An elderly customer called us at 10 pm in tears — drywood termites had just swarmed her kitchen and she'd sprayed Raid in a panic. Here's what we told her, why Raid doesn't work on termites, and what actually does.
We got the call at 10 pm. An elderly woman, frantic, almost in tears. Drywood termites had just swarmed inside her home — hundreds of winged insects flooding her kitchen, falling into her dog's food bowl, dropping into the water dish. She'd done what anyone would do in that moment: grabbed the Raid from under the sink and sprayed everything she could see.
By the time she called us, the floor was covered in dead swarmers. She wasn't worried about the termites anymore. She was worried about her dog. Had the Raid contaminated the food? Should she take him to the vet?
That was her first question. Her second: "Will the Raid kill the termites?"
We told her what we tell everyone in this situation. The Raid worked — on the swarmers. Those termites are dead. But the termites in her house are fine. They're still in the walls, exactly where they were before she grabbed that can. And they don't know anything happened.
Here's why — and what you should actually do if this was you last night.
What You Actually Killed
Termite swarmers — the winged termites that appear in your kitchen, flutter toward light fixtures, fall into dog bowls at 10 pm — are the reproductive caste of a termite colony. They're not workers. They don't eat wood. They exist for one purpose: leave the colony, find a mate, and start a new one somewhere else.
When a drywood termite colony matures — typically after 3 to 5 years of growth — it produces winged reproductives. These swarmers emerge in a single flight event, usually triggered by warm temperatures in late summer through fall — September through November is peak season here in Southern California. A mature drywood colony can contain 2,500 to 10,000 individuals. The swarmers represent maybe a few hundred of them.
The rest of the colony — the queen, the workers chewing through your wall framing, the soldiers guarding the galleries — they didn't go anywhere. They never leave. The swarmers you killed were the colony's attempt to expand, not the colony itself.
What that means practically: if you saw swarmers inside your home, that colony has been established and actively feeding for at minimum 2 to 5 years before you ever noticed them. Swarmers only emerge from mature colonies. The infestation isn't new. The swarm is simply the first sign you've seen of something that's been happening for years.
Killing the swarmers is the equivalent of swatting mosquitoes instead of draining the standing water. The visible part isn't the problem.
Why Raid Can't Reach the Colony
This is the part that matters, and it can be said plainly: termites live inside the wood and have to be treated inside the wood.
A drywood termite colony doesn't live on the surface of your framing. It lives inside it. Workers excavate gallery systems — networks of tunnels and chambers carved along the grain of structural lumber. They eat, breed, and raise new termites entirely within sealed wood, sometimes 8 feet or more from where you saw swarmers emerge.
When you spray Raid at swarmers in your kitchen, you're applying a contact insecticide to the open air and to whatever surface the spray lands on. That spray has no mechanism for penetrating sealed wood. It evaporates on the surface within hours. The gallery system behind your drywall is completely unaffected.
Raid doesn't work because it's not being shot into the wood where the termites live.
Even if you could break open every piece of infested framing and spray directly into the galleries, surface-contact insecticide still wouldn't solve it. Termite galleries branch and extend through multiple wood members. You'd reach some of the colony — not all of it. And what you missed would continue feeding.
Professional structural termite treatments are designed around this exact problem. Tent fumigation uses Vikane gas that penetrates every piece of wood in a tented structure. Orange oil is injected under pressure directly into confirmed gallery systems. Termidor soil treatment creates a continuous barrier in the soil that subterranean termites contact as they forage. These treatments work because they get to where the termites actually are. A spray can pointed at what you can see in your kitchen cannot do that.
What to Do Instead: Ryan's Actual Instructions
First: don't panic. Termite swarmers in your kitchen are alarming, but they're not a sign that your house is about to fall down. What the swarm tells you is that a colony exists somewhere in your structure — not that you're days away from structural failure.
For the woman who called us that night, we gave her three instructions: mop the floor, throw away the dog food and water that had been contaminated by the spray, and let us come take a look in person to figure out the right approach. That sequence holds for anyone in this situation.
Tonight: Stop spraying. More Raid doesn't change anything about the colony. Vacuum up the dead swarmers — they're harmless, just unpleasant. If you can, save two or three in a small sealed bag or container. Your inspector will want to see the species.
