Try spraying with Neem. I spray my Zygos and Oncidiums - such as Shari Baby - several times a year.
Neem is a natural oil from the neem tree, whihc has been used for centuries by Asian Indian people.
It is a mild pesticide and fundgicide.
It won't cure the already exisiting black spots, but will reduce the number of new spots on newly emerging leave greatly.
Good Luck ~
Maryanne
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