Knowledgebase
Curling leaves on you pin oak #752951
Asked May 30, 2021, 1:02 PM EDT
Hennepin County Minnesota
Expert Response
This may well be anthracnose. Overwintering fungi is spread by rain and wind, and cool wet springs facilitate this disease. Once the weather becomes warm and dry, the condition should be controlled. I'm attaching an article which speaks to your question and talks about the possible causes of leaf curl on oaks. The article discusses identification of the problem and how to treat it.
https://apps.extension.umn.edu/garden/diagnose/plant/deciduous/oak/leavesdeformed.html
For a definitive diagnosis, bring a sample to the University of Minnesota's plant disease clinic - https://pdc.umn.edu/