Ash leaf with scorch symptoms. Many times leaves will begin to show scorch symptoms at the margins followed by interveinal scorching. Younger leaves are normally affected before older leaves.
Plane tree leaves with severe summer leaf scorch. Both leaves show the characteristic intervienal necrosis, common in most shade trees with large leaves.
Maple leaves with scorch symptoms caused by an iron deficiency. Scorch due to iron deficiency can often be confused with summer leaf scorch. When this deficiency is the cause of the scorch, addition of a chelated iron compound in addition to irrigation management is the recommended control. See Utah plant disease bulletin 45 (iron chlorosis).
