I’ve been battling wpm for about a year now. I’ve got a thread detailing all the things I’ve tried. I’ve literally scoured the internet and spent a lot of $$ trying to find a solution. I’ve tried it all. I even built an entirely new grow space and ran an ozone generator before anything went in there. Nothing really killed it. Most things I tried of nuked my plants, stunk like poo, or just knocked it back a peg.
I thought I had it beat a few months ago, but it came back again.
We’re both in Vt, so perhaps I can help you best since we’re in the same environment.
Right now I’ve got my flower room running 75%rh. Yes, that’s right. Apparently wpm will not “fruit” in super high humidity. It may still be there, but it won’t “fruit” and spore. The trick is keeping condensation from forming on the buds at lights out. I’m still working on that, since the dew will promote bud rot. I haven’t seen wpm in the flowering room since upping the rh.
I’ve also found a product called JMS Stylet oil ( the organic one). It’s odorless, scentless, doesn’t nuke plants, and Is supposedly fine for use up to about a week before harvest.
Everything I’ve sprayed it on has shown zero signs of wpm for about 2 weeks. The plants in my flower room have shown zero signs for 4 weeks now. The ones in the 50-60rh veg room have shown a resurgence about every 14-20 days.
I have a couple plants that were infected, that I put outside. They continued to show wpm signs until I sprayed the JMS. I’ve hit them 2x with it, the last time was over a month ago, and they show zero signs of wpm.
It’s about $55/gal, and the best thing I’ve tried. It’s the ONLY thing I’ve tried that actually knocks it down. They recommend spraying every 2 weeks.
Of all the things I’ve tried (haven’t tried green cleaner yet) it’s the only one that’s shown promise.
I’m hoping within a grow or two I manage to finally get rid of this curse.