Children play in the garden, then scream from a burning sting, and a small white blister appears afterward. This is the sign of the fire ant (Solenopsis), one of the most troublesome ants because it stings repeatedly and defends its nest fiercely.
This article is part of the complete ant guide, and here we explain how to recognize it, what to do after a sting, and how to control it.
Appearance: Reddish-brown ants, with workers varying in size from about two to six millimeters.
Nest: Raised mounds of fine soil in grass or around trees and pavements.
Danger: The sting is painful, causing a burning sensation and then fluid-filled blisters, and it can cause severe allergic reactions in some people.
Aggression: They attack in large numbers when the nest is disturbed, so do not try to knock down the mound with your foot or a stick.
The solution: Use baits and insecticides made for fire ants and treat the mounds themselves, not just the visible ants, and call a professional if the infestation is large.
How Do You Recognize Them?
They are reddish-brown, and workers vary in size from two to six millimeters. They build earthen nests shaped like irregular mounds, without a single visible opening.
- Mounds: Raised fine soil in grass or around trees and pavements, appearing after rain or irrigation.
- /strong> They pour out by the hundreds when the mound is touched and climb up the leg quickly.
- Stings: They grip with their jaws and then sting repeatedly with the abdomen, and painful white pustules appear within a day.
What to Do After a Sting
Most stings can be treated at home, but some people are severely allergic.
- Move the person away: From the mound right away and remove the ants from the skin.
- Wash the skin: With soap and water and apply a cold compress.
- Do not pop the blisters: They become inflamed and leave scars.
- Call a doctor immediately: If there is difficulty breathing, facial swelling or severe dizziness, as it may be a serious allergic reaction.
How Do We Control Them?
Destroying individual mounds with boiling water or digging does not give a lasting result, because the colony moves and renews itself. The better method combines bait with spot treatment.
- Place bait around the mounds: A short distance from them, so the workers carry it to the queens inside the nest.
- Do not disturb the mound: Disturbance pushes them to relocate the colony.
- Treat the surroundings: A perimeter spray along the boundary of the house, applied a few days after the bait, prevents entry.
- Recheck after two weeks: Because new nests appear after rain.
For the general plan see getting rid of ants, and to keep them out of the house see ant prevention.
Fire Ant Behavior and Why They Show Up in Gardens
A mature colony may contain hundreds of thousands of workers, and it defends its nest quickly and in unison when it senses danger.
- Mass attack: They climb the body within seconds and then sting at almost the same time.
- Multiple nests: One garden may hold several mounds connected by tunnels.
- Drought: In dry weather they head to damp, irrigated areas.
- Electrical hazards: They sometimes chew wires and gather in electrical boxes.
Prevention in the Garden
- Inspect the garden after irrigation or rain and note where the mounds are.
- Keep children and pets away from active areas until treatment is complete.
- Wear closed shoes when working in the garden.
- Do not disturb the mound with a shovel before treatment.
When Is It an Emergency?
Some people react strongly to the venom, and in these cases medical help should be sought immediately:
- Shortness of breath or throat swelling.
- Swelling of the face or lips.
- Nausea and dizziness after the sting.
- Multiple stings in a small child or an elderly person.
How Do You Tell a Fire Ant Mound from Others?
A fire ant mound looks like a pile of fine, crumbled soil, and you often cannot see a clear opening at the top, because the workers go in and out through side tunnels underground. When the mound is touched or approached, large numbers come out within seconds and climb whatever they land on, then sting at almost the same time, which is why the stings are multiple and not a single sting.
- Fine, crumbled soil with no visible central opening.
- A fast response from the colony to any vibration.
- Small pustules containing fluid about a day after the sting.
How Does Bait Work in Gardens?
Granular bait made for fire ants is carried by the workers to the queen, and it is spread on the ground around the mounds and where the ants are moving. It is best applied when the ground is dry and not wet, because moisture spoils the granules, and at a time when the ants are actively foraging for food. Follow the label instructions for the amount and timing, and do not double it thinking it will work faster.
When a Sting Is More Than an Annoyance
For most people the stings pass with swelling, redness and itching, but some suffer a severe allergic reaction. If shortness of breath, swelling of the face or lips, or dizziness appears after a sting, call emergency services immediately and do not wait. Take extra care with children and the elderly if they play near mounds.
Products from the Orkida Store
We start with bait because ants carry it back to the nest, and we add a perimeter treatment when needed. We advise following the dose and safety interval written on the product label.
- Advion Ant Gel 30 g: An indoxacarb gel. Apply small dots along ant trails and the workers carry it to the nest and share it with everyone, queen included. It is the foundation of any plan.
- Advion Ant Gel Package 120 g: The large pack for bigger homes or recurring infestations, allowing more dots across multiple trails.
- Professional Ant Control Package for Homes: A professional package combining bait and perimeter treatment. We prefer it when the nest is outside the building and needs a barrier at the entry points.
- Economy Ant Control Package for Homes: An economy package that covers apartments and light infestations.
Frequently Asked Questions
Is a fire ant sting dangerous?
It is painful but not dangerous for most people. The risk is for people with allergies, or when children receive multiple stings.
Why do mounds appear after rain?
Rain raises the water level in the nest, which pushes the ants to build a new, higher mound or to move.
Do they come into the house?
Yes. They come in looking for food or moisture, and they may nest in walls near the foundations.
Should I burn the mound?
No. It is dangerous for the garden and the house and does not kill the queens. Bait is more effective and safer.
How can I recognize a fire ant sting?
It causes an immediate burning sensation and small white blisters after a few hours, and often several stings in close succession because the ants attack as a group.
What should I do after a sting?
Wash the area with soap and water and apply a cold compress, and do not pop the blisters. If shortness of breath or widespread swelling appears, seek medical care immediately.
Should I pour boiling water on the nest?
It is not recommended, as it may not reach the queen and it exposes you to stings and burns. It is better to use bait and then treat the nest with a suitable insecticide.
How do I protect the garden from their return?
Reduce excess moisture, remove food scraps and animal waste, and watch for new earthen nests after irrigation or rain.
Image source: Insects Unlocked, Wikimedia Commons (CC0)