Old dendrobium black spots etc.
I noticed today that my very old dendrobium has some strangeness going on with one of its leaves. Purchased in 1997 and has bloomed with tons of flowers over the years. In the last few years, it went through some orchid hell (me) but this year looks to be revived. It sent up a new flower shoot late last month or so but lately that growth seems to have slowed down. Today I noticed one leaf sort of yellow on topside. I removed it and when I looked closely, it had some strange stuff on underside. photo explains better. Any thoughts?
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