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For most indoor ant trails, The Spruce’s best fit is Terro T300B Liquid Ant Baits. For ants outside around a foundation or patio, it is Amdro Ant Block Home Perimeter Ant Bait. Use Advion when precise gel placement is useful, BioAdvanced when you need an exterior barrier for a suspected carpenter-ant problem, and Ortho Orthene for fire-ant mounds. Raid is for fast spot killing, while the natural options are better suited to deterrence, outdoor barriers, or garden dusting.
Version note: The requested title says “8,” but the accessible version of The Spruce article is titled The 9 Best Ant Killers The Spruce Has Tested, dated June 2, 2026, and currently contains nine products. This article retains the requested title while accurately covering all nine current picks rather than implying that the live article has only eight.
At a glance
The right ant killer depends more on the ant problem than on the product’s overall ranking. Use a colony-targeting bait for ants trailing through a kitchen or bathroom, a perimeter treatment for outdoor prevention, a product specifically labeled for carpenter ants when wood or moisture damage may be involved, and a fire-ant mound treatment for fire ants. Contact sprays and natural repellents have narrower roles.
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| Pick | Best for | Application | Colony control? | Main limitation |
|---|---|---|---|---|
| Amdro Ant Block Home Perimeter Ant Bait | Overall outdoor protection | Granular perimeter bait | Yes, when workers carry it back to the colony | Works best in dry conditions; keep people and pets away as directed on the label |
| Terro T300B Liquid Ant Baits | Common indoor household ants | Pre-filled liquid bait stations | Yes, but control may take two to four weeks | Not intended for fire ants, pharaoh ants, carpenter ants, or harvester ants |
| BioAdvanced Ant and Termite Killer | Carpenter-ant perimeter treatment | Concentrate applied with a pump sprayer | Primarily a barrier; not a stand-alone colony eliminator | Rain can shorten the treatment’s useful life |
| Syngenta 53204 Advion Ant Gel | Precise bait placement | Gel in cracks, crevices, and other targeted areas | Yes; delayed mortality allows transfer among ants | Applicator is awkward, and the bait must be kept away from children and pets |
| Mighty Mint Insect & Pest Control | Light activity and deterrence | Peppermint-oil spray | No; best treated as a deterrent | Did not visibly kill ants or control active colonies in testing |
| Raid Ant & Roach Killer Aerosol Spray | Visible ants and entry points | Contact aerosol | No | Fast but temporary; leaves an oily residue and has a strong smell |
| First Saturday Lime Insect Repellent | Outdoor repellent barriers | Powdered exterior treatment | Not in the same way as a bait | No applicator is included, and wind makes it difficult to spread |
| Garden Safe Diatomaceous Earth Crawling Insect Killer | Garden and soil applications | Dust around soil, cracks, and outdoor boundaries | No; it kills exposed insects rather than feeding the colony | Messy, difficult to use on hard surfaces, and not a carpenter-ant treatment |
| Ortho Orthene Fire Ant Killer | Fire-ant mounds | Mound-treatment powder | Yes; intended to destroy the mound and queen | For fire-ant mound treatment, not a general indoor ant product |
The 9 current picks, explained
1. Amdro Ant Block Home Perimeter Ant Bait: best overall for outdoor protection
Amdro Ant Block Home Perimeter Ant Bait is the strongest all-around choice when ants are entering from outside or appearing around a home’s foundation, patio, garage, or other exterior boundary. It is a granular bait designed to create a perimeter rather than simply kill the ants you can see.
The Spruce’s reported testing found it effective against 25 ant species and capable of eliminating colonies. Amdro’s product information describes the same basic mechanism: worker ants consume the granules and carry the bait back to the colony. Under suitable dry conditions, protection can last up to three months.
