Oak Tree Leaves Bubbled And Misshapen

Q: What do you think is wrong with my oak tree? The leaves are bubbled and misshapen. It looks like it has some systemic problem going on. 

A: This is a fine description of oak leaf blister. The disease is favored by cool, moist conditions during budbreak and in the early stages of leaf development. It doesn’t seem to damage trees permanently. Given a dry spring next year, you may not see it at all. Be sure to rake and remove leaves in fall.