Why Are the Oak Trees Dying?

This question is most asked these days in the Northern suburbs of Chicago. Residents tree awareness is especially keen these days it seems since the area has lost hundreds of thousands of Ash trees due to the Emerald Ash Borer. So, what is causing the death of so many Oak trees? The answer is complex, a number of factors. The comprehensive answer is a combination of diseases, weather phenomena and insects. Are there diseases that affect only one species of Oak trees? Yes, Burr Oak Blight (BOB). What diseases affect other Oak species, such as White Oaks and Red Oaks? Oak Wilt, a vascular fungus disease that kills many White and Red Oaks. This disease is very similar to Dutch Elm disease since it’s primarily spread by bark beetles and /or adjacent trees roots grafting. It appears that the Red Oaks are more susceptible than the White Oak varieties. There is no cure for Oak Wilt. The best prevention for this deadly disease is frequent inspection of suspect Oaks. If disease is identified and confirmed, remove the infected tree. Root pruning adjacent trees may prevent root grafting of diseased trees to healthy trees. Are there other factors / insects / diseases afflicting Oak trees? Yes, the extreme weather the Mid-West has experienced over the last decade, combining excessively wet, dry, hot and cold weather spells has caused significant stress on the Oak species. How do I  properly diagnose the condition of my Oaks? Contact a certified Arborist that is trained and experienced in dealing with the various Oak diseases.