Insect pulse VS insect barrier
The insect barrier is usually a pyrethrin-based insecticide or pyrethrinoid derivatives (e.g.deltamethrin). Its main role is to kill all insects that arise on it (ramping or flying), but it can also have repulsive action on some insects such as mosquito (repellent effect with remote deterrent effect: microparticles of suspended insecticides in the air).
Depending on the support on which it is deposited, it can be effective from a few days to a few weeks (up to 6 months for impregnated clothing or nets).
These products are effective. But even if they have a repulsive action, it is primarily insecticides that will not make the difference between a mosquito and a coccial. So be careful using them!
Unlike the insect barrier, the insect repellent has no insecticide action, it only pushes insects from the treated surface.
In synthetic products, we find mainly: DMP, EHD, IR3535, DEET, KBR 3023
They are usually used in body insect repellent with a protection of a few hours, but can also be used for tissue or mosquito net treatment (DEET).
Repellants of natural origin are also made from essential oils (citronal, lavender, cedar, eucalyptus, pine, etc.). This efficiency, of course, depends on the composition but mainly on the concentration in active principle.
Effectiveness of insect repellants: Whatever product you will use, (insect rear, insect repulsive, synthetic or natural), you will not be able to prevent insects from entering a house whose windows are open by treating only frames. Indeed, the repulsivity of these products rarely exceeds a few dozen centimeters.