Site about the fight against domestic insects

At what temperature do lice and nits die

Вши и гниды довольно чувствительны к холоду и высоким температурам: давайте посмотрим, как этим можно воспользоваться при борьбе с паразитами

In terms of temperature stability, lice are much like bed bugs: these parasites are adapted to live only in very narrow temperature intervals. Lice die at a temperature that is no longer comfortable, but still tolerable, and therefore destroy them without the use of poisonous substances is quite possible.

But this requires a certain perseverance, as well as a knowledge of the technology of such a fight against lice, the important nuances of which we will continue to consider.

Temperatures that are dangerous to lice

Adult lice can survive for several days at temperatures from minus 5 ° C to + 40 ° C.

Вши начинают погибать уже при температуре ниже минус 10 градусов Цельсия

At temperatures that go beyond these limits, lice and their larvae die within a few hours. At temperatures above + 54 ° C and below minus 13 ° C, lice die within 5 minutes.

On a note

These temperatures are to some extent conditional. At high humidity, the temperature ranges at which lice survive are reduced, and at low - approximately correspond to the indicated values.

Already at a temperature of about 0 ° C and at + 42-44 ° C, lice are so weak that they can be easily shaken off the head or underwear. This is used in sanitation when combing lice with special crests.

При температуре +42 градуса вши настолько ослабевают, что их легко потом вычесать из волос


It is not necessary to interpret this data in such a way that if half an hour stroll in the cold at minus 20 ° C without a cap, then lice all at once all die. The hair covering on the person's head is created by nature in order to maintain a constant temperature at the surface of the skin. So, it is there that lice, although they feel discomfort, but do not die exactly. Forensic scientists know that lice begin to creep up only when the corpse has cooled to a temperature of about 20 ° C. In other words, if the body is warm - the lice around it will survive, no matter how much the person is tormented by the cold.

Practice shows that it is the easiest way to deal with ward lice with the help of temperature treatment. The main place of their presence is clothing that can be cooked and hung out for a few days in a hard frost. It is difficult to treat critical for lice by the temperatures of the person himself, but it is possible - for this, even today there are specially developed techniques, which will be discussed below.

At what temperature do the nests die

Nits ( louse eggs ) are generally more resistant to high and low temperatures. Even after exposure to deadly adult lice, the temperature of the nits may not die, and after returning to normal mode, larvae will be removed from them.

However, there are also critical conditions for lice eggs. Namely - nits die at a temperature below minus 20 ° C and above + 60 ° C. Almost instantly, nits perish at a temperature of about 100 ° C in steep boiling water during the digestion of clothing.

Бельевые вши и их гниды погибают при вываривании одежды в кипятке

Linen lice are dangerous just because if they do not use the clothes they have infected for a long time and store it at normal positive temperatures (even if they are near-zero), all adult lice on it will die of hunger, and nits will remain viable in the state of diapause. As soon as the clothes are dressed by a person, warming it up, the larvae hatched from the nits will be able to create a new population of parasites.

Нужно помнить, что из выживших гнид могут вылупиться новые личинки вшей

Given the reliable and strong adhesion of nits to the surface, even knowing at what temperature nits are dying and treating this temperature of the tissue, it is impossible to completely remove them - after the destruction, it will also require additional combing or cleaning of clothes.

The fight against clothing lice with the help of frost

Knowing at what temperature lice die, you can very effectively fight with lice. Do this usually in winter:

  • All the clothes that the infected wore are hung out in the frost for several days. It is desirable - for a week.
  • The infected person is thoroughly washed, his head is shaved or the combs are carefully combed out with special combs.

Вымораживание одежды - весьма эффективный способ избавления от бельевых вшей

It is important that the temperature at which things will freeze out is really very low - below minus 20 ° C. Nits perish at about this temperature, and after such freezing, there will be no chance for parasites to survive.

Freezing head and pubic lice is physically impossible without risk for the most infected person. To combat them, other temperature methods are sometimes used.

Lice removal by high temperatures

The excretion of lice on the body by high temperatures is quite laborious, but, as experiments show, it is quite effective.

The most revealing were the attempts of American researchers to develop a special dryer for the destruction of lice. This dryer blows the infected part of the body with air with a temperature of about 50 ° C, sensitive but painless for humans.

