Please help me figure this one out, I use tap water, FF Grow Big and Big Bloom, Bloom Roots and Bloom Cal (its a calmag), and have added a touch of FF Open Sesame as I'm about to flower. It's showing up on plants that have vegged for months and some clones from them. Could it be a systemic Fungi? I treated with Eagle 20EW in case, and am going to treat with Organocide, the mothers had received organocide and serenade in the past. I've never had a problem like this before, it kind of looks like what I've been told is a phosphorous deficiency during veg but I can't tell. Some have said magnesium but I doubt it, I use a calmag, and tap water, unless there's a lockout issue. Boron defencies look somewhat like that black patch, I could do a foliar spray with boric acid. My ph is between 6.0 and 6.2. Room temp around 78 and rh 50%. Thoughts?
J
J