What are the yellow spots on my apple trees leaves?

Question

What are the yellow spots on my apple trees leaves?

Answer 1

Signs of leaves turning yellow!

Answer 2

Cedar Apple Rust - Cedar apple rust causes pale yellow, pinhead-sized spots on the upper surfaces of apple leaves. These spots enlarge and turn bright orange on foliage and fruit. This rust originates on nearby cedar trees, forming swellings, or galls, on their bark. Junipers and hawthorns can also spread cedar apple rust to apple trees. Spray apple trees with fungicide when cedar galls are releasing spores in the early spring. Remove all red cedar trees within 300 yards of the apple tree. Apple varieties resistant to Cedar Apple Rust include Liberty, Nova Easygro, Novamac, Priscilla, and Redfree.

Source

http://gardening.yardener.com/SolvingApp...

Answer 3

John is most probably right about the Cedar Rust but to be 100% take a sample of your leaves to your county extension office.  Trained volunteers there can better identify the problem and it's free.