Does Boric Acid Kill Cockroaches?

cockroach in the bathroom

Got a roach problem? Boric acid might be your new best friend. It’s not as harsh as some bug killers and is easy to use.

This powder messes with roaches’ guts and shells, making it a smart choice for your cockroach war plan. We’ll be the first to say that DIY methods aren’t always the most effective, but we understand wanting to rule out all your options. 

So keep reading to learn more about how boric acid can help you get rid of those pesky cockroaches.

Key Takeaways

  • Boric acid kills cockroaches by attacking their digestive and nervous systems, leading to dehydration and eventual death.
  • Effective use involves crafting baits, applying the acid to cockroach-traffic areas, and maintaining the treated area’s cleanliness.
  • Recognizing signs of infestation, like droppings, egg cases, and a musty smell, can help tackle the problem early.
  • Preventing future infestations requires cleanliness, eliminating water sources, sealing entry points, and professional help for severe cases.
  • Professional pest control offers tailored solutions for persistent or complex infestations, utilizing specialized methods like Insect Growth Regulators and granular baits.



When boric acid is used, it is a potent agent against adult cockroaches, targeting their digestive and nervous systems. However, it does not get rid of roach eggs.

Let’s dig into how this substance takes down these pesky critters.

  1. Ingestion: The cockroach unknowingly eats the boric acid along with food particles or during grooming.
  2. Dehydration: Once inside, boric acid is a desiccant, disrupting the roach’s digestive system. Eventually, it leads to a severe loss of water content in the body.
  3. Death: The dehydration progresses, and the roach cannot recover, eventually leading to its demise.


Besides crafting irresistible and enticing baits, proper preparation and application of boric acid are essential to kill roaches effectively.

Preparation Checklist

To ensure your safety and the effectiveness of the treatment, here are some essential steps to prepare properly:

  • Purchase pure boric acid powder.
  • Wear safety gloves and a mask to prevent inhalation.
  • Keep pets and children away during application.

Application Methods

To effectively manage a cockroach infestation in your home, follow these targeted application methods focusing on their favorite hideouts and pathways:

  1. Identify cockroach traffic areas such as crevices, baseboards, and behind kitchen cabinets.
  2. Lightly dust boric acid in these areas using a small brush or a duster. Avoid heavy application to prevent repellence.
  3. Seal potential entry points with caulk to limit cockroach access.
  4. Regularly clean countertops and floors to eliminate other food sources.
  5. Reapply boric acid every few weeks or as necessary since its effectiveness can diminish.

Crafting Effective Borax Baits

Cockroaches are attracted to various household foods, which can be used to create effective boric acid baits. Here are two sets of ingredients you can choose from:

IngredientsPreparation TimeNotes
Boric acid, Peanut butter5 minutesIdeal for tight spaces. Peanut butter acts as a strong attractant. Apply dime-sized amounts near hiding places.
Boric acid, Sugar, Flour10 minutesSugar lures roaches, while flour makes the mixture stick. Great for scattering behind appliances.

Bait Recipes

Here’s a step-by-step guide tailored for your DIY cockroach control:

  1. Mix boric acid with the chosen attractant, keeping the ratio high enough to ensure lethality while enticing enough for roaches to consume the bait.
  2. Place baits strategically, including under kitchen cabinets and near baseboards, where cockroaches frequent.
  3. Ensure that these baits must remain out of reach of children and pets.


Cockroach infestations are common in Louisiana. So, early recognition of the signs can help address the problem before it escalates.

Here’s a closer at the signs for spotting these unwelcome visitors:

DroppingsCockroach droppings can be found in kitchen cabinets or near food sources.
Egg CasesLook for oval-shaped roach egg cases or ootheca in secluded areas, such as under furniture or corners.
OdorA musty or oily smell can signal a sizable infestation from chemicals in the droppings.
Live RoachesSpotting live cockroaches during the day can mean their hiding spots are overcrowded.
Dead RoachesFinding dead roaches around the home, particularly in areas like the kitchen or bathroom, is a red flag.
Smear MarksIf water is abundant, cockroaches leave behind brown smear marks as they move.


While boric acid effectively kills cockroaches, maintaining a cockroach-free home requires proactive measures to prevent future infestations.

So, at LaJaunie’s Pest Control, we recommend you follow these tips to prevent future infestations:

Maintain Cleanliness

  • Kitchen Hygiene: Wash dishes daily and regularly clean behind stoves and large appliances.
  • Vacuum Regularly: Ensure floors are free of crumbs and debris, paying particular attention to dining and kitchen areas.
  • Food Storage: Avoid leaving food out in the open. Store food in sealed containers and limit eating areas to reduce crumbs and spills.

Eliminate Water Sources

  • Fix Leaks: Inspect and repair any leaking pipes, faucets, and hoses regularly to deter other pests like waterbugs and palmetto bugs.
  • Manage Exterior Water: Clear gutters and downspouts to prevent water pooling near your home’s foundation.

Seal Entry Points

  • Cracks and Gaps: Inspect and seal any cracks or openings around doors, windows, and wall voids.
  • Cover Vents and Drains: Install covers on vents and drains to deter entry without hindering ventilation.

Manage Waste and Exterior

  • Garbage Disposal: Remove trash daily, storing it in containers with locking lids until collection day.
  • Garage Security: Check the seal of your garage door for gaps that might offer entry to pests.

Utilize Other Ways

  • Baking Soda Bait: A common method involves mixing baking soda with a bait (such as sugar) to attract cockroaches. Place this mixture near cockroach hideouts.
  • Diatomaceous Earth: To use as a repellent, sprinkle diatomaceous earth in areas where cockroaches are likely to travel, such as inside closets.


Sometimes, despite your best efforts, you may find that boric acid isn’t the silver bullet they’d hoped for in the war against cockroaches.

In specific scenarios, it’s time to hang up the DIY hat and dial in the cavalry – that’s right, the pest control professionals.

Whether you’re in New Orleans or Baton Rouge, seeking expert help should be easy. For immediate intervention for a severe infestation, let Lajaunie’s cockroach control specialists tailor a solution that’s right for your home.

For more information about the areas we service, visit our location page.