White leaves on pink dogwoods

I am trying to grow 5 small pink dogwoods in pots for resale in zone 6. The leaves have turned a whitish color and they have not grown. They are presently trying to put out new leaves at the end of the stems but the new leaves seem to curl up right away. What is wrong? Will they live and releaf if I strip them of all their leaves?
Submitted by BHGPhotoContest

Is the white on the leaves just a surface coating of white? If so, it may be powdery mildew, a fungus disease. Or are the leaves sort of bleached white? The bleaching could be sun scorch. Dogwoods are understory trees that grow best in partial shade.
Avoid stripping leaves at this time in the growing season. If new growth does appear, it will not have time to harden off properly before winter.

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