That one leaf looks pretty bad. Natural die-back generally starts with a uniform yellowing, and then it browns completely and dries out. That leaf looks like it is the victim of some form of fungal attack (if it was purely from overfertalization there probably wouldn't be brown spotting). I would take care when putting it next to your other orchids. I had one like that in my collection and it was outside, a good distance away from the others. One good rain and 4 other plants had the disease within two weeks. I would be inclined to spray, cut the leaf off, or isolate the plant and just watch it for a couple weeks to see what happens (if it spreads to the other leaves).
Last edited by cnarciso; 06-08-2010 at 05:25 PM..
|