Ninjadogma
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I read somewhere that silica can help prevent wpm in plants, by strengthening cell walls here’s a quick google search to back up that statement:
Yes, adding
soluble silica to water can help prevent white powdery mildew (WPM) by strengthening plant cell walls and boosting their natural defenses. This makes it physically harder for fungal hyphae to penetrate plant tissue.
I do supplement with silica and humic for ancillary support. I acquired a couple plants that were from an outside grow that were getting all the rain we recently got hit with. They were treated before I took em but I saw some of the residue and got paranoid, that's all. All I was probably really seeing was the "ghosts of PM past."