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Resistance. 'There are varieties of mosquito Anopheles, Culex, and so there.' Experiments carried out in a transparent glass cylinder, the 100 mosquitoes go into. 'The following points of repellent products, to observe the situation of mosquitoes fall.' For example, 100 mosquitoes, a 'half knockdown experiment' that is smoked down 50 observe the time required, in order to compare the two kinds of insect repellent products. Want to do such a 'mosquito knockdown experiment', the price is not cheap. 'One experiment is almost spent 5000 yuan.' How to choose a good repellent products 1. Which product performance? Mosquito coils quick, repellent film repellent liquid greener experts, mosquito coils is a generation of insect repellent products, the effect is good, but dirty environment is gradually being left out, and mosquito repellent liquid repellent film became popular. 'But when they first came out, because the heater, the mandrel design issues such as volatile mosquito is not perfect, affect the results.' In recent years, with the effect of improving the production process, tablets and mosquito repellent liquid gradually lift, slowly approaching the mosquito coils. 'Indeed, we have done the experiment, 100 mosquitoes, smoked down to half, 2-3 minutes mosquito coils, sheets and mosquito repellent liquid to be slower, about 3-4 minutes.' Gu Yongjun said. 2. natural ingredients safer? Plant extracts are not necessarily safer and less irritating a chemistry expert told reporters, such as lemon eucalyptus oil, which is the only repellent ingredient derived from plant extracts approved a US. However, the repellent effect is general. Generally it believed that under the same concentration, synthetic insect repellent effect was better than the plant extract, effective longer, and plant extracts is not necessarily safer and less irritating. Experts said that China is currently no standard for children mosquito coils. Abroad, and tips. For example, the Japanese regulations repellent DEET product content of up to 12%, less than six months the baby is disabled, 6 months -2 years old one day only once with 2 to 12 years old one day does not exceed 3 times; the US recommendation concentration of 10% -20%, is not available for infants under two months. (Original title:? China Sea Amoy mosquitoes resistant mosquito artifact out of order) edit: SN117 Wenling shoe factory collapsed victims rose to 12 people July 1, Guo Jingxing access