Curled and Spotted Leaves on Dogwood

I have several dwarf red twig dogwoods in my yard (planted about 5 years ago), and every year the leaves curl and develop brown spots. Aside from that, they seem healthy. The leaves don't actually drop until autumn, when all other deciduous plants start losing leaves. What is causing those brown spots, and is there anything I can do about it?

Anthracnose is a common problem on dogwoods. Fortunately the strain of this fungus that attacks our dogwoods is not lethal like the one killing the flowering dogwoods of the south. Rake and destroy the fallen leaves to reduce the risk of future infection. If the problem continues and you want to reduce the symptoms treat with a fungicide, such as Daconil, labeled for treating anthracnose on dogwoods. Spray just before the flowers are fully expanded. Repeat two or three times in wet years. And as always read and follow all label directions carefully.