What are the really useful mosquito repellent artifacts?

Mosquito repellent artifact: mosquito repellent bracelet (mosquito repellent sticker), mosquito repellent lamp, ultrasonic mosquito repellent (mobile phone APP), traditional mosquito repellent incense, electric mosquito repellent liquid, mosquito repellent toilet water and natural plants.

1, mosquito repellent bracelet (mosquito repellent patch)

All mosquito repellent bracelets, mosquito repellent stickers and mosquito repellent buckles on the market belong to this category of products that claim to use natural plant mosquito repellent ingredients to repel mosquitoes. These plant ingredients include castor oil, cedar oil, citronella oil, clove oil, geraniol oil, peppermint oil, rosemary oil and soybean oil. They are all natural ingredients and do little harm to human body.

The effect of such products is basically better than nothing. Theoretically, these mosquito repellent plant components have certain mosquito repellent effect, and mosquitoes don't like its taste. But it is also closely related to the concentration and distance of taste. The most important thing is that their mosquito repellent time is very short.

In other words, if you wear a mosquito repellent bracelet on your hand, maybe mosquitoes will bite your leg, even low-concentration mosquitoes will ignore it. According to several colleagues who have experienced it, such products sometimes play a certain psychological comfort role.

2. Mosquito repellent lamp

X treasures mosquito repellent artifacts, and the most common one is mosquito repellent lamp. The principle is to attract mosquitoes with ultraviolet rays and kill mosquitoes with power grids.

But is this really the case? Let's take a look at the experimental data: 1997, the laboratory in Florida, USA, was irradiated with ultraviolet mosquito killer for one night, and it was electrocuted 10000, among which 8 were mosquitoes. Most of the rest are close relatives of mosquitoes, chironomids and biting midges. 1982, scientists experimented with ultraviolet mosquito killer, and electrocuted 32 12 flying insects, of which only 3.3% were female mosquitoes.

1996, scientists caught 13789 flying insects with ultraviolet mosquito killer, of which only 3 1 was blood-sucking flying insects. These experiments can infer that the real female mosquitoes are blood-sucking, and ultraviolet rays have no effect on them.

Mosquitoes have no phototaxis, but are photophobic, because they are basically active at night. Where did you get the ultraviolet rays at night? Mosquitoes are actually afraid of light. As soon as you turned on the light, they hid. So ultraviolet rays can't attract mosquitoes at all, but attract other phototropic flying insects.

I am in high spirits every morning when I see so many "mosquito" bodies lying in the ultraviolet mosquito killer. However, you don't know that there are few mosquitoes that really suck blood in these bodies.

3. Ultrasonic mosquito repellent (mobile APP)

Mosquito repellent mobile phone software is a hot topic on the Internet this summer. It is said that it can emit ultrasonic waves of male mosquitoes to drive away female mosquitoes with thorns, which also makes many "acoustic mosquito repellent" on the market sell well. So is the acoustic mosquito repellent really true? Male mosquitoes will constantly emit sound waves of courtship, but pregnant female mosquitoes will try to avoid male mosquitoes because they don't want to repeat pregnancy. Mosquito repellent uses this principle.

"Sound waves" are actually sound waves generated by the vibration of mosquito wings. The vibration frequency of mosquito wings is about 250 to 1000 times per second, and its sound wave frequency range is basically between 250Hz and 1000Hz. However, the frequency of wing vibration is related to the species of mosquitoes, and this value varies from mosquito to mosquito.

It is a big joke that "the mosquito repellent generates ultrasonic waves similar to the flapping wings of male mosquitoes to drive away female mosquitoes". In order to create mosquito repellent effect, some products will make a "buzzing" sound, which is not only funny, but also annoying.

4. Traditional mosquito-repellent incense and electric mosquito-repellent incense liquid (mosquito-repellent incense tablets)

At present, the mainstream mosquito repellent active ingredients are: DEET, Pekaridin, mosquito repellent ester, eucalyptus citriodora leaf oil and methyl nonone. DEET, Pekaridin and mosquito repellent ester are mosquito repellent drugs recommended by the World Health Organization.

Traditional mosquito-repellent incense and electric mosquito-repellent incense (mosquito-repellent incense tablets) do not repel mosquitoes, but "kill" mosquitoes. The most effective component in mosquito killing products is pyrethroid, which is a kind of pesticide with high efficiency and low toxicity. Pyrethroids are called pyrethroids, and there are many kinds, such as permethrin, pyrethroids, cypermethrin, deltamethrin, D-trans -s- bioallethrin and so on. These ingredients belong to the pesticides recommended by the World Health Organization that can be used to control health pests and their vectors.

It has toxic effects on the nervous system of insects. First, the insect is excited, then the nerve conduction is blocked, and then the insect convulses, paralyzes and dies. Poisoning symptoms can be divided into two stages: excitation stage and inhibition stage, so knock-down rate and mortality rate are often used to represent the characteristics of each variety.

5, mosquito repellent toilet water

Toilet water, like perfume, is an aromatic substance based on ethanol solution (namely alcohol) and mixed with essence and other substances. In addition to the most basic functions of perfuming, disinfecting and cooling, toilet water can also be added with different functional components to make toilet water have specific functions. "Mosquito repellent" is a new function of toilet water that has only appeared in recent years.

Toilet water can not only repel mosquitoes, but also have other special effects. For example, adding a certain amount of salicylic acid and thymol to the flower dew water can play a certain role in bacteriostasis, itching relief and softening the cuticle, and can be used to inhibit the generation of miliaria. Menthol and borneol can not only make people feel cool, but also relieve itching and pain.

The biggest safety hazard of toilet water comes from its high concentration of ethanol, which itself is a flammable liquid. In the process of using toilet water, we should pay attention to avoid damage to skin and eyes. For people and babies who are allergic to alcohol, we should also pay attention to the amount of toilet water.

6, natural vegetation-psychological comfort

Common mosquito repellent plants are: mosquito repellent, mugwort, cordate telosma, cordyceps, lavender, Qilixiang and calendula. They have a certain mosquito repellent effect, but whether they are worn or smoked, the concentration is too low and almost ineffective.

The mosquito repellent effect of plants should be based on a certain planting density, the distance from mosquito repellent plants and the development degree of mosquito repellent plants themselves. In other words, what we require is that there are no mosquitoes, but mosquito repellent plants can only repel mosquitoes to a certain extent, which can't meet our requirements, so plant mosquito repellent is effective, but not reliable.

7. Apply for and take B vitamins

In recent years, the folk prescription that B vitamins can repel mosquitoes has been widely circulated on the Internet. Some people say that water mixed with vitamin B 1 and clear water can effectively repel mosquitoes; Others say that taking multivitamin B tablets a few days before playing can avoid mosquito bites …

Taking and applying B vitamins can prevent mosquitoes, which has been proved ineffective by many experiments. Whether spraying the aqueous solution of vitamin B 1 or eating vitamin B 1 directly, there is no mosquito repellent effect.

abstract

Comments all the way down, only the traditional mosquito-repellent incense, electric mosquito-repellent incense liquid (mosquito-repellent incense tablets) and toilet water are effective. Although other methods have some effect, mosquitoes are not so afraid because of the low concentration. In particular, the so-called invincible ultraviolet mosquito repellent lamp is not the mosquito you want to destroy.

Other ways can drive away some mosquitoes, but once bitten by several mosquitoes, you will feel that mosquito repellent is a failure. Probably can play a psychological comfort.

In fact, mosquito detection and target location mainly rely on carbon dioxide, heat, volatile chemicals and other factors. As for blood type, there is no reliable evidence that different blood types have different attractiveness to mosquitoes.