Spots on the leaves of Oncidium alliance orchids are an almost universal issue. They often may be due to minor and very common cultural issues, and some plants are much more susceptible than others. Usually more of a cosmetic issue than a health concern, and your plant looks quite healthy for a home-grown C.M.F. Examine very closely for any infestation issues, and keep cold water off the leaves. Otherwise, I wouldn't worry and I wouldn't change anything. Spots just happen with Oncids.
|