I noticed white pitted areas on a phal leaf but didn't pay much attention. I repotted several phals this summer and although I used new razor blades removing some dead stuff, I didn't clean my hands between plants. I think by roughly removing dead roots and old parts of plant, I must have contaminated them all. Now 6 plants have the same whitish-pitted areas on the leaves and I probably will have to toss them all. Any remedy at all? Hard lesson to learn.