After all that talk, basically when its hot out, the roots die back. Above that, poa roots are typically 1-2" in length in the summer, while bentgrass roots are usually 2-8" long. poa doesn't have a lot to give when the heat takes it.
Can you guess where this is from?
The front of #17 green. The soil temp is at 99 degrees.
Our current root system on #17 green.
Sorry, this is not ours. This was on a bentgrass green in Detroit. Big difference in poa and bentgrass.
I am not writing this to make excuses, just supply some facts. We are currently on babysitting mode on #17 green. We have to syringe the green with water about every two hours to keep it from wilting and going backwards on us. Usually in about mid-September is when the temps really start to cool down and the roots start coming back.