#1 Best Overall
- Ant bait controls 25 species of ants like acrobat ants, Argentine ants, carpenter ants, crazy ants, nuisance ants, odorous house ants, pavement ants, Pharaoh ants, and more
- Use this outdoor ant killer any time ants are active; for best results during hot weather, apply in cool early morning or early evening; do not apply to wet ground or grass, before rain within 24 hours, or below 50°F
- Prevent ants from invading your home with Amdro Ant Killer for Outdoor Home Perimeter protection, an ant killer outdoor ideal for lawns, landscaped areas and ornamental gardens
- For maximum protection use with Amdro Ant Killer Bait Stations or Stakes inside or around your home for additional protection against ants
- A trusted partner in pest control since 1980; count on Amdro for highly effective solutions for your pest control needs
That combination of broad species coverage, outdoor use, and colony-targeting action is why it earns the overall position. It is not the best choice for scattering indoors, and rain or persistently damp ground can reduce performance. Apply it only where the current label permits, and follow all restrictions involving children, pets, edible plants, and treated areas.
Choose it when: ants are concentrated outdoors or are repeatedly crossing the foundation and you want a preventive perimeter treatment.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitches2. Terro T300B Liquid Ant Baits: best for common indoor ants
Terro T300B Liquid Ant Baits are the clearest fit for a typical indoor trail of small, common household ants around a kitchen, bathroom, window, or door. Each station contains a sweet liquid bait that worker ants can consume and transport to the nest.
In The Spruce’s reported test, visible activity declined within 24 hours and disappeared by the third day. That does not necessarily mean the colony is gone. TERRO says the active ingredient is 5.40% sodium tetraborate decahydrate, commonly called borax, and the product’s colony-control process is deliberately slower. Full control may take two to four weeks.
It is normal to see more ants around a fresh bait station at first. That activity can indicate that foragers have found the food source and are carrying it home. Avoid disrupting the trail while the bait is being used, and do not spray contact insecticide directly over or beside the bait if doing so prevents ants from feeding.
This product is not a universal ant solution. TERRO specifically warns that it does not work on fire ants, pharaoh ants, carpenter ants, or harvester ants. Keep stations inaccessible to children and pets, or use the protective placement required by the current label.
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Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteChoose it when: you have a persistent indoor trail and have identified it as a common household ant problem rather than a fire-ant, carpenter-ant, pharaoh-ant, or harvester-ant infestation.
3. BioAdvanced Ant and Termite Killer: best for a carpenter-ant perimeter barrier
BioAdvanced Ant and Termite Killer is a concentrated liquid treatment for creating an exterior barrier. It requires a pump sprayer, so it is better suited to a homeowner prepared to measure, mix, and apply a perimeter treatment than to someone seeking a ready-to-use indoor bait.
The Spruce reported strong barrier performance and up to three months of protection. The important qualification is that this is primarily a preventative barrier, not a product that by itself finds and eliminates an established carpenter-ant colony inside a wall, roof void, tree, or piece of damaged wood. Rainy conditions may require more frequent reapplication.
Carpenter ants also deserve a building investigation. Look for damp or decaying wood, roof or plumbing leaks, poor drainage, damaged siding, and branches or other materials touching the structure. A barrier can reduce traffic at the exterior, but it does not repair the condition attracting or supporting the colony.
Accessory: If this concentrate is the appropriate labeled treatment for your situation, you may also need a pump sprayer for perimeter treatment. The sprayer is an application tool, not a substitute for the correctly labeled pesticide or for investigating structural moisture.
Choose it when: you need an exterior barrier around a structure and carpenter ants are suspected, while understanding that recurring activity or evidence inside wood may require identification and professional treatment.
4. Syngenta 53204 Advion Ant Gel: best for precise gel placement
Syngenta 53204 Advion Ant Gel is the most targeted option in this group. Its gel can be placed in cracks, crevices, edges, and other locations where a granular product or liquid station would be impractical. The active ingredient is indoxacarb.
Advion uses delayed mortality. Ants are attracted to the gel, consume it, and can transfer its effects among nestmates before dying. The Spruce reported strong attraction within 24 hours, a sharp decline over the following days, and elimination of the tested infestation by the end of the second week.
The trade-off is application. The tester found the applicator awkward, and gel placement needs to be controlled carefully. Keep it away from children and pets and use only in locations allowed by the current product label. Do not treat exposed food-preparation surfaces or other prohibited areas.
