Just received delivery of an Oncidium Sandrinho. The appearance of the leaves is worrying me, though. There are lots of rings of dark brown spots on nearly all the leaves on the plant. The affected areas are a slightly yellower color than the rest of the leaf.
A few photos:
Apart from this spotting, the plant appears to be in fine health - it's currently in bloom with a total of 6 spikes.
Any ideas what this spotting is, and what I should do about it?
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