Специальный фен для уничтожения вшей

Особая насадка фена позволяет эффективно прогревать даже густые и длинные волосы

Фен от вшей в действии

Lice die at a temperature of about 55 ° C, and at 50 ° C they lose mobility and can not cling to the hair. Accordingly, half-hour treatment of hair with such a hair dryer allows you to immobilize and weaken the parasites, after which they shake and comb out of the head with special combs.

It is interesting

The very idea of ​​using a hair dryer against head lice was suggested by British inventor Dale Clayton. Initially, he developed funds from lice in the UK, but then moved to Salt Lake City, in a locality with a much hotter and drier climate. There he discovered that the local lice are much less viable, and after a long time in the sun in a dry desert air and completely lose mobility. This spodviglo him to create a special hairdryer.

Today, such hair dryers are not yet available for mass use, but those who decided to fight lice mechanically - with the help of crests - can take the method into service. Before combing out the hair, they should be washed in water with a temperature of about 55 ° C, and then dried with a normal hair dryer with the maximum tolerable temperature. Lice after this procedure will be combed out easier and in much larger quantities.

Перед вычесыванием вшей в домашних условиях можно использовать и обычный бытовой фен для волос


"I knew from the time of work at SES, at what temperature do louses die. It's somewhere 50 degrees. When lice appeared in the child, I did not even think of all insecticides - it's all poison. I did this: I just bathe the baby, then I dry his hair with a hair dryer at a temperature that is a bit unpleasant, but you can endure it for about 7 minutes. Then I immediately take and comb the hair with a comb from lice. It should be special, dense, with hard teeth. On the Internet, they are now selling a lot. Only lice and nits do not die at this temperature, but they are decelerated, and they need to be combed over the bathroom. "

Lyubov Ilinichna, Sterlitamak

How does the temperature affect the rate of reproduction of lice?

At the speed with which lice reproduce, the temperature also affects quite significantly. At temperatures below + 22 ° C and above + 40 ° C, larvae and nymphs of lice cease to feed and do not develop. At the same temperatures, there is no development of nits - they do not hatch larvae, although the nits themselves do not die, their development is simply inhibited.

Хотя при высокой температуре гниды перестают развиваться, однако они не всегда при этом погибают

At a temperature at which lice die, nits are still able to survive. In general, even a small change in temperature already affects the duration of the reproductive cycle of lice.

The optimal temperature for the reproduction of lice is + 30-32 ° C. Under such conditions, the period from egg to egg is about 16-18 days. Lowering the temperature to + 28 ° C stretches this period to 23-24 days, and at + 25 ° C from the egg to the egg it is already about 35 days.

At a temperature of + 22 ° C, larvae cease to hatch from the nits. So the mechanisms of natural protection of the population work - at low temperatures lice are not viable, and it is more rational to keep dormant nits before the next warming, than to risk withdrawing larvae that can simply die of hunger.

It is interesting that the increase in temperature at which lice live does not lead to the opposite effect. If the temperature rises to + 34-35 ° C, the reproductive cycle lasts at the level of 16-17 days, then at + 37-38 ° C the reproduction in lice practically stops, and after + 40 ° C they begin to die.

Вши начинают погибать уже при температуре выше +40 градусов Цельсия

In this case, under natural conditions, lice under such conditions are almost not found.

And how is it in nature?

Lice on humans in general rarely get into extreme situations - thanks to their activities, people can always be in comfortable conditions for themselves and for their parasites. Even if a person is in the cold or in extreme heat, hair or clothing protects both his body and lice from significant temperature changes.

The same is true of animals. Human lice on them do not parasitize, but they have their own analogues - withers very close to lice. Due to the dense structure of wool in animals, even among the inhabitants of the polar regions, the withers near the skin turn out to be quite tolerable conditions - under a dense undercoat, a temperature is maintained at which parasites can live and reproduce.

Власоеды на животных хорошо себя чувствуют даже зимой

In winter, under iced hairs, the withers, of course, slow down their activity, but by the summer they start multiplying again at normal speed.

In this respect, people are lucky - if they wish they can change their clothes, and shave their hair without the risk of being frozen or overheated. In the fight against lice, this advantage should be used.

