Just found out that my Masdevallia datura and a few others imported last month are infected with black rot (based on symptoms). I know that these are very finicky pathogens, and I won't be able to kill them with normal fungicides. What do you guys use to treat pleurothallids and other humidity-loving orchids with black rot? What can be purchased on the American market and is NOT super expensive? Thanks! P.S. I've been growing orchids for several years, and have never had any black rot before. I'm a little worried!