Mosquitoes are possibly the most annoying insects onthe planet. Just remember their vile squeak and bites, in the place of which there is a reddening and intolerable itching - all this can easily infuriate even the most serene person. In fact, we are still lucky, because in Russia there are practically no mosquitoes that spread dangerous diseases. In other countries, such as China, these tiny creatures can infect humans with the deadly Zika virus or dengue fever in one bite. Effective drugs for these diseases do not yet exist, so scientists have only one way out - to destroy mosquitoes. This can be done with the help of radiation and biological weapons.
Of course, many types of mosquitoes can be fought.with a variety of chemicals. However, when it comes to such dangerous species as Asian tiger mosquitoes (Aedes albopictus), you can simply forget about the usual means against insects - these bloodsuckers simply are not afraid of them. That is why scientists use radiation and special groups of bacteria that do not allow mosquitoes to multiply. These radiations and viruses, if anything, are completely safe for humans.
- 1 Why bite mosquitoes?
- 2 Dangerous mosquitoes
- 3 How to get rid of mosquitoes?
- 4 The best mosquito repellent
Why do mosquitoes bite?
About this, few people know, but all the mosquitoes thatbite us, are females. They attack humans and animals only during their breeding, because they need the blood of mammals for the successful production of offspring. Males, in turn, feed exclusively on plant food, namely the nectar of plants. By the way, mosquitoes have recently learned to eat plastic.
From all this it follows that to reducethe number of bites infected with mosquito diseases, scientists need to prevent their reproduction. Ultimately, they will be able to completely exterminate the population of dangerous insects and release into the nature of healthy individuals. It is impossible to completely exterminate these insects, no matter how much one would like it - at the larval stage they are an excellent food for fish, and dragonflies and some species of birds feed on adults.
One of the most dangerous types of mosquitoes, likenoted above, are the Asian tiger mosquitoes. They differ from ordinary mosquitoes in black and white body coloring and in a more aggressive character. As a rule, they are found in China, Japan and Australia, but sometimes they are noticed even in Russia - in 2017 there were reports that they were seen in the Altai Territory.
Tiger mosquito Aedes albopictus
Mosquitoes become dangerous when they drink.blood in animals. The most dangerous diseases they suffer are Zika virus and dengue fever. When infected with Zika virus, a person has a headache, fever and a rash - the most terrible thing can happen to pregnant women, because after infection they can have children with developmental disabilities. Dengue fever is also accompanied by a rash and can cause psychosis and other serious conditions.
How to get rid of mosquitoes?
The most effective way to destroy a populationdangerous mosquitoes are considered to be deprived of their ability to multiply. One of the ways to sterilize males is radiation — by releasing thousands of such insects into nature, scientists can fool females that will mate with barren individuals. In the end, the females simply die of old age, without biting people or producing offspring. However, quite often females feel irradiated males and prefer to mate with healthy ones, therefore this method is far from the best.
See also: Scientists want to use bacteriological weapons against mosquitoes
Also, scientists create barren mosquitoes, infectingtheir bacteria from the genus Wolbachy. If a healthy female mates with a male infected by this bacterium, she will also fail to produce offspring. But this method also has a big minus - if the female is also infected, she will easily continue the mosquito population. Another drawback is the need for careful sorting of females and males, because by infecting individuals of both sexes and releasing them into the wild, scientists can only aggravate the situation and provoke infection of even more people.
The best mosquito repellent
To get rid of all the flaws, scientistsdecided to use both methods of getting rid of mosquitoes. At first, they irradiated mosquitoes of all genders with weak radiation - females are more exposed to radiation, therefore they became infertile. Males remained unharmed, and therefore equally attractive to the opposite sex. So that they also become barren, scientists have infected the entire group of insects with bacteria - the lack of the need to separate insects by sex allowed us to release up to 160 thousand infected mosquitoes at a time. Yes, the females were also infected and in the usual situation mating with sick males would give offspring, but in this case they were exposed to radiation, which means they were sterile.
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Thanks to this tricky method, scientists have succeededrid of dangerous mosquitoes as much as two river islands in the Chinese city of Guangzhou. The number of mosquito bites decreased by as much as 97%, because in six weeks scientists had not met any mosquitoes. Viable mosquito eggs have not been seen for a full three months.
Probably, this approach will be applied in otherparts of the world, including in Africa. The method is simply excellent, because it does not harm people. Of course, at first the locals may negatively react to scientists, who release huge flocks of mosquitoes, but after seeing such stunning results, they will surely calm down.
Also take a look at this: A genetically modified fungus could kill 99% of anopheles mosquitoes
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