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Writer's pictureAndy Hemmer

Diatomaceous Earth For Carpenter Ants

Updated: 4 days ago


black carpenter ant

Carpenter ants are notorious for causing damage to wooden structures in homes, furniture, and outdoor areas. While they don’t eat wood like termites, their habit of tunneling and nesting within it can weaken wooden structures over time. If you’re dealing with a carpenter ant infestation, diatomaceous earth (DE) offers a safe, natural, and effective solution to get rid of carpenter ants without relying on harmful chemical pesticides from a pest control company.


In this comprehensive guide, we’ll discuss how diatomaceous earth works against carpenter ants, why it’s a preferred pest control method, and step-by-step instructions to use diatomaceous earth to kill ants effectively.



 


What Are Carpenter Ants?

illustration of carpenter ants

Carpenter ants are large ants that build their nests in damp or decayed wood. Unlike termites, they do not consume wood but carve tunnels and galleries to create living spaces, often leading to structural damage.


Common Signs of Carpenter Ant Infestation


  • Wood Shavings: Sawdust-like material near wooden structures.

  • Rustling Noises: Faint sounds within walls or woodwork.

  • Ant Trails: Regular paths of ants moving to and from food sources.

  • Damaged Wood: Hollow or weakened wood, often with smooth tunnels inside.



 


Why Use Diatomaceous Earth for Carpenter Ant Control?

diatomaceous earth

Diatomaceous earth is a naturally occurring, non-toxic powder made from the fossilized remains of diatoms, a type of algae. It is an eco-friendly alternative to chemical pesticides and is safe for use around humans, pets, and the environment when applied correctly.


How Diatomaceous Earth Works


  • Abrasive Action: DE’s microscopic particles are sharp and abrasive to insects. When carpenter ants come into contact with DE, it damages their exoskeletons.

  • Dehydration: The damaged exoskeleton leads to moisture loss, causing the ants to dehydrate and die.

  • Long-Lasting: DE remains effective as long as it stays dry, making it a durable solution for pest control.



 


Steps to Use Diatomaceous Earth for Carpenter Ant Control


1. Identify the Problem Areas

Locate areas where ants enter your home, carpenter ant trails, entry points, and nesting areas. Common locations include:


  • Wooden beams or structures

  • Crawl spaces and attics

  • Baseboards and window sills and window frames

  • Outdoor logs, stumps, or mulch


2. Choose the Right Type of DE

Use food-grade diatomaceous earth for indoor applications to ensure safety around people and pets. Industrial-grade DE can be used for outdoor areas or larger infestations.


3. Prepare the Area


  • Clean the affected area to remove debris, wood shavings, or food particles that may attract ants.

  • Dry any damp areas, as carpenter ants thrive in moisture.


4. Apply Diatomaceous Earth


  • Direct Application: Sprinkle a thin layer of DE directly along ant trails, near entry points, and around the nest. Use a duster or a small brush for precision.

  • Perimeter Barrier: Apply DE around the perimeter of your home, including doorways, windows, and foundation cracks, to prevent ants from entering.

  • Wood Treatment: If possible, dust DE into cracks or crevices in wooden structures where ants may be nesting.


5. Monitor and Reapply

  • Check treated areas regularly and reapply DE after heavy rains or cleaning, as moisture reduces its effectiveness.

  • Monitor ant activity to ensure the infestation is under control.



 


Additional Tips for Using Diatomaceous Earth Against Carpenter Ants

carpenter ant

  • Combine with Baiting


    • Use DE alongside baiting methods like boric acid and sugar to attract ants to a toxic food source, ensuring that the entire colony is affected. You can also repel them by using essential oils.


  • Seal Entry Points


    • After applying DE, seal cracks, holes, or gaps in walls and wood to prevent new infestations.


  • Reduce Moisture


    • Fix leaks and ensure proper ventilation to eliminate the damp environments carpenter ants prefer.


  • Keep DE Dry


    • Reapply DE as needed in humid or wet conditions, as its effectiveness diminishes when wet.


  • Use DE Safely


    • Wear a mask while applying DE to avoid inhaling the fine powder, which can irritate the respiratory system.



 


Benefits of Using Diatomaceous Earth for Carpenter Ant Control


  • Non-Toxic: Safe for humans, pets, and the environment.

  • Eco-Friendly: A natural alternative to chemical pesticides.

  • Long-Lasting: Effective as long as it remains dry.

  • Multi-Purpose: Can also be used to control other pests, such as termites, roaches, and fleas.



 


Preventing Future Carpenter Ant Infestations


Maintain Wooden Structures


  • Keep wooden surfaces dry and repair any water damage promptly.

  • Use treated wood for outdoor structures to deter ants.


2. Eliminate Food Sources


  • Store food in airtight containers and clean up crumbs or spills promptly.

  • Remove outdoor debris like fallen branches, logs, and mulch piles.


3. Regular Inspections


  • Periodically inspect your home for signs of carpenter ant activity, especially in damp or wooded areas.



 


Conclusion


Diatomaceous earth is an effective and eco-friendly solution for controlling carpenter ants. By using DE to target their nests, trails, and entry points, you can eliminate infestations without relying on harmful chemicals. Combined with preventive measures like sealing entry points and reducing moisture, diatomaceous earth can help keep carpenter ants—and the damage they cause—at bay.


Have you tried diatomaceous earth for pest control? Share your experiences and tips in the comments below!


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