Experts and BHG readers answer.
White specks on underside of tri-color beech tree leaves
Thanks for writing. Without being able to see your tree in person, I can't say for sure what's going on. The white specks could possibly be an insect infestation (such as mealybugs, whiteflies, or scale insects), they could be the sign of a disease (such as powdery mildew), or they could be harmless.
Because someone would really need to see the specks in person to make a diagnosis, I'd bring a couple of the affected leaves to the folks at your Summity County cooperative extension office. Contact them at http://summit.osu.edu/