Rank #2
- Ant bait controls 25 species of ants like acrobat ants, Argentine ants, carpenter ants, crazy ants, nuisance ants, odorous house ants, pavement ants, Pharaoh ants, and more
- Use this outdoor ant killer any time ants are active; for best results during hot weather, apply in cool early morning or early evening; do not apply to wet ground or grass, before rain within 24 hours, or below 50°F
- Prevent ants from invading your home with Amdro Ant Killer for Outdoor Home Perimeter protection, an ant killer outdoor ideal for lawns, landscaped areas and ornamental gardens
- For maximum protection use with Amdro Ant Killer Bait Stations or Stakes inside or around your home for additional protection against ants
- A trusted partner in pest control since 1980; count on Amdro for highly effective solutions for your pest control needs
Choose it when: you need a small, precise amount of colony-targeting bait in a crack, crevice, or other protected location.
5. Mighty Mint Insect & Pest Control: best natural deterrent for light activity
Mighty Mint Insect & Pest Control is a peppermint-oil-based spray for light indoor problems, deterrence, and prevention. It was easy to apply and had a more pleasant peppermint scent than many conventional aerosols.
Its limitation is central to using it correctly: The Spruce reported that it did not visibly kill ants during testing and was not effective against active colonies or large infestations. It is therefore better described as a deterrent for minor activity than as a replacement for a bait that workers carry to the nest.
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If ants continue to appear from the same wall gap, sill, pipe opening, or foundation joint, spraying the exposed trail may only move the problem or temporarily mask it. Locate and seal the entry point after treatment, and use a species-appropriate colony-control product if ants remain active.
Choose it when: the problem is minor and your priority is a peppermint-oil deterrent, not rapid colony elimination.
6. Raid Ant & Roach Killer Aerosol Spray: best for visible ants and spot treatment
Raid Ant & Roach Killer Aerosol Spray is the quick-response option. It kills ants on contact and can provide residual action around suitable entry points, making it useful when ants are suddenly visible along a sill, floor edge, or exterior opening.
It does not generally eliminate the nest. The Spruce’s reported testing found rapid killing but also noted an oily residue and strong smell. If the objective is lasting colony control, use a compatible bait strategy rather than relying on the aerosol alone. A spray can remove the ants you see while leaving the reproductive center untouched.
Use it as a spot treatment only where the label allows, ventilate as directed, and keep people and pets away from treated areas according to the product instructions.
Choose it when: you need immediate control of visible ants or an entry point and understand that contact killing is not the same as colony elimination.
7. First Saturday Lime Insect Repellent: best for an outdoor repellent barrier
First Saturday Lime Insect Repellent is a powdered lime product used as an exterior barrier and repellent. It is odorless and was positioned in The Spruce’s testing as an outdoor option for gradually reducing ant activity rather than as a fast-acting bait.
During the reported test, activity gradually decreased, no new ants were seen in treated areas after one to two weeks, and the tester reported no return after six months. Those observations describe that testing experience, not a guarantee for every species, climate, or property.
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Choose it when: you want an odorless outdoor repellent barrier and can apply a powder carefully in weather that will not immediately disperse it.
8. Garden Safe Diatomaceous Earth Crawling Insect Killer: best for the garden
Garden Safe Diatomaceous Earth Crawling Insect Killer is a dust for use around soil, gardens, cracks, and outdoor boundaries. Diatomaceous earth works mechanically by damaging and drying out exposed crawling insects rather than by having workers carry a toxic food bait back to the nest.
The Spruce reported that an outdoor ant swarm virtually disappeared within 24 hours. The product was also described as natural and affordable. Its practical drawbacks are that dust is messy, hard to spread neatly on hard surfaces, and dependent on remaining in place and dry enough to work.
