Cause Some trees will show symptoms of this nonparasitic problem year after year, regardless of the weather. Suggested causes have included high slat injury and heat but are not consistently associated with symptoms.
Symptoms Margins of leaves brown and curl during the summer.
Reference Hammerschlag, R., Sherald, J., and Kostka, S. 1986. Shade tree leaf scorch. J. Arboric 12:38-43.