Yes, that is an awesome link, bookmarked myself. BUT I don't see any picture that looks right for this. I still stand by the RO water as the issue and loss of micronutrients. I had the problem with RO and stopped RO and the problem went away. It was diagnosed as rust fungus by several. It is gone from my garden since I went to straight tap water. That is the ONLY change and that is why I attribute the appearance to the absence of balanced micronutrients in the water.
WashougalWonder Reviewed by WashougalWonder on . Mg deficiency or Rust fungi!! Alright lets start by saying i started noticing this on one of my plants about 2 weeks ago. At the time i was give a full dose of FF Grow Big and Big Bloom. I water with R/O water and everything is always buffered to 6.5-6.8 pH. Runoff is 6.2-6.5 pH. Last weekend I up potted everything to 3 gal pots using FFOF with 20% perlite added. Tuesday i noticed that it had moved from just the one plant now to almost all. At first i thought it was a Mg def. so I added Cal-Mag 3 days ago, but now Rating: 5