The principle of electric mosquito-repellent incense is that the insecticide (pyrethrum essence) is sucked into paper and evaporated by hot air, and the general effect can last for 6 ~ 8 hours. The disadvantage is that the efficacy is not bad when used for the first time, and there may be "excessive", but after 4 ~ 5 hours, the pesticide will completely volatilize and the efficacy will become worse. The mosquito killing effect will be weakened. Using the capillary principle, the liquid electric mosquito-repellent incense that releases insect substances is continuously heated, which just makes up for the shortage of electric mosquito-repellent incense. The liquid electric mosquito-repellent incense can be used continuously for a long time, about 60 days, and even released regularly.
However, at present, there is still no evidence for the effective mosquito control days claimed by various manufacturers. ? The EPA has now required each manufacturer to submit relevant certification reports. In addition, according to the report of TEDA Institute of Public Health, electric mosquito coils not only release chemicals such as arsenic and toluene, but also contain many unknown harmful compounds. If used in a closed room, it may cause serious allergic phenomena, such as sore throat, stuffy nose and headache. Therefore, when using electric mosquito coils, it is recommended to keep the air circulating. Half an hour before going to bed is a good time to use electric mosquito coils. When in use, keep the doors and windows closed and away from people and pets.
culicifuge
The component of mosquito repellent-DEET (acetal, also known as taboo) has been recognized as one of the most effective mosquito repellent products for 40 years. Mosquito repellent can directly act on the tactile organs and chemoreceptors of mosquitoes to repel mosquitoes. Usually mosquitoes can smell the carbon dioxide produced by human respiration from 100 meters away. When the anti-mosquito liquid is applied to the skin, the medicine will evaporate with the body temperature, forming protective mold, which will keep mosquitoes from approaching.
When using anti-mosquito liquid, avoid spraying it directly on the wound or skin with rash; Don't spray it directly on your face, it is easy to irritate. You can spray it on your hands first and then rub it on your face. In addition, don't let children draw by themselves. Parents should spray it on their hands before wiping their children. In addition, DEET has the disadvantage that it is easy to damage plastics, rayon, feathers or lacquer paintings, such as glasses frames, walls, watches or other similar materials. Furniture, etc. It is best to avoid contact. If you are allergic to DEET, you can also use natural DEET mosquito repellent extracted from plants, but the action time is short, less than 2 hours.
In addition, the concentration of DEET in mosquito killing liquid has nothing to do with mosquito killing effect. The higher the concentration, the longer it stays on the skin, and the more likely it is to cause allergic reactions. For adults, it is recommended to use a mosquito repellent with a concentration of 10-30%. If you stay in a place with many mosquitoes for a long time, 40-50% DEET mosquito repellent is enough. As for the latest patents that are harmless to clothes and wool, such as KBR, recently passed by the US Environmental Protection Agency, they have maintained long-term efficacy, but it remains to be seen whether they are safe for long-term use.