Adult fleas are five percent of the problem. The eggs, larvae and pupae hiding in carpet, bedding and soil are the rest. Why a single spray fails, what a growth regulator does, and the aftercare that makes the difference.
A single flea spray feels like it should fix the problem. It kills the adults on contact, the
biting stops, and a week later they are back. The reason is that what you saw jumping was only
about five percent of the flea population in your home. The rest, the eggs, larvae and pupae, are
hidden in carpet pile, bedding, cracks and yard soil, and a surface spray does not reach them.
The four stages
Understanding why one treatment is never enough comes down to knowing what you are actually
dealing with.
Eggs. A single female lays 40 to 50 eggs per day, and they roll off the host into carpet, bedding and furniture within hours. They are smooth, white and almost invisible.
Larvae are blind, worm-like, and about 2mm long. They avoid light and burrow deep into carpet fibres and soil, feeding on organic debris and adult flea droppings. They are nearly impossible to vacuum out of carpet pile.
Pupae. The larvae spin a sticky silk cocoon that traps carpet fibre and dust around it. This is the most resilient stage. Nothing short of physical removal kills a pupa inside its cocoon, and it can stay dormant for months.
Adults are the only stage you actually see. They hatch when vibration, warmth or CO2 from a passing host triggers emergence. They bite, breed and re-seed the cycle within 24 hours.
Why the cycle breaks with a proper program
A professional flea treatment does two things at once. The residual product kills adults and
exposed larvae on contact. The insect growth regulator (IGR) sterilises eggs and prevents larvae
from developing into adults. Together, they collapse the population within one generation cycle,
typically two to four weeks.
The IGR is the part a supermarket spray does not have. Without it, you kill today's adults and
tomorrow's hatch replaces them.
The fleas you see are five percent of the problem. The eggs, larvae and pupae you cannot see
are the other ninety-five.
Aftercare that makes the treatment work
Vacuum daily for at least two weeks after treatment. The vibration triggers pupae to hatch into the treated zone, and the vacuum removes eggs and debris.
Treat pets at the same time. An untreated pet re-seeds the house within days. Your vet and your pest controller should be working to the same timeline.
Wash bedding and pet blankets on a hot cycle. Anything the pet sleeps on is an egg reservoir.
Do not mop hard floors for at least two weeks. The residual product on hard surfaces needs to stay active.
Common questions
How long does it take to get rid of fleas after a treatment?
Expect full control within two to four weeks. The treatment kills adults and larvae on contact, but pupae in their cocoons are protected until they hatch. The insect growth regulator prevents new eggs developing, so the population collapses within one generation cycle. Seeing a few new fleas in the first week or two is normal and expected.
Do I need to treat my pet as well as the house?
Yes. Both need to happen at the same time. If you treat the house but the pet is still carrying fleas, they re-seed the carpets within days. Your vet can recommend the right product for your pet; the pest controller handles the house and yard.
Can fleas survive without a pet in the house?
Yes. Flea pupae can remain dormant in carpet for months, waiting for vibration, warmth or CO2 to signal a host is nearby. This is why tenants moving into a previously vacant house with carpet sometimes get bitten within hours of walking through the door.
Is the treatment safe for my baby who crawls on the carpet?
Once the treatment has dried and the re-entry time has passed, usually two to four hours, the risk is very low. The products are APVMA-registered for domestic use. Your operator should give you a clear re-entry time in writing before they start.
Common questions
How long does it take to get rid of fleas after a treatment?
Expect full control within two to four weeks. The treatment kills adults and larvae on contact, but pupae in their cocoons are protected until they hatch. The insect growth regulator prevents new eggs developing, so the population collapses within one generation cycle. Seeing a few new fleas in the first week or two is normal and expected.
Do I need to treat my pet as well as the house?
Yes. Both need to happen at the same time. If you treat the house but the pet is still carrying fleas, they re-seed the carpets within days. Your vet can recommend the right product for your pet; the pest controller handles the house and yard.
Can fleas survive without a pet in the house?
Yes. Flea pupae can remain dormant in carpet for months, waiting for vibration, warmth or CO2 to signal a host is nearby. This is why tenants moving into a previously vacant house with carpet sometimes get bitten within hours of walking through the door.
Is the treatment safe for my baby who crawls on the carpet?
Once the treatment has dried and the re-entry time has passed, usually two to four hours, the risk is very low. The products are APVMA-registered for domestic use. Your operator should give you a clear re-entry time in writing before they start.