Septoria cornicola is another fungus affecting dogwoods.
11+ Brown Spots On Dogwood Leaves. On severely stressed trees, drying. It appears on dogwood leaves in late summer, with purplish leaf scorch affects dogwood when cultural needs are not being met.
Dogwood shrubs, such as red twig dogwoods, are not to be confused with dogwood trees. This is the second instructable i have done in regards to identifying trees. There are lots of brown spots on the leaves of my sugar maple this spring.
Leaves have dry and browning edges.
Bark sloughs off around holes on the trunk or branches. Give them water and they perk right back up. Manual shaping can be done if desired, though. Young leaves that are infected are commonly distorted by cupping and curling.