Boric Acid Ant Killer

How to Use Boric Acid to Kill Ants? DIY Ant Control Guide

Avatar of author Ismael Girard
Ismael Girard
min read

Are you looking for solutions to get rid of ants naturally? Boric acid is available at most hardware store and is great at killing ants! Simply mix it with sugar and heated water in a bottle, and spray around ant trails.

In this text, we'll investigate into the world of boric acid ant killers, exploring how they work, why they're effective, and how to use them safely.

What is Boric Acid?

Boric acid is a weak, monobasic Lewis acid of boron. Occurring naturally in minerals such as borax and boracite, it makes an excellent household cleaner and fungicide. But its potential doesn't end there. It has been used for pest control since the early 20th century.

What is the Effect of Boric Acid on Ants?

When ants eat boric acid, it disrupts their stomach and dries out their exoskeleton, leading to dehydration and impeded mobility. Simultaneously, in the long run, the accumulative toxic effect shuts down ants' nervous systems. Your goal is that ants carry the poisoned food back to their nest, so that the whole colony eats the solution.

💡 Boric acid-based pesticides possess a unique quality. They effectively eliminate pests without causing immediate harm to larger organisms or the environment.

Why Choose Boric Acid for Ant Control?

Boric acid offers three notable advantages: accessibility, affordability, and less harmful impacts compared to other commercial pesticides.

This DIY method helps homeowners rid their homes of ants effectively and gives them more control over application areas, ensuring it stays out of reach from children and pets. By using boric acid, you can target ant nests directly and minimize the risk of recurring infestations.

How to Create Ant Killer at Home?

image of a boric acid ant solution

Optimize boric acid into an effective ant deterrent with a simple recipe. Let's examine the materials needed, the preparation process and then guide you through careful placement of the homemade ant baits.

Ingredients and Material Needed

The fusion of the perfect home made ant bait consists of three simple ingredients:

  • Boric acid
  • Sugar (Boric acid works well with sugar to attract ants)
  • Water
  • Mixing bowl
  • Pot
  • Recycled containers

If you want, you could also use honey, maple syrup, powdered sugar, or even peanut butter — As different types of sugar may attract different ants.

Directions to Create the Ant Killer

  1. Prepare the Solution: Add 3/4 cups of sugar, 1/4 cup of boric acid, and 1 cup of water in a pot to create the liquid ant bait. Over medium heat, stir the mixture until the sugar and boric acid dissolve completely.
  2. Cool and Transfer the Solution: After cooling the solution, pour it into recycled containers and punch small holes for the ants to access.
  3. Position the Baits: Now, put these containers near areas where you commonly find ant trails. Be mindful not to interfere with the ant's pathway to make sure they come into contact with your baits. Ensure there's enough bait to attract ants.
  4. Monitor and Refill: Keep an eye on the ant activity around bait stations, which must be refilled every two weeks. Rest assured, it may take several days before you start seeing results (usually within a few weeks). The ants gradually transport the poisoned food back to their colony, effectively eliminating it over time.
  5. Continual Replacement: Replacing baits regularly may help ensure continuous ant control. Consider using another type of bait if the first doesn’t work.

⚠️ Maintain safety and caution while using any pest control products. Keep these baits away from pets and children, as they are toxic. Use just a little boric acid to avoid harming other wildlife.

Comparing Boric Acid to Other Ant Control Methods

Armed with the knowledge that boric acid is one of the best home made ant killers, let's contrast its effectiveness against synthetic chemicals and natural alternatives.

Ant Control: Natural Alternatives to Boric Acid

While many people prefer boric acid for ant control, some might prefer natural alternatives. Here, we discuss a few noteworthy alternatives compared to boric acid.

  • Diatomaceous Earth: Acting much like boric acid, diatomaceous earth eradicates ants by dehydrating them. But, keep in mind that although it is a natural substance, it still carries safety considerations similar to boric acid.
  • Essential Oils: Certain essential oils, such as peppermint and tea tree oil, deter ants and disrupt their trails. But, they typically lack in terms of large-scale eradication achieved by boric acid.
  • Vinegar: Handy for eliminating ant trails, vinegar, nonetheless, does not exterminate ant colonies, leaving boric acid the more robust and comprehensive option.

Ant Control: Boric Acid vs. Chemical Baits

Boric acid proves an exceptional solution amongst ant control methods. Unlike chemicals, known for their immediate impact yet accompanied by environmentally problematic aftereffects, boric acid offers a more sustainable and slower alternative. Understanding the distinct mechanisms of both approaches elucidates this comparison further.

  • Mechanism: Commercial ant killers like Terro typically execute ants directly upon contact, representing a quick solution to rampant ant invasions. But, boric acid operates discreetly, disrupting ants' digestive and nervous systems, eventually eradicating the entire ant colony.
  • Residue: Pesticides often leave harmful residues, threatening the life of other insects, animals, and in some cases, plants. Alternatively, boric acid results in minimal residue, its application limited to the targeted ant population.

Ant Control: Boric Acid vs. Borax

Boric acid and borax are both compounds derived from the element boron, but they have different chemical structures and uses. In fact, boric acid is found in borax.

Chemical Composition:

  • Boric Acid: Chemically known as H3BO3, boric acid is a weak, monobasic Lewis acid of boron. It often appears as white powder or colorless crystals that dissolve in water.
  • Borax: Also known as sodium borate (Na2B4O7·10H2O), borax is a salt of boric acid. It typically comes in the form of a white powder consisting of soft colorless crystals that dissolve easily in water.


  • Boric Acid: Commonly used as an antiseptic, insecticide, flame retardant, neutron absorber, or precursor to other chemical compounds. It's also used in the manufacture of glass and ceramics and in some medical applications for its antibacterial and antifungal properties.
  • Borax: Often used as a cleaning agent, laundry detergent booster, fungicide, preservative, insecticide, herbicide, desiccant, and in the manufacture of glass, ceramics, and enamels. It's also a component in slime recipes for its cross-linking properties that turn polyvinyl acetate (PVA) into a polymer.


The impact of boric acid as an effective ant killer is undeniable, offering a handy tool for curbing ant infestations at home. Remember this form of pest control disrupts ants' digestive and nervous systems, making it an exceptional choice against common household ants. But, larger ant species and particularly fiery fire ants might warrant assistance from pest control professionals. Additionally, consider using cornmeal as ant repellent in your garden or yard for a natural alternative that is safe for pets and children.

Table of contents
Heading 2

Frequently asked questions

How does boric acid affect ants?

Boric acid disrupts the digestive systems of ants, causing them to dehydrate and eventually die. This occurs because the boric acid interferes with their metabolism and dries out their exoskeleton.

Why is boric acid an effective pest control agent?

Boric acid is effective as a pest control agent because it eliminates ants without immediate harm to larger organisms or the environment. It acts slowly, disrupting the ants' stomach functions and nervous systems over time.

What are the advantages of using boric acid for ant control?

Boric acid is accessible, affordable, and less harmful than many commercial pesticides. It allows for precise application, reducing the risk of exposure to non-target species and minimizing environmental impact.