le Moustique-tigre, vecteur commun de maladies. © emodeath, Adobe Stock

Mosquitoes are attracted to these colors!

Every summer, there are those who are devoured by the bites of mosquitoes and female mosquitoes.
The female bites animals (and men) to feed on their blood.
To do this, the females have a special mouth apparatus to suck blood with a kind of…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/5/9/7 /5979f4fa2c_89354_shutterstock-tacio-philip-sansonovski.jpg” data-url=”https://news.google.com/planet/definitions/mosquito-insects-15677/” data-more=”Read more”>mosquitoes and those who survive. For scientists, there are three main reasons for this apparent injustice. ” I used to say that there are three main signals that attract mosquitoes: your breath, your sweat and the temperature of your skin. In this study, we identified a fourth signal », explains Jeffrey A. Riffelprofessor of biology at the University of Washington.

Mosquito bites not only cause itchy pimples, They are also a source of disease.. The experiments were carried out on Aedes aegyptia species mosquito vector of dengue fever, Zika, chikungunya virus (ChikV)
An alphavirus in the family Togaviridae (group A arboviruses), chikungunya virus (ChikV) is…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/6/ f / a/6fa3bf2456_104064_chikungunya-aedes-aegypti.jpg” data-url=”https://news.google.com/health/definitions/medicine-chikungunya-4143/” data-more=”Read more”>chikungunya and yellow fever. Infectious diseases wreaking havoc in tropical countries. These diseases are also transmitted by tiger mosquito (Aedes albopictus) who is present almost everywhere in metropolitan France and abroad.

Mosquitoes prefer red.

In their experiments, Jeffrey A. Riffel and his colleagues followed the flight path of a million female mosquitoes, the only ones that bite to feed their eggs, in a controlled environment. This is a two meter long test chamber where More…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/c/3/ 4/c3449c7cc8_49335_def-insect- mariea-flickr.jpg” data-url=”https://news.google.com/planete/definitions/classification-vivant-insect-2305/” data-more=”Read more”>insect You have a choice between two colored targets. The scientists followed the path of the insect thanks to sixteen cameras and a tracing 3D. It all starts with a jet of COtwoa gas odorless to humans but highly palatable to mosquitoes. Then, thanks to the camera system, the scientists were able to observe which target color the insects headed for first. They seem to prefer red, orange and black while white, green and purple leave them indifferent.

Thus, for mosquitoes, the color red would be the promise of a good blood meal. ” The red color is not only present in your clothes, it is also present in your skin. No matter the color of the skin, we all give off a strong red signature. Filter these Sometimes the color…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/9/5/7951943cc1_85596_color.jpg” data-url=”https: / /news.google.com/sciences/definitions/physics-color-4126/” data-more=”Read more”>colors attractive on our skin or avoiding wearing clothes of these colors could be another form of prevention based on avoiding negative disturbances or reducing their…” data-image=”https://cdn. future-sciences.com/buildsv6/images /midioriginal/0/7/0/070bdc60f3_50035320_amenagement-prevention-crue-clive-perrin-geograph-cc-2.jpg” data-url=”https://news.google.com /planet/definitions/sustainable-development-prevention-6509/” data-more=”Read more”>prevention mosquito bite “, continues Professor Riffel.

This preference for red is inscribed in the Genoa mosquito. Insects mutated by several genes became indifferent to red-orange stimuli. This also suggests that the observations made here are valid only for the species Aedes aegypti and that other mosquitoes may prefer other wavelengths. In conclusion, when a mosquito searches for food, it is first attracted by smell, before visually locating its favorite restaurant.

Mosquitoes have favorite colors too!

Article published on July 28, 2020 by Nathalie Mayer

Mosquitoes are among the main vectors of diseases that affect both humans and animals. And researchers have just made a discovery that could help better control this scourge. Depending on their work, mosquitoes are attracted or repelled by different colors depending on their species and the time of day.

“Conventional wisdom suggests that mosquitoes are attracted to ultraviolet light (UV), and this, in a non-specific way”says Todd C. Holmes, a professor at the University of California at Irvine (United States) in a release. Hence the widespread use of UV lamps to combat this scourge. “But our results show that things are much more complicated than that. »

the researchers in fact, they have studied the sensitivity of different species of mosquitoes to different types of white light
The wavelengths of visible light range from 380nm (violet) to 780nm (red). The visible spectrum is…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/b/6/9/b697a0c09f_85912_lumiere.jpg” data-url=”https:// news.google.com/sciences/definitions/physics-light-326/” data-more=”Read more”>light. Since Aedes aegyptithe mosquitoes of the yellow feverthey bite mainly during the day, and Anopheles Coluzzi, malaria vectors, which bite mainly at night. They found that the susceptibility of mosquitoes depends on their sex, species, time of day and color of light.

Fight mosquitoes more effectively

For example, daytime-biting mosquitoes, especially the females that need it for their fertilized eggs, are attracted to light during the day, regardless of its color. On the other hand, mosquitoes that bite night specifically avoid ultraviolet (UV) and the blue light During the day.

“By understanding how mosquitoes react to light in a species-specific way, we can develop new ecological alternatives to control insect pests more effectively. — usually — and reduce the need for toxic pesticides harmful to the environment»concludes Todd C. Holmes.

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