| Species | Key Trait | Concern |
|---|---|---|
| Odorous house ants | Smell like rotten coconut when crushed | Multiple queens; difficult to control |
| Pharaoh ants | Very small; light yellow-brown | Can spread disease in hospitals |
| Argentine ants | Dark brown; large colonies | Displace native ant species |
| Ghost ants | Very small; pale legs and abdomen | Nest in moist areas |
| Carpenter ants | Large; black or red-black | Damage wood structures |
Important: For some species, you need to work fast. If the ants you follow are disappearing behind a rotted windowsill, you might have carpenter ants. These ants build their nests in water-damaged wood. “In nature, this helps break down fallen trees and recycle their nutrients back into the soil,” Skvarla says. “In homes and other buildings, this can weaken structural timbers and, if enough damage is done, cause substantial damage to the building.”
Step 2: Choose Your Ant Removal Method
Now that you know what type of ant you have and where they live, it is time to eliminate the ants. The experts suggest starting with simple solutions and working your way up from there.
Method 1: Place Bait Stations
Prepackaged bait stations are the easiest place to start your attempts to eliminate ants. Ant colonies send out scouts to find and bring back food to the nest, and you can use this against them.
| Season | Preferred Food |
|---|---|
| Spring | Sweets (energy to start working) |
| Summer to fall | Proteins (reproduction) |
How to choose bait: Look on the back of bait station packages for a note that says (for example) “kills common sweet-eating ants.”
Testing ant preferences: If you are unsure what the ants are going for, test them with:
-
Peanut butter (protein)
-
Honey (sweet)
-
Fried foods (fat)
Method 2: Try DIY Remedies
Harlow-Ellis says making your own bait can work, too.
DIY Borax Bait
| Ingredient | Amount |
|---|---|
| Borax | 1 part |
| Sugar or peanut butter (depending on ant preference) | 3 parts |
| Water | Enough to make a paste |
Mix together and place on small pieces of cardboard near ant trails.
Diatomaceous Earth
| Method | How It Works |
|---|---|
| Sprinkle around entry points | Causes insects to desiccate (dry out) |
| Safe for people and pets | Not harmful to mammals |
Method 3: Spray the Foundation
Some ants may resist the effect of bait stations due to the sheer size of their colony. Odorous house ants are one example.
“They can have multiple queens per colony, so are often extremely difficult to control,” Skvarla says. “Bait stations are a good first start, but if those do not work then a foundation spray of insecticides may be necessary.”
Important: Read the foundation spray’s instructions carefully, and apply as directed.
Method 4: Eliminate the Nest
| Situation | Action |
|---|---|
| Nest inside walls | Inject insecticide powder or aerosol into wall voids (consider calling a pro) |
| Serious infestation | Professional pest control may be necessary |
| Carpenter ants | Do not mess around—they can cause structural damage |
Method 5: Yard Ant Management
For ants in the yard, unless they are dangerous or destructive, the experts advise leaving them be.
| Yard Ant Type | Action |
|---|---|
| Carpenter ants in weakened root systems | Can cause trees to fall; address if near structures |
| Fire ants | Aggressive; sting if mound is disturbed |
| Other ant species | Pose no harm; leave alone |
