I am dealing with both an aerides and a sedirea that have this problem and they are planted in lava rock and kept on the dry side. Water must have gotten into one of the lower leaves and started the process. In both cases, I caught it before it rotted the center but whether they will survive, I don't know. I have been spraying the roots of my angraecums and neo falcata and I guess some of the water has been landing on these two as well. With the cooler house temps...oops.
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