Many area oak trees have been dropping their leaves earlier than usual, and experts are warning of the possibility they may be suffering from Bur Oak Blight. The fungus, seen mostly in bur oak trees but which can also be found in swamp white oaks, causes the leaves to begin to brown between late July and early August. The Iowa Department of Natural Resources (DNR) says that once an oak begins to show symptoms of the condition, it will continue to get worse each year. This could result in branches dying, and in some cases the death of the entire tree. However, it is unknown whether Bur Oak Blight is the sole cause of tree death or if it makes the oak more susceptible to other diseases or organisms. There are limited ways to manage the disease as the fungus typically survives on the dead leaves left hanging on the branches. Fungicide treatments have shown some promise, but this is recommended only after symptoms have appeared. If Bur Oak Blight is suspected, the DNR recommends getting a proper diagnosis before treatment decisions are made. Samples can be sent to the Iowa State University Plant Diagnostic Clinic for testing. There is a $20 fee for submission. More information and details on how to send in a sample can be found by following the link below.
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https://hortnews.extension.iastate.edu/pidc/plant
