Mosquitoes are a group of organisms belonging to their class composition Culicidae insects, the wings (Diptera).
They have a scaly wings, hard wings, thin body and long legs. Male mosquitoes sucking the sap and fruit to live, female mosquitoes suck the blood of humans and animals added. The size varies by species, but rarely larger than a few millimeters. The majority have a weight of about 2 to 2.5 mg. They can fly at speeds of 1.5 to 2.5 km / h.
Mosquitoes have existed on our planet about 170 million years. They Culicidae of the Order Diptera and contains about 2700 species, including Anopheles in 35 varieties, Culex, Psorophora, Ochlerotatus, Aedes, Sabethes, Wyeomyia, Culiseta, Haemagoggus, …
Mosquitoes grow mainly in swamps, ponds or other standing water. They lay eggs in the water, the eggs hatch into larvae called larvae or mosquito larva. Larvae live in the water for some time, then pupate, then morph into adult mosquitoes, flies out of the water.
The temperature suitable for the growth and development of mosquitoes is about 20 to 25 degrees C. So they appear in tropical countries, including Vietnam. The life cycle of the mosquito species and temperature dependent, ranging from a few days to about a month.
Females can tap special form could penetrate human and animal skin to suck blood. Sucking female mosquitoes need blood to add nguonprotein to produce eggs. Mosquito normal food is plastic plants and fruit, do not contain enough protein for females. Male mosquitoes do not have the appropriate nozzle to suck blood, and only eat the sap and fruit. Branch also has a mosquito, called Toxorhynchites, do not suck blood. [Citation needed]
Female mosquitoes suck blood objectives identified by smell and feel the heat. They are especially sensitive to animal breath CO² and some odor in sweat. Some people, for example, men, fat and blood type O, mosquitoes more attractive. Mosquitoes smell emits infrared rays from the object with high body temperature, so it is easy to find warm-blooded animals and birds.
Larvae or mosquito larva is a form of mosquito larvae, formed in the 2nd stage of the life cycle of the mosquito. Mosquitoes have four stages in the life cycle is the mosquito eggs, larvae (larvae), supply toss (pupae) and adult mosquitoes. Adult females spawn in waves
Once mosquitoes lay eggs, after 2-3 days, the eggs hatch into larvae. After hatching, the larvae do not grow continuously but underwent four different stages, including: At first, larval size of 1.5 mm and Wednesday at the age of it measuring approximately 8 – 10mm .
Larvae have no legs but have started developing their feathered government, swim with the movement of the body. Larvae eat algae, bacteria and microorganisms in the water. Where the warm climate, larval development time need around 4-7 days or longer without food. Then, when larval development Wednesday to age converted to provide a comma-shaped cast.
Measures to kill mosquito larvae do not reduce the number of mosquito bites immediately, it may take several days or weeks to reduce the number of mosquito bites. Kill mosquito larvae include various measures such as mosquito larvae Brass suit, changing of mosquito breeding sites, makes no larvae thrive, flourish are. To control adult mosquitoes to be the breeding ground. Fish and species eat other mosquito larvae in areas where mosquito larvae. Also can be used to kill mosquito larva chemicals. The intervention was aimed purpose is to reduce the transmission source
Employment in the area drained swamps, stagnant water, land clearing and other long-term measures to be implemented from the beginning of the 20th century in many areas has contributed very actively in the preventive measures and minimize the mosquito-borne disease. Kill mosquito larvae need to be done around the home of people within the larger scope intended to kill mosquitoes. For many species of mosquitoes, this is about 1.5-2 km range. These measures are not effective long-term need to be maintained throughout the duration of mosquito activity.
There are over 3,500 species of mosquitoes have been tissues. They are divided into 2 described subfamilies with 43 genera. This data may change due to the addition of new species or by the DNA studies.
A mosquito larvae, the larvae of mosquitoes. Larvae must often swim to the surface, take the oxygen in the air through a breathing tube in the tail. Most of us eat the microorganisms in the water to live.
Mosquitoes and health
Some mosquito species are capable of vector objects between people, or between animals and humans. The mosquito-borne disease that can cause high mortality include dengue, malaria, yellow fever …
In Vietnam, in the summer and the rainy season every year, the growth of mosquitoes often cause the diseases that killed many patients. In the summer of 2004, there were tens of thousands of people Vietnam infected with dengue fever, which has several dozen deaths, caused by mosquitoes. Worldwide, there are over half a billion people suffering from malaria annually, concentrated in Africa, with the culprit vector is the mosquito.
Lượt đọc: 780