I can't see a problem with the first one (the oncidium as Sonya has identified). This is normal for oncidiums so I wouldn't worry about that one.
---------- Post added at 08:22 AM ---------- Previous post was at 08:20 AM ----------
Quote:
Originally Posted by msadrienne
The next two were already returned, but I want to know what happened so I can prevent it on my other orchids. These two are phal's. What causes this leaf change? I know it can't be good.
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The second picture looks like sunburn. I can't see what's wrong in the first phalalenopsis picture.