Time Traveller "spores need a host of some sort, dead leaves will do, they can go dormant & live for months. but if they have nothing to do this with they die !!"
You should leave the Mycological discussion to Vaped. You obviously have no idea how spores operate. Please don't get offended, I just feel that the rest of the readers on this thread should know that you DON'T KNOW WHAT YOU ARE TALKING ABOUT with respect to Mycology. However, most plant problems are brought in by live plants.
Yes, spores can live for years (not months), with no help. They can survive freezing temeratures, hot temps, low humidity, high humidity. There is a reason molds are so prevalent in our atmosphere.
Don't believe me???
Put a piece of bread on your counter and watch what grows over the next few weeks. Make a batch of beer and instead of adding yeast, just put it in a temperate place outside...how do you think they make Jailhouse Hooch. You can't get a delivery from Whitelabs.
So, begerbuddy. Sulfur works. Fungicidal sprays work too. Prevention is key if it is a problem you encounter frequently. Use the Sulfur burner, low, for prevention. Remember an ounce of Mary Jane is worth a pound of Aspen...Ooops, I mean an ounce of prevention is worth a pound of cure.
To get rid of spores you would have to bleach, and wash your entire grow area. Filter your air with HEPA 99.97% filters minumum. And de-louse yourself, necked, every time you enter you room. Not gonna happen.
It so happens those are measure that are used frequently in the gourmet mushroom business. But what you don't know is that they are temporary measures, lasting just long enough so that the mold culture you are propogating (eg Oyster mushrooms) have enough of a head start to COLONIZE the medium before others can, or at least enough so that they can suppress the uprising of another culture. Kinda like the Jews in Germany throughout history.
As for if they are caused by your grow or the vendor...You need to set up an experiment. Easiest way would be to gift a friend some of the vendor cuts (please tell them they are part of the experiment), or you can talk to the vendor, see if they have a problem. They may lie to you, but they may tell you the truth or they may be oblivious and you just helped them.
It sounds like prevention is the key.
DON'T GET RID OF THE BUBBA! Just don't do it! It is the best kush ever. Potent mix of THC, CBD and CBN great for that evening medication.
Last, make sure it really is PM. The Bubba can get salt locked very easily and look like PM, when all it really needed was one (or two) hell of a flushing.
If you wish to learn more about Mycology then I suggest
P.S. Taste with sulfur. Less is more, the less sulfur you use on the burn the less likely you are to wreck the smoke. It is the same concept with spider mite spray. Dose once at doulbe strength or dose four times over a period of time with half-strength? I always go for the latter.