9/6/2013 5:09 PM
The old time thing was to spray Kerb right as the Poa germinated (we're talking get on your hands and knees here). Let it sit for 7-10 days than spray a high concentration of Gro-Safe (activated charcoal), then overseed. It was a mess, but it worked pretty well. I worked for a superintendent who used a helicopter to spray the charcoal. It worked great on the greens, but produced black sand, trees, flags, pins, green keepers, you name it! This job was a lot more fun in the old days!