With Bentgrass greens, one of the worst weeds to have a problem with is Poa Annua (Annual Bluegrass). There is not a cost effective chemical control on the market for removing Poa from Bentgrass. For this reason, we have to remove it as we spot it or it will spread quickly and be an even larger problem.
I like to pick it out if we catch it small enough, or plug it out if it is too large to pick. Here are some pictures of each way.
We had to remove a few spots today from #1 green. With aerification coming up next week, we wanted to remove it to keep from transplanting it in other areas of the green with the aerifier.
We like to dot it with paint to count how many plugs we will need.
One of these spots was small enough to pick out with a pocket knife. There are still several larger spots that will have to be plugged in this area.
After it is out, we mend the edges like a big ball mark and topdress with sand.
Here is a larger spot that had to be plugged out with our hex plugger.
When picking or plugging, the main thing is to get all of the poa. Here is the new plug from our nursery green that replaced the poa infested plug. We topdressed it with green sand to help with the healing process.