On the assumption that the potting medium is consistent between the plants,
> meaning that the same watering regimen is good for all, and it's been 6
> months since repotting, I would think it's safe to rule out root issues. >
> I'd speculate that you're seeing a bacterial or fungal infection that
> originated from water standing in the leaf axils - the little "cups" they
> make where they attach to the plant.
>
> You're probably going to lose those leaves altogether, but if kept dry,
> especially at night, I would not anticipate further issues.
>
> --
>
> Ray Barkalow - First Rays Orchids -www.firstrays.com
> Plants, Supplies. Books, Artwork, and lots of Free Info!
>
> >I have seven phals. All in the same place and all doing extremely
> > well, except for one.
>
> > This one is losing two large leaves. The are not the oldest leaves,
> > which is what concerns me most. It has seven leaves. Four are very
> > large (one is almost all yellow and another is starting to turn
> > yellow). The remaining three leaves are smaller and at least one is
> > relatively new.
>
> > This plant has already bloomed twice. Last time it was growing a
> > flower spike I repotted it with all new bark and moss in a slightly
> > larger pot. That was about 6 months ago. It bloomed beautifully and
> > did very well.
>
> > All the other phals are doing great. One is going to bloom for the
> > third time and two others are in full bloom now.
>
> > Is there anything I can do to save this plant?
>
> > Thanks
Thanks for the reply Ray. It was a reasonable guess, but actually I'm always very careful not to get the leaves wet.