Yes, nothing you can do to stop it this far into flowering, without doing more damage or risk of losing a lot of bud.
that might not be completely true.
now , I have only had mildew once in my grow career. And I believe it was because I tried to partially close my supply and exhaust from my room one time to try to help adjust my temp in the room. Which took away my circulation and fresh air.
PM is a disease in the plants that either you gave them too much nitrogen or dont have enough fans and circulation.
now my treatment to this one time even in my 4 week of flower was
foliar spray mix 1 gallon of stable water ( best you can find)
1 1/2 tsp baking soda.
1 drop superthrive
foliar application. This is the only time I will tell you not to wash your foliar off after spraying. try not to get any on the buds themselves. It will leave a different white residue behind . it is ok.
note**** Baking soda is a ph down!!!!!! carefull .
you only have a few weeks left try it and finish it. If you have clones and young vegs around. Sorry bro, they got to go. Once the mold is air born ir spreads the disease to entire crop.
Fix your air
remove nitrogen
baking soda foliar spray
pray
the infestation looks more than just recent. I think you ignored some red stems before it got this far. Or you had a guest come ever and check out your grow. And he had some mold on him from another grow. Or you baught some clones that the mother was already sick.. Check them leafe stems bro. they get red for a reason.
after three days after applying my treatment. If the red stems dont go away. then its too late. destroy everything, bleach out all your pots, rooms, equipment, anything you touch related to the grow.
sorry bro. it happens.