Interesting, but it makes perfect sense to me. Early on I received a cut from a guy who lives in the delta region of California, an area well known for its heavy agriculture use. It began showing these spots that no one could diagnose (no one from the cannabis world, that is). So, I started searching university extensions, and eventually figured out that it was Septoria, aka black spot fungus. I treated it, but ended up having to go with a dosing rate half again as strong as what was recommended on the bottle to eradicate the problem. I figured that was likely because, coming from a heavily farmed and landscaped community, whatever fungus that cut was experiencing was likely something already well accustomed to normal treatment rates, i.e. resistant.
So, being so near all this heavy ag activity, I'm especially careful to look through all avenues for information, not just cannabis avenues.
