Dendrobium - Fungus? Spots, leaves falling off - 7 pics

[admsteiner]

Hey guys,

My dendro (Love Memory Fit) has been losing leaves. They turn yellowish and have black spots on them before falling off. These are on the canes which have not yet flowered.

I should note that my oncidium has been doing just dandy, in a smaller pot. No wilting or discoloration of any leaves.

Thinking it may be the NYC cold, I moved it off the windowsill. Thinking it may be fungus I used a soapy fungicide on the leaves (which doesn't seem to have stopped the problem).

Thinking something was wrong with the roots, I depotted it and took a look at the root system, which has almost filled the pot since I transplanted it in May.

Here are some pictures of the leaves and roots. Note that in one pic there's a bluish/greenish substance on a root, not sure where that came from:

Leaves: