What is an insect growth regulator? A substance that does not kill adult insects but stops their life cycle: eggs do not hatch, larvae do not develop, and the young never reach breeding age. It cuts off the next generation, which is why it is used with an insecticide that kills adults, not instead of one.
How does it work?
An insect grows in stages, and each stage needs a hormone and a new skin. A growth regulator disrupts one of them:
| Type | What it does | Result |
|---|---|---|
| Juvenile hormone mimic | Keeps the insect stuck at the young stage | It never matures or breeds |
| Chitin synthesis inhibitor | The larva cannot build its new skin | It dies at moulting |
Which insects is it used for?
- Fleas: stops eggs and larvae in carpets.
- Cockroaches: the young do not mature, and adults emerge with twisted wings and cannot breed.
- Flies: stops larvae at breeding sites.
- Mosquitoes: prevents larvae in water becoming adults.
- Stored-product insects and moths.
When do you need it?
- The infestation returns every month after each treatment.
- There are eggs and larvae ordinary insecticide does not reach.
- Fleas in rugs and carpet.
- German cockroaches in large numbers.
- Fly breeding sites you cannot remove.
When do results show?
- No dead insects on the first day, which is normal.
- Numbers start falling after two to four weeks.
- The effect lasts weeks to months, depending on product and place.
- A sign it is working on cockroaches: adults with crinkled or twisted wings.
How to use it
- Mix it with an insecticide that kills adults if the label allows, or apply it afterwards.
- Apply to breeding and hiding places, not into the air.
- For fleas: carpets, cracks and under furniture.
- For cockroaches: cracks, under sinks and behind appliances.
- For flies and mosquitoes: breeding sites as the label directs.
- Keep to the dose on the label.
Growth regulator vs ordinary insecticide
| Ordinary insecticide | Growth regulator | |
|---|---|---|
| Kills adults | Yes | No |
| Stops eggs and larvae | Usually not | Yes |
| Speed of result | Hours to days | Weeks |
| How long it lasts | Weeks | Weeks to months |
| Best | Both together | Both together |
Products from Orkida
- Starycide 480 SC by Envu
- Peroxy Larf insect growth regulator for larvae
- K-Othrine Partix by Envu (formerly Bayer)
- Eco Spray 8 L electric sprayer
Insect growth regulator FAQs
Is a growth regulator enough on its own?
No. Adults go on living and biting until they die naturally. It needs an insecticide that kills adults alongside it.
Why did I see no dead insects after applying it?
Because it does not kill directly. Its effect shows weeks later when the new generation fails to appear.
Does it work on bed bugs?
Its effect on them is weak. Bed bugs need a dedicated insecticide plus heat and steam.