When Black Rot was attacking my cattleyas, I would remove/discard the infected growths on a catt, then disinfect all but the roots with alcohol. I did this twice a day to each cattleya that I caught in time and was able to stop the spread of the black rot and save them. (Too bad I didn't notice it earlier and save the others.) I also was able to stop a fast moving brown rot and save another cattleya, by doing the same thing. Now, I am trying this with a newly bought miltona that was infected with brown rot in all but one growth. So far, the growth seems okay.
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