Gum Tree Leaf Diseases

Cercospora is a fungal spot disease that produces dark brown bordered angular to circular spots 2 to 10 mm in diameter on both sides of leaves.
Gum tree leaf diseases. Leaves turn yellow and drop and it is common to see eucalyptus trees dropping their branches as the disease takes hold. The symptoms include raised black spots with ragged edges on leaves. When canker attacks the trunk the result will eventually be the eucalyptus trees splitting along their trunks or if the canker girdles the trunk strangling the eucalyptus tree. These leaf spot diseases affect all shade trees including the black gum tree according to the university of illinois extension.
Leaf spots multiply at the end of the growing season. Blights might be caused by drought conditions but little is known about these types of diseases of the sweet gum. Phytophthora basal rot affects the sweet gum tree and also rhododendrons certain firs and maples beeches and dogwoods.