Two of my phals are in full bloom. Both appear very healthy with large
glossy leaves, very green roots, etc.

However, the minute one of them broke into bloom, I noticed large
yellowish spots on its leaves. Nearly all the leaves have them, the
healthier the leaf, the more spots.

I can't imagine what is causing this. I haven't changed the way I treat
the plants, have not left water standing on the leaves, etc.

Anyone got any ideas? Will it spread to the other phals?

Norma in Ottawa