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- ATTRACTS & KILLS: Liquid ant bait stations provide comprehensive ant control, targeting common household ants including acrobat, crazy, ghost, little black, odorous house, and pavement ants throughout your home with effective ant traps indoor
- KILLS THE QUEEN & THE ENTIRE COLONY: TERRO liquid ant bait contains borax-based formula that attracts worker ants to consume and carry back to the colony, effectively eliminating both visible ants and hidden nest populations for complete indoor ant killer control
- EFFECTIVE ELIMINATION: Fast-acting ant killer bait reduces ant activity within days as worker ants transport the liquid ant bait back to their colony, providing widespread elimination of entire ant populations with these sugar ant traps indoor
- EASY TO USE: Ready-to-use ant bait stations require no setup and can be placed along baseboards, corners, countertops, and other high-traffic areas where ants commonly travel for optimal ant trap indoor pest control results
- LONG-LASTING: Once placed, the bait continues to work for weeks, as long as ants continue to visit the stations. Complete control may take up to 2-4 weeks, depending on the infestation size
For more controlled application, a diatomaceous earth duster or squeeze duster can help distribute a thin layer instead of a heavy pile. More product is not automatically more effective. Use only the application method and locations permitted on the package.
This is not the pick for carpenter ants. A dust around a garden boundary will not address a colony nesting in damp structural wood or within a wall cavity.
Choose it when: ants are active around garden soil or outdoor cracks and you prefer a dust treatment for exposed crawling insects.
9. Ortho Orthene Fire Ant Killer: best for fire-ant mounds
Ortho Orthene Fire Ant Killer is the specialized choice for fire-ant mound treatment. It is a powder applied to the mound with the goal of killing the queen and destroying the colony, rather than treating a household ant trail.
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The Spruce reported that it begins working in about 60 minutes and that one 12-ounce container treats up to 162 mounds. These figures depend on using the product according to its current label. Ortho distinguishes mound treatment from broadcast treatment: a mound product addresses existing mounds, while a broadcast treatment is a separate prevention strategy.
Do not substitute an indoor sweet-ant bait for a fire-ant product. Species, nesting behavior, and product labels differ. Keep people and pets away as required, avoid handling treated material unnecessarily, and follow the package directions for application, storage, and re-entry.
Choose it when: you have identified fire-ant mounds and need a product specifically labeled for that job.
How The Spruce’s testing informs these picks
The Spruce reported testing more than a dozen ant killers in testers’ homes while they dealt with ant infestations. The evaluation considered ease of use, effectiveness, longevity, and overall value. Testers recorded what happened after 24 hours, three days, seven days, and 14 days, then checked for recurrence at 30 and 90 days. The testing period extended beyond six months.
That timetable matters because a product can appear successful after one day while leaving a nest intact. Contact sprays often look best immediately because they kill exposed ants quickly. Baits can look worse before they look better because they attract foragers to the food source. A meaningful comparison therefore needs both short-term observations and later recurrence checks.
The results should still be read as reported testing experience, not as a guarantee that every product will perform identically at every property. Ant species, nest location, weather, moisture, competing food sources, application rate, and label-compliant placement all affect the outcome.
Bait versus spray: the decision that matters most
Use bait when colony control is the goal
Baits combine a food attractant with a slower-acting toxicant. Foraging workers feed on the bait and transport it to the nest, where it can affect other ants and, depending on the product and species, the queen. This is why Terro and Advion are more appropriate than an aerosol when ants keep returning from the same hidden location.
Do not judge a bait solely by how many ants die in front of it during the first few hours. A temporary increase in activity can mean that workers have found the bait. Give the product the time specified by its label, remove competing food and drink sources, and avoid contaminating or spraying the bait.
Use a contact spray for immediate visible control
A contact spray is useful for exposed ants and limited spot treatment. It is not usually a nest treatment. Raid can make a visible trail disappear quickly, but it cannot be assumed to eliminate the colony. For lasting control, pair the immediate spot treatment with a species-appropriate bait only if the label and placement allow both products to be used safely.
Use a repellent or dust for a narrower outdoor role
Mighty Mint, First Saturday Lime, and Garden Safe’s diatomaceous earth have different uses from colony-targeting baits. Mighty Mint is primarily a light-activity deterrent. First Saturday Lime is an exterior repellent barrier. Diatomaceous earth kills exposed insects through desiccation and is most practical around soil and gardens. None should automatically be treated as interchangeable with an indoor liquid bait or a fire-ant mound treatment.
Choose by ant problem, not by product category
- Indoor trail of small household ants: start with Terro T300B if the ants fit the product’s intended use. Place stations where ants are active but inaccessible to children and pets. Expect visible improvement before complete colony control.
