Safely Get Rid of Carpenter Ants in a Snap
We’ve had two major infestations of carpenter ants to deal with in the 22 years of living in our home.
The first occurred shortly after we moved in. Our house was built in 1951 and sits in a semi-rural neighborhood with lots of trees, vegetation and moisture due to a backyard lake. Needless to say, it is the perfect environment for critters of all kinds including carpenter ants.
The first infestation had me calling the pest control company in a hurry. Carpenter ants are huge and very scary looking as you can see from the picture above. They actually don’t even bite and you can pick them up with your fingers and throw them in the toilet or flush down the drain with no problem. At the time, though, I didn’t know any of this, so seeing dozens of large, red ants running around my then retro style 1970’s orange and yellow kitchen was not a pretty sight.
I picked up the phone and called pest control and after a couple toxic sprayings around our house, yard and then in our attic over the course of a week or two, the carpenter ants were gone.
Our second infestation of carpenter ants happened just a few weeks ago, and this time, I handled it very differently.
Having the knowledge and wisdom of 20 years of green living behind me, I was determined and very confident I could resolve this infestation with zero pesticides and no call to pest control.
My youngest was especially freaked out by the enormous size of the carpenter ants even after I explained that they don’t bite and picked up one in my fingers to show her. Unfortunately, my little pep talk and demonstration didn’t do much to alleviate her fears of these intimidating, wriggling creatures.
The carpenter ants were swarming in our kitchen and bathrooms and after starting with just one or two here and there, over the course of a week they came in by the dozens overnight while we slept making for a very scary turning on of the lights in the morning, if you know what I mean. We spent the first 15 minutes of the morning vacuuming them up before we could even get started with breakfast!
After watching and observing their patterns over the course of a day or two, I determined that their primary mode of entrance into our home appeared to be the drain of the dishwasher.
Knowing where the carpenter ants are getting into the house is a helpful piece of information, but not entirely necessary if you wish to eradicate them yourself via nontoxic measures.
In our case, the dishwasher drain seemed a likely ground zero, so I mixed up my carpenter ant killer ambrosia and set the bait.
Nontoxic Carpenter Ant Bait
My one cup of bait consisted of the following all of which cost less than $1:
- 1/3 cup of powdered white sugar
- 2/3 cup boric acid (where to find)
That’s it!
When I took our container of boric acid out of the garage utility cabinet, it consisted of a bunch of hardened chunks that needed to be pounded out as I hadn’t used it in a long time. So, I took out my mortar and pestle and pounded out a few big chunks to re-powderize and then measured it into a small ziplock bag that contained the appropriate amount of powdered sugar.
Boric acid is a colorless white powder that is a mild antiseptic, but certainly not a problem to the health of your family even if you touch it with ungloved hands. It is found in nature in some volcanic environments near Tuscany and Nevada. Boric acid and its salts are found in seawater and plants including almost all fruits.
Of course, you need to keep it away from small children as it is poisonous if ingested or inhaled in large quantities, but it is probably the least toxic form of insect bait you can use around your home with the exception of diatomaceous earth, which unfortunately doesn’t work as well or as quickly for large ants where I live.
I placed a couple of tablespoons of the carpenter ant bait in the lid of an empty jar I was going to recycle, and placed inside the dishwasher on the bottom near the drain just before going to bed. Before I did this, however, I was careful to run a load of dishes and empty everything out so the dishwasher was completely void of any plates, glasses or utensils.
A Happy Ending to our Carpenter Ant Infestation
The next morning we were delighted to see that there were no carpenter ants running around the kitchen! When I opened the dishwasher to have a peek, they were swarming around the bait but were totally confined to that area.
I gently closed the door of the dishwasher and left the ants there, happily eating away at the bait they would take back to their nest to kill the whole colony.
It took a few days, but gradually, the carpenter ants swarming inside the dishwasher completely disappeared with nary a stray one left!
When I needed to run the dishwasher in the interim, I simply removed the container of bait, ran a load, emptied the clean dishes, and then replaced the bait near the dishwasher drain.
Simple, effective, nontoxic, and best of all, cheap with no call to pest control to come and spray who-knows-what hormone disrupting, carcinogenic chemicals around your home for your family to breath and absorb!
Sarah, The Healthy Home Economist
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