The Threat of the Two-Lined Chestnut Borer to Oak Trees in Davison

A question I am often asked is, “I have several dead branches on my oak tree. Could it be suffering from Oak Wilt Disease?”

While Oak Wilt disease is a concern in Davison, Michigan it is much less common compared to an insect known as the two-lined chestnut borer (Agrilus bilineatus). The two-lined chestnut borer (TLB) is more widespread in Genesee County than Oak Wilt.

In Davison, more oak trees are facing a rising threat from TLB, a beetle related to emerald ash borer that can cause significant damage to oak populations. This destructive pest, notorious for impacting hardwood forests, has now become a serious concern in landscape oak trees.

The TLB larvae tunnel beneath the bark of oak trees, burrowing into the cambium layer, where they interfere with the flow of water and nutrients. This disruption leads to stress, weakening, and eventually the death of the tree. Although the pest typically targets already stressed trees, the increased frequency of droughts and other environmental factors are making oak trees in Davison more vulnerable.

While TLB outbreaks have occurred in various parts of Michigan, their impact in Davison is particularly alarming. Oak trees, which play a vital role in the local ecosystem are being severely impacted, threatening both biodiversity and wildlife habitats. Beyond their ecological significance, oak trees provide shade, improve air quality, and enhance the beauty and value of a landscaped property.

To combat this infestation, experts recommend prompt actions, such as insecticide treatments, improving tree health with fertilization, and removing deadwood. Tree owners should carefully monitor their oaks for signs of damage, such as thinning canopies, dying branches, fallen dead limbs, and bark discoloration.

To schedule an arborist inspection of your oak trees contact Owen Tree & Lawn Care at 800-724-6680.