Red Oak tree Problem

Asked May 25, 2020, 7:01 PM EDT

I have a Ted Oak in my yard that has had an issue for the past few years. I don’t know if it is caused by fungus or insects. I saw on this site that it could be anthracnose but am not sure. I would like to know what I can do to help preserve this tree.

Carroll County Maryland

1 Response

The oak looks like it may be exhibiting symptoms of several fungal disease issues, such as oak leaf blister and anthracnose. It is not really anything to worry about and no treatment is necessary. There may also have been some damage in the bud. Below is some information.

Oak leaf blister is caused by a fungus, Taphrina caerulescens. Members of the red oak group are particularly susceptible to infection. Disease development is favored by cool, wet springs and, in years when such conditions occur, noticeable leaf deformity results. Heavy infections of red oaks mar their appearance but do not endanger the tree health. https://web.extension.illinois.edu/hortanswers/detailProblem.cfm?PathogenID=34
https://extension.umaine.edu/ipm/ipddl/plant-disease-images/oak-taphrina/

Anthracnose - is a foliar disease and can be prevalent during cool wet springs followed by warm weather. You may notice browning along the leaf veins. Anthracnose can affect oak, sycamore, ash, maples, etc. No control is necessary. Rake all fallen leaves to prevent overwintering spores. See our website for photos and more information http://extension.umd.edu/hgic/shade-tree-anthracnose-trees

Marian