To the record "At what temperature do lice and nits die" 30 comments are left.
  1. Sergey :

    There is a wonderful tool - NitFree spray, it scares off lice, and the comb of NitFree.

  2. Elmira :

    We were recommended by the pediatrician for the comb of Nit Free, explaining that only in this crest the distance between the teeth is less than the nits, and there are also special incisions, so lice and nits are easily removed. And you do not need chemistry before combing out, just wet your hair, the effect is one! We are very grateful to him, it took only two combing out, and after the second there was nothing, just in case.

  3. Amine :

    I have lice, I'm 13 years old. The best ways: hair dye, vinegar, dichlorvos or kerosene!

    • Roman :

      Yes, kerosene is the best means and cheap! The recipe is this: we buy half a liter of kerosene in the household. store, pour out on dry hair, thoroughly saturated with kerosene, and ignite. While kerosene is burning, nits, lice die.

  4. Guest :

    Roman, you have absolutely no constructive approach to solving this problem.

  5. Anonymous :

    Pouring the head with hot water 60-70 degrees, cool cold and again hot and again cold. After drying with a hair dryer (hot air), moisten with vinegar for prevention (not mandatory). Next, comb out with a small comb and, finally, wash the head in the usual way. Do not forget to wash clothes at high temperatures: lice and nits die after 55 degrees. I personally checked it!

    I believe that in the sauna (in the steam room), after turning a half hour, you can also roast both lice and nits. Did not check!

  6. Anonymous :

    There are ironing machines for straightening hair, I drew my hair straight and it's possible not to worry about nits)) Temperature 200. Probably, a curling iron for sucking hair will do.

    • Illuminati :

      Quite, they are afraid of high temperatures, about 60+, and there are more than 130, at least.

  7. Anonymous :

    I had lice, but my mother withdrew, and the nits remained. How to get rid of nits? I know that we need a crest, but the crest has not found anywhere (So, please advise.

  8. Guest :

    Hello. Help, lice for 4 months out. But I need folk remedies. Tell me, how about vinegar?

    • Anonymous :

      If you do not want chemistry, a very simple way - air conditioning and vinegar. You apply the conditioner on the hair with a thick layer and begin to comb out a small comb, while the comb must be periodically washed. Then rinse with vinegar. So repeat 1, 5, 9, 13 day. You need to do this twice a day. In those days when you do not use the air conditioner, wash your head with water 55-60 degrees, and after that again comb your hair with a small crest, preferably above the bathroom. And lice, and nits will not. Good luck.

  9. Alina :

    I do not know exactly if I have lice, but my head itches. Tomorrow I will go to the bath, there is 100 degrees.

  10. Light :

    The best remedy is Paraplus. Once and all. And it costs 800 rubles. I used it, I know.

    • Illuminati :

      The best way is not to live on this mortal land at all ...

  11. Alexander :

    Collided with these parasites, when a small one was in the camp picked up! We bought some shampoo against lice, 1 treatment was enough, disappeared. To this day I live without them.

  12. Elena :

    The best way is kerosene. You apply a cotton swab on the scalp, then it is processed completely along the entire length of the hair. You put a bag on your hair, and towel over the package. You sit an hour or two. How much you can endure, because you will burn and scratch it badly. But all lice and nits completely die. The nits are detached from the hairs. After such a procedure, neither nits nor lice will be.

  13. Sasha :

    We bought a pediculum, 500 rubles, in a set there is a scallop, a magnifying glass and a poison in the form of a spray. And in the childhood my grandmother brought us kerosene - a packet with a towel on the head and sleep, in the morning you will be happy.

  14. Olga :

    And chaerical water? About her, always remembered the last. To me, my mother, as a child, blew out and cleaned her hair with dust, the hair was always long, I was my petty - crooked water, and scratching, scratching, scratching.

  15. Anonymous :

    Why reinvent the wheel? In Russia, they always bathed in the bath, and there were no lice. It is enough to sit 10 seconds in a bath at 100 degrees. Tried it. Even the nits will dry instantly.

  16. Tanya :

    There is a saying: "Who is talking about, and the crummy about BANE" ... 😉

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