Hello,

To address the issue of carpenter ants inside a tree in Michigan, it’s important to understand that while they don’t eat the wood, they do create nests within rotting wood, which can indicate a moisture and decay problem in the tree. More information at this link:

Carpenter ants nesting in trees and homes - MSU Extension

Here are some steps and considerations based on expert advice from educational sources:

Identify the Problem: Carpenter ants are often found in trees with decay, which they use to build their nests. They feed on dead insects and honeydew, not the wood itself. More information at this link:

Carpenter ants nesting in trees and homes - MSU Extension

Assess the Tree’s Health: Check if the tree is weakened by rot to the point of posing a risk of failure. The presence of carpenter ants doesn’t necessarily mean the tree is in decline, as they often nest in dead tissue without disrupting the tree’s health. You can consult with a local arborist for a more detailed onsite assessment and personalized advice. To find an arborist in your Zip Code go to this link: Find an Arborist (treesaregood.org)
More information at this link:

Question: Are Carpenter Ants Harmful To My Tree? | Purdue Extension Forestry & Natural Resources

Control Measures: Use dust insecticides containing pyrethroids, such as Sevin or Abamectin, labeled for use on trees. Apply the dust directly into the nest cavity.
More information at this link:

Question: Are Carpenter Ants Harmful To My Tree? | Purdue Extension Forestry & Natural Resources

Residual insecticide sprays can be applied to the tree trunk, the nest opening, and other surfaces where the ants travel. More information at this link:

Carpenter Ants in Trees | Yard and Garden (iastate.edu)

Avoid sealing tree cavities or treating tree wounds with wound dressings, as these treatments are unnecessary and won’t prevent decay or carpenter ant activity. More information at this link:

Question: Are Carpenter Ants Harmful To My Tree? | Purdue Extension Forestry & Natural Resources

Preventive Actions: Prevent further damage by addressing the sources of moisture and decay. This includes repairing injuries to the tree that may expose wood to moisture, such as from lawn mowers, pruning wounds, or environmental factors. More information at this link:

Carpenter ants nesting in trees and homes - MSU Extension

Monitoring: Keep an eye on the tree and the effectiveness of the treatment. Since control methods may not permanently rid a tree of carpenter ants, retreatment every year or so may be necessary. More information at this link:

Question: Are Carpenter Ants Harmful To My Tree? | Purdue Extension Forestry & Natural Resources

Remember, it’s always best to consult with a local arborist or pest control professional who can provide tailored advice and services for your specific situation. They can help you determine the best course of action to protect both your tree and property.

I hope this helps!