How to Use Boric Acid in the Home to Kill Cockroaches

Cockroaches are prevalent in areas that are warm and humid. They tend to stay where there is food and water, which is why most homeowners will find the worst infestations concentrated in the kitchen area. Since cockroaches breed so quickly—producing up to several thousand offspring per year according to the University of Kentucky—they can be hard to get rid of. Boric acid is a odorless powder that is deadly to cockroaches yet has a very low toxicity level in regards to humans and pets. It is derived from water and boron, and it kills cockroaches by attacking the exoskeleton and causing dehydration.

Instructions

1. Determine the areas that are infested with cockroaches, and pinpoint any possible entryways that they may use to gain access to your home. Normal hot spots for cockroaches include cupboards, bathrooms, storage closets and behind or underneath appliances.

2. Use boric acid powder in small cracks and crevices where cockroaches may hide. Shake the container of boric acid, and then carefully squeeze the container to puff out a small amount of the powder. Apply a very small amount for best results, as cockroaches will shy away from large piles of powder. Boric acid powder is best for hard-to-reach places, such as spaces between cabinets and floors and under refrigerators, dishwashers and ovens.

3. Make a homemade boric acid spray that is just as effective as commercial pesticide sprays but far less toxic. Pour 3 cups of water and 1/4 cup of boric acid in a spray bottle. Shake the bottle to combine the mixture, and then spray it along the baseboards of your home as well as behind counters and in the corners of storage closets. Label the spray bottle to prevent accidents.

4. Place boric acid tablets underneath couches and appliances, and also in the corners of cupboards and cabinets. These tablets work the same way as the loose powder does but with less mess. You should avoid using these tablets if you have pets or small children that may think that they are food or candy.

Tips & Warnings

• Avoid using boric acid on surfaces that you use to prepare or eat food.

• Wipe off any surfaces that are left with a visible boric acid residue.

References

• University of Kentucky College of Agriculture: Cockroach Elimination