How Effective Is Boric Acid Against Cockroaches?

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Boric acid comes in a white powder that is known for killing cockroaches. But how effective is boric acid against cockroaches? Though it has been used for years as a natural cockroach killer, boric acid is becoming more popular on the internet as a go-to solution for getting rid of these pests. There are different ways to get rid of roaches by using boric acid as the primary product. 

You can apply it in various ways, but it is important to do so correctly to maintain its potency. If it is not applied correctly, the cockroaches may become resistant to it, and it will not be as effective as bait. This white powder has been fairly effective against troublesome insects like ants and termites. When it comes to roaches, though, the effectiveness of boric acid is lethal.

So, how effective is boric acid against cockroaches? Find out below in this guide

What is Boric Acid Powder?

Borax compounds for goldsmith specialist in gold

Boric acid is a white, odorless powder. Boric acid is a powder made from boron and water. It is considered a natural product, so it does not have harsh chemicals. Additionally, it effectively kills cockroaches without using harsh chemicals or an offensive odor.

Boric acid is a white powder in a bottle and is ready to use straight out of the packaging. It has no harsh chemicals or odor. So it is a popular choice for people looking for an effective way to get rid of cockroaches.

How does boric acid work to kill roaches?

The cockroach must crawl through the substance for boric acid to work effectively as a roach killer. The powder will stick to its legs and body when a cockroach walks through boric acid.

The cockroach will then ingest it when it cleans itself, and the boric acid will work to kill the cockroach. It works by affecting their nervous and digestive systems, which eventually causes them to die.

You can use Boric acid can as bait and traps. Or mixed with water to create a spray.

Does boric acid kill German and American cockroaches?

Boric acid can kill roaches because it poisons their digestive system. The roaches will stop eating and eventually die.

When boric acid comes in contact with the exoskeleton of a cockroach, it causes the cockroaches to itch. It makes them scratch themselves and damages their exoskeleton.

Does Boric Acid Kill Cockroach Eggs?

Australian Cockroach of the species Periplaneta australasiae laying eggs

Although boric acid is a common roach killer, it does not kill eggs. The boric acid will dehydrate the cockroach and eventually kill it when ingested. However, if the roach does not consume the eggs, they will hatch and produce a new generation of cockroaches.

Boric acid is effective against cockroaches because it kills the nymphs that walk over the powder. Nymphs are the juveniles of cockroaches, and they are very susceptible to boric acid.

Apply it in areas where cockroaches like to hide and lay their eggs, such as cracks and crevices. As a result, this makes boric acid a powerful tool in combating a cockroach infestation.

Can Boric acid be used to kill cockroaches in my house?


Cockroaches will ingest boric acid when they come into contact with it. The boric acid will kill them within three days. Boric acid is a common household item used to get rid of these pests.

It works when ingested or when it comes into contact with the skin of the cockroach. If the poison has to travel through the outer shell of the cockroach, it will take a longer time to work.

Boric acid is a natural chemical that can be used to kill cockroaches. It works by affecting the cockroach’s nervous system, temporarily paralyzing it and causing it to flip onto its back.

The cockroach will then die from dehydration. Boric acid is a poison to cockroaches because it destroys their digestive system. Without the ability to process nutrients, they quickly die.

How Effective is Boric Acid Against Cockroaches Problem?

Selective focus of a bottle of pure boric acid chemical compound beside a petri dish with solid crystalline powder substance. White Chemistry laboratory background with copy space.

When cockroaches ingest boric acid powder, it interferes with their nervous and digestive system. And they eventually die. It is a slow process, but it is very effective in getting rid of cockroaches.

It is effective because cockroaches eat almost anything, including Borax (a boric acid compound). When they ingest the Borax, it will kill them over time.

As it turns out, boric acid is a very effective means of getting rid of cockroaches. To maximize effects, boric acid can be sprinkled on food so that more cockroaches will get in contact with it and die. Cockroaches eat dead cockroaches after ingesting boric acid, spreading the poison and ultimately killing them.

Though it is not a common household item, boric acid is used as a pesticide to exterminate cockroaches. It has been proven to have a 100% mortality rate when the concentration is less than 0.5%. Although boric acid can take a while to kill cockroaches, it is very effective when used correctly.

The powder needs to be placed in areas where the roaches frequent, eventually killing them. However, it is important to remember that the boric acid takes a few days or weeks to do its job, so be patient!

How to use boric acid for killing roaches

Boric acid

To bait the boric acid, you will need to use other attractive smells and food items. So, here are the five different ways to use boric acid for killing roaches. 

The traditional boric acid dust method

You can sprinkle it in areas where cockroaches are often seen, like near the sink or in a corner. You can also apply it to cabinets, drawers, countertops, and dustbins. You can also put it in a container and leave it overnight. 

Vacuum up any remaining boric acid and clean all areas with a wet rag for best results. The traditional way of using boric acid to get rid of cockroaches is by applying it at night when the roaches come out.

