Hmmm could it be the Tanins from the tree? Tannins are a natural antifungal. Could be the reason. Especially in such humid conditions. ANd I believe that Quercus virginiana is fond of wetlands, adding extra dampness to the surroundings of any orchid who chooses to live on it.
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All that is gold does not glitter,
Not all those who wander are lost;
The old that is strong does not wither,
Deep roots are not reached by the frost.
-J.R.R. Tolkien, LOTR, Fellowship of the Ring
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