The white residue on the leaves of your dogwood is likely powdery mildew, a type of fungus. Powdery mildew is rarely a serious disease, so you likely don't need to spray a fungicide for it. It may be an indication that your dogwood tree is stressed (possibly simply from the transplanting last year.) Also keep in mind that dogwood is a native understory small tree, so it prefers partial shade.
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