Simple peroxide spray with water .. Will " control " it a bit til you can harvest .
You can PULL THE most affected leaves ( carefully ) and toss.
It will not cure it but you should be able to slow it down ...
You WILL have to do a bud wash ( you tube ) to clean them up.
Simple dunk methods will clean them up nicely. It removes foliar residue , hair , dust , bugs and other shit .... Hang dry them after dunk over a towel to catch drips. Then you can dry as normal. I do this occasionally ( pet hair ) . It won't strip triches , but very little loss happens. Dunk and twist method.
The MOST important thing is grow room cleanup AFTER HARVEST.
Active Spores will remain so a through cleaning is a must. I spray 50/50 bleach water in my tents after EVERY harvest .... I spray then walk away ... Later I spray again and wipe down ... I pull the drip pans and even clean my fan grills ( unplugged ) . It works well .
You can use pinesol , fabuloso , even Lysol. I spray a Swiffer duster with Lysol and DUST top of my lights ( Quantums) and ventilate tent.
PM sucks , Black Spot sucks , Mites suck ... So it's better to be safe than sorry .
These are washed buds ... Still frosty ... No worries.