I work at a Gardening Supply. We've had good luck with previous orchid orders, but nearly every plant in the last order came with a strange fungus. The leaves start by wilting and turning yellow, from the bottom of the plant up. Eventually, a strange round pattern develops encircled by another round pattern. Very strange. Any advice on diagnosis and treatment?
I can't remember off hand what it is but I do know the someone else on this board posted a similar problem. I can't remember if it was ringspot or not...but it looks like it might be bacterial. Either way the chances of the plants surviving is not very good. Anyway, try searching through some old posts to see if they found a solution before the plant died....Good luck!