Ice really is a great answer to Poa control on Putting Greens

but

Not good when your greens have lots of Poa

or

Not good when the ice is in place long enough to also injure your desirable bentgrass

 #2 Green Greywalls

 #2 Green Greywalls up close (green bentgrass toasted Poa)

Poa smoked on the Putting Green.