- Ants around the foundation or patio: Amdro is the strongest fit among these picks for an outdoor perimeter bait. Keep the granules dry where possible and follow the current label around gardens, animals, and play areas.
- Ants associated with damp or damaged wood: treat carpenter ants as a building-condition problem as well as an insect problem. BioAdvanced can provide a labeled exterior barrier, but inspect for moisture, decay, leaks, and entry routes. Persistent activity inside walls or framing warrants professional identification.
- Ants in cracks or small protected voids: Advion’s gel allows more precise placement than a broadcast granule. Apply only in permitted locations and keep the gel inaccessible to children and pets.
- Fire-ant mounds: use Ortho Orthene Fire Ant Killer or another product specifically labeled for fire ants. Do not assume an indoor sweet-ant bait will control a fire-ant colony.
- Minor activity where deterrence is the priority: Mighty Mint or First Saturday Lime may fit better than a colony-killing treatment, provided the infestation is genuinely light and the label allows the intended application.
- Ants in garden soil: Garden Safe diatomaceous earth is the most targeted pick in this list for a garden-dust application, but it will not solve a colony hidden in the structure.
A practical ant-control sequence
- Identify the location and likely species. Note whether ants are indoors, around the foundation, in garden soil, emerging from wood, or forming fire-ant mounds. Product suitability varies by species.
- Remove competing food. Clean food and drink spills promptly, store food in sealed containers, wipe counters, and avoid leaving pet food out. This makes a bait more attractive and reduces the reason ants remain indoors.
- Select one primary treatment that matches the problem. Choose a bait for colony control, a perimeter product for exterior prevention, or a fire-ant-labeled mound treatment for fire ants. Do not combine products casually.
- Place or apply it exactly as directed. Use the required station, sprayer, dusting method, rate, and placement. Outdoor granules, powders, and gels can lose effectiveness in rain, damp ground, wind, or strong sunlight.
- Allow enough time. A contact spray may work within minutes, while a bait can require days or several weeks. Monitor at the intervals specified by the label rather than reapplying impulsively.
- Seal the route after activity declines. Close gaps around windows, doors, siding, masonry, pipes, and utility penetrations. Sealing too early can sometimes redirect ants indoors or trap activity in an unwanted location, so coordinate exclusion with the treatment plan.
- Escalate when the source is structural or recurring. If ants continue returning, appear from walls or framing, or are associated with moisture damage, arrange a licensed pest-control inspection rather than repeatedly spraying the visible trail.
Prevention measures that complement treatment
- Clean crumbs, grease, food residue, and drink spills as soon as possible.
- Keep pantry foods in sealed containers.
- Do not leave pet food out longer than necessary.
- Repair leaks and address damp areas around plumbing, roofs, windows, foundations, and crawl spaces.
- Seal gaps around windows, doors, siding, masonry, pipes, and other exterior penetrations.
- Trim vegetation and remove direct contact points that give ants a bridge to the structure.
- Recheck the treated area after rain or irrigation, since moisture can reduce the performance of outdoor granules, dusts, and gels.
Prevention is complementary, not a substitute for identifying the ant and selecting a properly labeled treatment. Sealing a gap will not remove a colony already nesting in a wall, and cleaning alone will not resolve a fire-ant mound or carpenter-ant infestation.
Rank #4
- TOTAL COLONY CONTROL: Outdoor ant killer intercepts ant colonies at their source, providing long-lasting pest control to intercept and target ants before they enter your home
- KILLS THE QUEEN & THE ENTIRE COLONY: TERRO liquid ant bait contains proven active ingredients that worker ants carry back to the colony, effectively targeting both visible ants and those hiding out of sight for complete elimination of the entire nest
- EASY TO USE: Ready-to-use ant killer outdoor stakes feature simple insert-and-cut design - just push into ground where ant activity is detected, cut the tab, and let the weatherproof ant bait stations work effectively through various weather conditions
- EFFORTLESS MONITORING: See-through bait station allows easy monitoring of ant activity and bait consumption, helping you determine when replacement ant traps are needed for continuous outdoor ant bait effectiveness against ant infestations
- AMPLE COVERAGE: 12-pack of outdoor liquid ant bait stakes designed to attract and eliminate common household ants including acrobat, crazy, ghost, and little black ants before they enter your home for comprehensive ant control
Safety and application cautions
No pesticide should be described as universally safe. Read the current product label before purchase and again before application; formulations, permitted sites, rates, and precautions can change. Use only the amount and method specified, and keep children and pets away from treated areas whenever the label requires it.