This week: Schedule a professional inspection. This is what tells you the species, where the infestation is located, and what treatment makes sense. Drywood and subterranean termites require completely different approaches — the species identification matters. Our situation page on swarmer sightings covers what to look for before the appointment.
This month: Get the inspector's recommendation in writing and look at your options. Drywood infestations can be addressed with tent fumigation, orange oil injection, heat treatment, or spot treatment depending on extent and location. Our full treatment comparison is there when you're ready to compare.
The goal isn't to spray what you can see. It's to eliminate what you can't.
The Home Depot Trap
The woman who called us grabbed Raid because it was what she had. That's understandable. But we regularly inspect homes where the homeowner made a more deliberate version of the same mistake: they drove to Home Depot, found termite products on the shelf, spent $20 to $50 on something that promised to handle it, and spent the next year wondering why termites kept showing up.
Here's the problem. Most over-the-counter products sold at home improvement stores aren't registered with the EPA for structural termite control. They're labeled for general insect spraying — effective on a wasp nest you can see, useless against a termite colony living inside your wall framing.
The products professional pest control operators use require a license to apply because they're specifically engineered for structural pest control. Termidor (fipronil) is applied in a continuous soil barrier around the foundation perimeter — the termites contact it and transfer it through the colony, eliminating it over weeks. Vikane (sulfuryl fluoride) penetrates an entire tented structure at calculated concentrations and dissipates completely. BoraCare penetrates into bare wood fiber and stays there for the life of the wood. None of these are available off the shelf — and that's by design.
The economics don't favor DIY either. "Using a product without a long-lasting residual barrier only invites termites back in a short period of time." Two years of repeat purchases later, the colony has been feeding the entire time, and you've spent more than the cost of a spot treatment with nothing to show for it.
One professional treatment, applied correctly, eliminates the colony. That's the comparison that matters.
Other Approaches That Won't Work
While we're here, a quick rundown of what else we hear from homeowners:
Bug bombs and foggers. Same fundamental problem as Raid, scaled up. Foggers fill a room with insecticide particles. They don't penetrate sealed wood. Termites inside galleries are never exposed to the active ingredient. The colony is unaffected.
Vinegar or citrus oil sprays from the grocery store. No demonstrated efficacy against established colonies. D-limonene — the active compound in professional orange oil treatment — works when injected under pressure directly into a confirmed gallery by a licensed technician. Spraying orange oil concentrate on your windowsill does nothing to the colony behind it.
Salt water. A folk remedy that has no mechanism for reaching a sealed gallery system. Salt doesn't penetrate wood in meaningful quantities.
Sealing the kick-out holes with caulk. If you found frass and plugged the exit holes, you didn't trap the colony — you just made it harder for your inspector to locate the active gallery. Drywood termite gallery systems have multiple openings, and the termites work around blocked exits. You've added a step to the inspection without addressing anything.
These aren't stupid ideas. They're logical first instincts from people trying to solve a problem with what's available. The issue is that drywood termite biology makes surface treatment physically unable to work.
Tonight, This Week, This Month
Not every swarmer sighting is an emergency. Here's how to calibrate:
Saw a few swarmers near a window or door: Low urgency, but schedule an inspection within the next 30 to 60 days. A small swarm near exterior wood could be swarmers attempting entry from outside — not necessarily an established internal infestation.
Saw a full swarm inside the house: Schedule this week. A large indoor swarm almost certainly means a mature colony is established somewhere in your framing. Our 5 warning signs of a termite infestation post can help you identify other indicators while you wait for the appointment.
Saw swarmers and found frass — the small hexagonal pellets drywood termites leave behind at kick-out holes: Don't wait. Active infestation is confirmed. Call now.
Saw swarmers after rain, near your foundation or coming from the soil: That pattern points to subterranean termites, which are a different species and require a completely different treatment. Schedule an inspection as soon as possible.
For any of these, the next step is the same: a free termite inspection that identifies the species, locates the infestation, and gives you a written assessment of your options. It takes about an hour. It's free. It's the only thing that tells you what you're actually dealing with.
The Raid did what Raid does. Now it's time to deal with the termites.
If you saw swarmers, you might also be seeing other warning signs you haven't noticed yet. Our 5 warning signs of a termite infestation walks through what to look for before your inspection.