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Every four or five years we should update the recipe on the insect repellent product packaging, we can see clearly marked 'chlorofluorocarbons permethrin content' 'propargyl permethrin content', for ordinary consumers, these words like hieroglyphics but for repellent products, these are the ingredients play a key role in insect repellent. 'Repellent products are pyrethroid compounds will be used in making pesticides on toxicity problems, because the content is very low, according to the national standard, qualified products should not be a problem.' Gu Yongjun introduction. 'Such compounds a long history, and it is continually updated,' Gu Yongjun, said the earliest a class is called pyrethroids permethrin, seventies and eighties of the 20th century started, is extracted from plants, crushed burned after having repellent effect. Subsequently updated for the rich D-trans allethrin, mainly in the mosquito coils. However, after a few years of each ingredient, its mosquitoes have developed resistance, and then use the same kind of mosquito, it has been unable to dispel mosquitoes, so insect repellent composition is also constantly updated. 'As our business in 2045 we will update once every recipe, from ES- Bioallethrin (EBT), a variety of ingredients mixed, PTFE ether pyrethroid, until now propargyl permethrin and chlorofluorocarbons phenothrin. 'Gu Yongjun told the modern Express reporter, currently chlorofluoroethers permethrin insect repellent effect is the best. Flowers 50,000 per year to do 'knockdown experiment' How do I know this year for existing mosquito repellent products whether or not a resistance to it? Gu Yongjun said that will carry out an annual market survey, if many consumers reflect product performance decline, unable to insect repellent, companies will get started the development of new formulations. Meanwhile, in order to compare different insect repellent effect difference between products, companies have to do every year nearly ten times 'Mosquito knockdown experiments.' Experiments are often arranged around August each year, each experiment were divided into two groups of 100 mosquitoes. 'These mosquitoes are the original drug suppliers, or get from the CDC, we ourselves have a short breed.' Gu Yongjun said that these are just the adult mosquitoes soon, has not suck blood, not smoked repellent products variety, the reason does not grasp now, because they can not judge these 'wild mosquitoes' what kind of ingredients that have been