Vascular Wilt Diseases
Treatment for Vascular Wilt Diseases
Vascular Wilt Disease for Oaks and Elms is an ongoing issue for our most prized canopy trees. We are dedicated to positively identifying each case, and providing the highest level of care. Treatments must be performed bi-annually to ensure ongoing health.
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Oak Wilt
What is Oak Wilt?
Oak Wilt is a deadly vascular disease impacting all varieties of Oak trees. Oak Wilt is especially deadly for Red Oaks. Oak Wilt is transferred from an infected tree in a couple of ways. The most common is through the roots. Root systems of trees bond together below ground and can easily transfer the fungus. The other main way is through sap beetles. Sap beetles are attracted to fresh wounds and cuts in healthy trees. As they move from tree to tree, they spread the fungus. For this reason, Oaks must be pruned during their dormant season. It is also important to remove diseased debris from your property.
What are the symptoms of Oak Wilt?
The first symptom of Oak Wilt is browning and curling of leaves high in the canopy. This quickly moves downward, and leaves fall to the ground. In Red Oaks, once the tree shows symptoms, the tree’s vascular system has been compromised and it will die quickly. In some cases of Oak Wilt in White and Bur Oaks, the tree can survive for 2-3 years after initial infection.
What is the Treatment for Oak Wilt?
Treatment varies, depending on the variety of Oak. Red Oaks must be treated preventively. Once a Red Oak shows symptoms, it is too late for treatment of the infected tree. However, nearby trees not showing symptoms should be treated before the disease spreads through grafted roots. White Oaks can be treated therapeutically after showing symptoms, provided less than 30% of the crown has been infected. Treatment consists of a systemic injection of a fungicide to the root flare. It is CRITICAL to treat these trees every two years. We send out reminder letters to make sure your tree does not miss a re-treatment.
Dutch Elm Disease
What is Dutch Elm Disease?
Dutch Elm Disease is a lethal vascular disease that wilts and kills all native species of Elm trees in Wisconsin and Minnesota. Dutch Elm Disease can spread through the root systems of trees. Dutch Elm Disease can also be spread through sap beetles that are attracted to fresh wounds and cuts in healthy trees. As they move from tree to tree, they spread the fungus. For this reason, Elms must be pruned during the winter months. Removal of contaminated branches and wood is required to prevent the spread to nearby healthy trees.
What Are the Symptoms of Dutch Elm Disease?
The first symptom of Dutch Elm Disease is the yellowing of leaves in the outer crown of the canopy. The leaves will fall to the ground. The disease will spread to nearby branches, eventually encompassing the entire canopy.
What is the Treatment for Dutch Elm Disease?
Preventative treatment is necessary for Dutch Elm Disease. Treatment consists of a systemic trunk injection of fungicide. It is CRITICAL to treat these trees every two years. We send out reminder letters to make sure your tree does not miss a re-treatment.
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