According to recent studies PM is not systemic as previously assumed and thought to be . I remember being taught in Greenhouse management class that it was and my old notes from MSU's Master Gardner Program said just the same .
I have always taken it to be so until recent research showed different , but none the less I still take all precautions and this seasonal bullshit this year is wreaking havoc with Pm infestations state wide. , Indoor PM is more prone to attack environments where the temp and humidity swings are most prevalent , such as Basements and Pole Barns and outhouses lacking insulation .
There are many PM products and methods of destruction but prevention is the major key word when all said and done .. In this situation it might be feasible in between grows to use Ozone or even Sulfur burners but if permissible budget wise UV-C clean Lighting is the cats meow as it destroys pm spores on contact and this can be shined on the plants , walls and all other surfaces as well
