Mark,
My observation over the years has been that if poa annua is present in the fairways, then it is a losing battle to keep it off the greens.
My home club here in Melbourne is an example of that. About 12 years ago it embarked upon a programme in tandem with an outside consultant to rid the greens of poa annua.
After virorous rooting out of the poa and the consequent severe disruption to the members' enjoyment over three years, the greens were beginning to show signs of improvement in regards to bent coverage.
At the time, (and still), poa is omnipresent on the fairways, and I clearly remember the consultant remarking that if the fairways weren't rid of poa, then it was losing battle.
Shortly thereafter he was sacked, and the greens returned to their poa characteristics. Now eveyone putts through the "flower beds", however, there are those who think the greens are "great".
POA IN GENERAL IN NZ
Off the top of my head Mark, I can't think of any course in NZ, with the exception of Gulf Harbour, that doesn't have poa greens. It seems almost a natural grass in NZ. It is about four years since I played Gulf Harbour, so maybe that layout is now infested with the species as well. At time of playing GH(about a week before the World Cup was held there), I was of the opinion that they were amongst the best greens I had ever played on. I might be wrong but I think they were Egmont Bent??
PORTSEA
I was a member there for some time Mark in the 1960s and early 1970s. At that time the greens were hard bent greens making it very difficult to stop the balls on the surface.
One of the founders of the club, Val Peddle, a Melbourne wholesale butcher, insisted on bent greens and he got them, and they were amongst the best in Melbourne, even if they were frustrating in trying to stop the ball on them.
I haven't been down there since Mike C and his team have been looking after the lovely Peninsula layout, but from all reports it would seem they have been returned to their glory days.
Sloan Morpeth during the 1960s would occasionally come down to Portsea and play a round of golf and suggest a few improvements to Val Peddle, the greens committee and the superintendent, but the club had a small membership, didn't have proper clubhouse and was hamstrung with a low dollar turnover, so other things took priority over the course during those years.
It was after Val Peddle became ill, and the superintendent retired, that the the course went backwards, however, the fortunes of the Portsea Golf Club have been revived, which is good news to anyone who loves a seaside course.
NZ
I will be over in Wellington in April Mark, and I wouldn't mind meeting up with you for a beer and a round at "Pram".