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Take extra care with bait stations, gels, granules, powders, and concentrated liquids. Keep Terro stations and Advion gel inaccessible to children and animals. Use the appropriate protective equipment and ventilation for concentrates and aerosols. Avoid breathing dust, getting product in the eyes, contaminating food or food-preparation surfaces, and allowing outdoor products to drift into neighboring areas or water.
If a label conflicts with a general tip in this article, the label controls. When the infestation is recurrent, widespread, located in structural wood, or difficult to identify, a licensed pest-control professional can help distinguish carpenter ants from other species and locate the nest or moisture source.
Frequently asked questions
What is the best ant killer for inside the house?
For common indoor household ants, The Spruce’s best-indoor pick is Terro T300B Liquid Ant Baits. It is a colony-targeting bait, so visible ants may gather around the station before activity declines. It is not intended for fire ants, pharaoh ants, carpenter ants, or harvester ants.
What is the best ant killer for outside around a house?
Amdro Ant Block Home Perimeter Ant Bait is the strongest fit among these tested picks for an outdoor perimeter. It is a granular bait intended to be carried back to colonies and can last up to three months under suitable dry conditions. Follow the current label for placement and restrictions.
Should I spray ants or use bait?
Use bait when the goal is colony control and use a contact spray when you need immediate spot treatment of visible ants. Sprays generally kill exposed ants without removing the nest. A bait can take longer and may initially attract more foragers, but that behavior is part of how colony-targeting bait works.
Will indoor ant bait kill fire ants?
Do not assume it will. Terro specifically excludes fire ants, along with pharaoh ants, carpenter ants, and harvester ants. Fire-ant mounds require a product labeled for fire ants, such as Ortho Orthene Fire Ant Killer, applied according to its current directions.
When should I call a pest-control professional?
Seek professional help when ants keep returning after label-compliant treatment, emerge from walls or structural wood, are associated with moisture or decay, appear throughout a building, or cannot be confidently identified. Carpenter-ant activity can be a symptom of a building-envelope or plumbing problem that pesticide alone will not correct.
Frequently Asked Questions
What is the best ant killer for inside the house?
For common indoor household ants, The Spruce’s best-indoor pick is Terro T300B Liquid Ant Baits. It targets the colony rather than only killing ants that are visible, although full control can take two to four weeks.
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Amdro Ant Block Home Perimeter Ant Bait is the strongest outdoor-perimeter choice among the tested products. It is a granular bait that workers carry back to the colony and can last up to three months in suitable dry conditions.
Should I spray ants or use bait?
Use bait when you want colony control and a contact spray when you need immediate spot treatment. A spray usually kills exposed ants without eliminating the nest, while bait works more slowly and may initially attract more foragers.
Will indoor ant bait kill fire ants?
No. Terro specifically warns that its liquid bait does not work on fire ants, pharaoh ants, carpenter ants, or harvester ants. Fire-ant mounds require a product labeled for fire ants, such as Ortho Orthene Fire Ant Killer.
When should I call a pest-control professional?
Call a licensed pest-control professional when ants recur after label-compliant treatment, emerge from walls or structural wood, are linked to moisture or decay, spread throughout the building, or cannot be identified confidently.
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Bottom line: Choose Terro T300B for a common indoor ant trail, Amdro Ant Block for an outdoor perimeter, Advion for precise gel placement, BioAdvanced for a carpenter-ant exterior barrier, and Ortho Orthene for fire-ant mounds. Use Raid for quick spot killing and the natural products mainly for deterrence, outdoor barriers, or garden dusting. Correct species identification and label-compliant application matter more than any single ranking.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
