Why do mosquitoes come out in summer?

Male mosquitoes do not suck blood, but only plant juice. Blood-sucking mosquitoes are all females. Blood-sucking is to increase nutrition and reproduce. When they are full, they will find a place with water to lay their eggs.

Mosquitoes generally start to go out in May and reach the peak in the middle and late August. When the climate gets cold in autumn and the temperature drops below 10 degrees Celsius, we stop breeding, go into hibernation without eating, and come out after waking up the next spring. Our favorite temperature is about 30 degrees Celsius, which is unbearable. Our living and breeding environment must have water, so groundwater, gutter, sewer, people.

Mosquitoes choose their targets by smell.

Scientists' research shows that mosquitoes bite people selectively, and those who can bring mosquitoes rich cholesterol and vitamin B are most favored by mosquitoes. Mosquitoes use their sense of smell to find the object that suits their "appetite" best from the crowd. Cholesterol and vitamin B are essential nutrients for the survival of annoying insects such as mosquitoes, and they cannot produce these substances by themselves.

Mosquitoes have a strong sense of smell. When humans exhale carbon dioxide and other smells, these smells will spread in the air. These smells are like the bell for dinner, telling mosquitoes that a good meal is just around the corner. When a mosquito tracks a target, it always twists and turns with the smell of people's breath until it touches the target and then falls on the skin, patiently looking for a "breakthrough". Finally, directly insert the "needle tube" into the skin to suck blood for 8- 10 seconds.

Most cosmetics contain stearic acid (a fatty acid), so people who wear makeup are more popular with mosquitoes than those who don't wear makeup. As for a person's cholesterol level, it will not affect the judgment of mosquitoes unless there is enough cholesterol stored near the epidermis. Of course, there are also some odors that mosquitoes hate, such as bay leaves, citronella oil, citronella, garlic and geraniol.