It usually takes 2-3 days for the boric acid to kill the roaches. If you don’t have any such service, you can also use a backpack vacuum as a duster for roach control.

Boric Acid And Sugar

Boric acid is a very effective cockroach killer. Cockroaches are drawn to sugar. So if you want to bait them with something, put out a little bit of sugar. To make it more potent, mix it with sugar. It will help the roaches eat it and bring the poison back to their nests.

Boric Acid With Flour

To make a boric acid and flour mixture:

  1. Mix the two ingredients in a 50/50 ratio.
  2. Form dough balls and place them in corners, under sinks, and behind appliances.
  3. Place in other strategic spots such as along floorboards and around garbage bins. 

It will help keep the cockroaches at bay. The combination of boric acid and flour will help to kill cockroaches effectively. If the cockroaches are not responsive to this bait, add some sugar for extra sweetness.

Boric Acid And Egg Yolks

Boric acid against cockroaches

There are many ways to get rid of cockroaches, and one popular method is using boric acid and egg yolks. Cockroaches are attracted to the smell and taste of eggs, so by combining the two ingredients, you create a powerful cocktail that will kill any roaches in the area. 

The sticky consistency of the egg yolk will help keep the roach trapped. Place these traps in areas where cockroaches are crawling, and you should see a decrease in their population over time.

To make the recipe, you need 

  • place egg yolks in a bowl 
  • add 1 cup of sugar 
  • Add 2.5 ounces of boric acid 
  • Mix the ingredients to form a thick paste 
  • Make balls out of the paste 
  • The balls will kill the cockroaches when they eat them.

Boric Acid And Peanut Butter

Boric acid and peanut butter is a common mixture to get rid of cockroaches. The two ingredients form a huge ball. Press into small containers or bottle caps for easy transportation. When the cockroaches eat the bait, they will die.

Boric acid and peanut butter are effective cockroach killers. Cockroaches will ingest the boric acid, which will then kill them. You can place filled containers or bottle caps in cockroach-infested areas to get rid of them.

How long does boric acid last?

Boric acid is a slow-acting cockroach killer, meaning that it can take up to three days for a cockroach to die after ingesting it. In most cases, this is an effective method of getting rid of cockroaches.

However, there are some instances where boric acid may not be enough to kill all the cockroaches in an area. It’s important to remember that whatever they are near will die when one cockroach is poisoned.

It is an effective way to get rid of cockroaches, but it takes time. The roaches carry the poison back to their nests and spread it to other roaches. It works by rubbing against other cockroaches, leaving behind poisoned feces, dying within the colony, and being eaten.

The boric acid will eventually poison the entire colony, leading to the death of all of the cockroaches. 

9 Common Mistakes In Using Boric Acid

Boric acid is a popular roach killer, but it is important to use it correctly. There are nine common mistakes people make when using boric acid. 

  • Using boric acid as a one-step solution is ineffective and can be dangerous. It is important to identify the source of the cockroach infestation and take steps to address that before using any pesticide.
  • Boric acid is a known treatment for cockroaches, but there are some things you should know before using it. It’s most effective when paired with other treatments like diatomaceous earth. You also need to be aware of the potential dangers of using boric acid and how to avoid them.
  • Using adhesive traps with boric acid might not be good. When you do this, the cockroaches will be able to avoid the poison, and you’ll wind up with a bigger infestation.
  • Applying boric acid directly onto countertops, floors, or other surfaces where food is prepared or eaten. It is dangerous because you might ingest the boric acid, but it will also make the cockroaches resistant to the poison.
  • Never leave the baits where pets and children can get to them, as they are toxic to humans, pets, and plants. 
  • Make sure to place the bait in areas where there is a lot of traffic for the cockroaches – near cracks and crevices, behind appliances, and under cabinets.
  • Boric acid must be used in a bait and not as a spray to be effective. Additionally, it is important to sprinkle just enough bait so that the roaches are interested, rather than covering the entire area with bait.
  • Boric acid is a cheap, effective, and flexible pest control agent. It’s not going to be an instant hit. It starts slow. It may take a little time for the boric acid to work its magic. 
  • Another mistake is not often replacing the baits; they will eventually lose their potency, and the roaches will return. So keep replacing baits, and you’re going to see results after a week or so.


In conclusion, roaches living and breeding grounds include under sinks and refrigerators, but they also come out at night. Roaches are prolific breeders and can quickly infest a home or business. Boric acid is one of the most effective cockroach control agents available because it destroys their nervous system.

Though there are many commercial remedies on the market to kill cockroaches, the only natural remedy known to be effective is boric acid. It comes in powder form so sprinkle in areas where roaches are often seen. The acid will kill the roaches upon contact.

About the author

A biotechnologist by profession and a passionate pest researcher. I have been one of those people who used to run away from cockroaches and rats due to their pesky features, but then we all get that turn in life when we have to face something.