Firstly to cover the OP. This summer has been particularly tough in the mid Atlantic and North East as there have been extended stretches of dry or wet weather or a combo of both. Rain has been very hit or miss but the heat set in for most of the summer with July breaking records in many areas. The courses just north of me had nearly 11" for rain from 8-1 to 8-4 while I "only" got the 5" they got from Isaias. My point is a lot of cool season turf is struggling right now and poa is especially having a hard time due to it's shallow roots and general dislike for hot and humid weather. It doesn't help that the last couple of summers have been wet and relatively cool so the turf overall hasn't been stressed as much, so now that it is, it isn't ready for it. The good thing is any area where the poa has died can be seeded to bentgrass and will not be an issue in the future. There are various methods so interseeding with slice seeding (verticutting) being one of them. There are a lot of other factors also that come into play - such as shade, drainage, aeration practices, fertility and chem programs, budget etc that dictate the ability to keep poa out - and it is difficult to get rid of poa from an existing stand, as there usually is a large seed bed.
I've been fortunate to have been at LedgeRock since it's grow in and been managing to favor bentgrass and therefore keep poa out. Yes at times the course is brown around the edges as we push the turf to keep it on the drier side but this stresses the poa and it dies out. I also use a high rate of paclobutrozol growth regulator which the poa doesn't like and helps the bentgrass be more competitive. A lot of people are using primo growth regulator in their programs also but I never have. I know I will take a beating on this from any turf person reading, but Primo is used to strengthen poa, so why anyone would us it in a program to favor bentgrass is still beyond me. Admittedly in a mixed stand it might make sense but trying to grow and keep two different grasses with different growth cycles consistent is next to impossible. Pick one and manage for it, although in a mixed stand it will look ugly until one of the grasses in in the majority. The quickest way is to regrass (assuming you're going to bentgrass) and then manage to keep the poa out from there. I'm happy to say that after 16 years at LedgeRock the fairways and tees are as good as 100% poa free.
I've taken a different philosophy on the greens as they are sand based and I can have a little more control but they have never seen a growth regulator and the poa has been kept out purely by managing for bentgrass. By not using growth regulators, the maintenance requirements of the greens are kept to a minimal and the greens speeds the club is renowned for are achieved with a simple mow and roll. Saying that we did lose a little ground this spring when it warmed up early and then stopped - which woke the poa up and got it growing while the bentgrass stayed mostly dormant. Coupled with an earlier than planned aeration, the poa population probably doubled in two months (from ~1% to ~2%). The 1% has been verified by PSU who are testing a poa control here. Thankfully I have been a test site for PoaCure so was able to get it when it became available and it was applied to all the greens this spring.
It is a great product. It seemed to work exceptionally quick this spring but I think it was due to a lot of the newer poa spots were of an annual variety so once the heat stress came, coupled with the herbicide, it killed the poa quickly. Most of the poa on the greens was no bigger than a dime so overall any death looked like an old ball mark. There were a few areas on collars where the populations were high. I've seen differing results here. In some areas the poa has faded out but in others it wiped out the large area of poa - but I think this is largely due to annual bluegrass weevil stressing the poa in these areas also. It sould be noted that ~30% death looks like 100% so knowing and being being honest to yourself about how much poa is there is important as what can seem like a small percentage can look like a lot.
Poacure is a game changer - I do hate to say that, but from three years of ever increasing trials it has done nothing unexpected. I even sprayed it over the heat of the summer (not recommended) to see what would happen and other than some light discoloration of the bentgrass, it was fine. I have seen some poa recover from the initial applicaitons so it defintely is a couple of years prodocol. As mentioned, I am worried about resistance in the long term but I'm told that it's mode of action means that it should always kill poa. Saying that, I know poa is a very adaptive plant so if one does squeak through then other options will be necessary. In one of the trials I did try a side by side test with some of the older poa controls with mixed results, while Poacure was the standout, some of the older ones like Prograss can still help at keeping populations in check even if they are not as effective as Poacure.
The cost pretty much makes it prohibitive for fairways but I can see it having a place where it is spot sprayed on the worst fairways or areas of fairways or maybe rotating through the course and do a few fairways each year to clean them up.
The current PSU trial is with another poa control product and so far it is looking like it is as good as Poacure, so if it makes it to market then I think it will be relatively easy to keep poa under control on greens. I'm thinking a program of Poacure for a few seasons, using betasan (a pre emergent) spring and fall every year to help prevent new seed popping, skipping poa control for a few seasons until populations get to 2% again, use the new product and then repeating the process will become a cost effective method to keep it under control.
Here are a few pics of Poacure in action from early in the summer.
https://twitter.com/alangfitz/status/1278671155793219585