The Invasion of Oak Wilt in Ontario: A Growing Concern

Oak Wilt

Oak wilt, a devastating tree disease caused by the fungus Bretziella fagacearum, is increasingly becoming a significant concern in Ontario. This disease, which primarily affects red oaks, can lead to tree death within a single season, posing a serious threat to our local tree service and the overall health of our forests.

The spread of oak wilt in Ontario is alarming. The disease, which was once confined to specific regions, is now being reported in various parts of the province. The rapid spread of this disease is largely due to the transportation of infected firewood and the activities of sap-feeding beetles that carry the fungus from tree to tree.

Red oaks are particularly susceptible to oak wilt. Once infected, these trees can die within a few weeks to six months. The disease causes the tree’s water-conducting vessels to plug up, preventing water and nutrients from reaching the branches and leaves. This results in wilting, bronzing, and eventually, the death of the tree.


Preventing the spread of oak wilt is crucial to maintaining the health of our forests and the services provided by local tree companies like Kingston Tree Service. One of the most effective prevention methods is to avoid wounding oaks from April through July, when they are most susceptible to infection. If trees must be cut during this high-risk period, it’s important to immediately apply water-based paint or shellac to the cuts. This prevents sap-feeding beetles, which are attracted to the sap of freshly cut trees, from infecting the tree.


In addition to prevention, there are also treatment options available for trees infected with oak wilt. These include injecting the tree with a fungicide to kill the fungus and using a technique called vibratory plowing to sever the root connections between trees, preventing the spread of the disease.

As a leading tree service provider in Kingston, Ontario, we are committed to combating the spread of oak wilt. Our experienced arborists are well-versed in the latest prevention and treatment methods, ensuring that your trees receive the best possible care.

Take action

If you suspect that your trees may be infected with oak wilt, it’s important to act quickly. Contact a local tree service like Kingston Tree Service for a consultation. Our team of tree experts can assess the health of your trees and recommend the best course of action.

Remember, maintaining the health of our trees is a shared responsibility. By being vigilant and taking the necessary precautions, we can help prevent the spread of oak wilt and preserve the beauty and health of our forests.

In conclusion, the invasion of oak wilt in Ontario is a growing concern that requires immediate attention. With the right prevention and treatment methods, we can protect our trees and ensure the continued health of our forests. If you need assistance with tree care or suspect oak wilt, don’t hesitate to reach out to Kingston Tree Service at 613-777-6441 or use our website contact form. We’re here to help!

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