Hi, I recently picked up a dendrobium "Green Lantern," although the two largest canes seem very healthy, a shorter one has started to look sick. It's bottom two leaves turned yellow and fell off, and a black, moldy looking substance is appearing on the cane. Also, the cane itself is a much lighter shade of green than the others.
I was planning to repot this guy soon (observing what appears to be the start of mold on the bark) and was wondering if this cane was actually sickly, and if so whether they was anything I could try to do to save it?
Many thanks
Will