You dropped a bomb on me, baby...

@Ga4rd2en0er, yeah man and me the reverse lol see with the powder the technology is simple you spray spores onto the plant and hopefully some of them will germinate into bacteria that will survive the lights long enough to reproduce, during an outbreak you want to spray upwards of 3 times a week in peace time you can apply the bt every 10 days or even once a month depending on how well they take hold, and they do take hold : a very virulent thing it is BT & BTi !

@CRiSPrGrow, I was unaware BT was available in powdered form. I've only found premixed bottles in the stores here.

@Ga4rd2en0er, "carrier solution" you mean when you mix the powder with tap water? that's the only stuff i know about and i use myself. the way mine works is i mix the greyish powder with tap water then i use that in the feed and as a foliar spray an hour before lights on and a half an hour before lights off (works better at night because the spores dont like the light) ...

@Ga4rd2en0er, ah wow interesting, had no idea, i usually use beneficials to combat such things but i'll look into the sulfur thing, thanks for the infio btw ! 👊

@CRiSPrGrow, spraying sulfur to try and prevent powdery mildew and downey mildew which is rampant in California, especially coastal regions. Sulfur is an old school method of preventive. I can apply it as a dust which is what I'll try next application.