I just dealt with black rot with the cattleyas and removing infected parts and swabbing the cut and the nearby parts of the plants with alcohol for a few days seems to have stopped the rot. Too bad I kept forgetting to treat the nodosa...it succumbed. I grow a few vanillas now and I learned the hard way that they don't like cool, damp, drafts (or water in the new growth) but will easily recover once the rot is halted. When I spray now, during the winter, I have to be careful to either cover the new growth or only spray below it. I have stopped all my rot problems by removing any rotted parts, treating with alcohol for a few days (cinnamon in addition won't hurt), and keeping the afflicted orchid very dry for a few days (with vanilla, the aerial roots will have to remain moist, though, or they die...although the noID vanilla grew all new roots when I first recieved it. Maybe warmth would compensate?). If it is rotting at the stem, these things don't really need much soil if you take care of the aerial roots. I have two in three inch pots, climbing up towel-covered posts of my shelf, one just wired to the shelf and my first in a pot of lava rock, sand, vermiculite, perlite and bark. All four seem happy. Good luck!
Leafmite
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