It does not have a deep root structure to hold the tuff together.
Irigation encourages its growth because the roots are right near the surface.
By shaving the grass surface right back now, the hot sun will kill it and allow the rye grass to get better established.
I didn’t know that the Riccarton track had poa in it, as I live in the NI and all I could see was what I saw on TV.
Now I know why Riccarton chips out all the time. The track is the worst in the country for it.
Its a combination of a hard pan underneath, poa and too much irrigation, pure and simple.