemical controls are being applied to suppress the algae and mask the effects. Again, let it be known that it does not kill the plant.