Why do environmental pesticides kill insects?

Why do environmental pesticides kill insects?

Taiwan Province has a hot and humid summer, which is the most ideal climate for mosquito breeding. SLEEP COOL insect killer supplier Common vector mosquitoes in Taiwan, such as Culex tritaeniorhynchus and Aedes aegypti, can transmit diseases such as Japanese encephalitis and dengue fever. To prevent the infestation of mosquitoes and cockroaches, ordinary people often use easily available products such as electric and mosquito coils. You may have seen the city office spray insecticide along the drainage holes of the block.

Electric mosquito-repellent incense, insecticides, these indispensable chemical weapons in daily life, is the so-called "environmental medicine". Chinese EASY ON Spray starch manufacturer But how much do we know about these ubiquitous chemicals? What are the effects of environmental drugs on human health? What will it do to the environment?

For insects, pesticides are their nerve gas

Insecticides can be divided into three levels according to their stunning ability: strong fast-acting agents, Chinese EASY ON Spray starch supplier medium fast-acting agents and slow acting agents [1].

A large class of chemicals used in highly effective and environmentally friendly medicines are pyrethroids, which are structurally similar to pyrethroids that can be extracted from specific chrysanthemums, usually ending in -thrin, which translates to Oo Ning in Chinese. Common compounds include mefluthrin, Prallethrin, Cyphenothrin and so on.

The three compounds, from top to bottom, are Mettenin, Projalin, and Cyprin. Figure u002FEdgar181@Wikipedia, CC0, Figure u002FFvasconcellos @Wikipedia, CC0, Figure u002FEdgar181@Wikipedia, CC0

From the figure, we can see that the middle structure of the three compounds is similar, but the sides are different; In fact, it is the difference between these two "substituents" that makes the drug act slightly differently.

Compared with camphor, peppermint and other drugs only "insect repellent" effect, pyrethrin can effectively "destroy" mosquitoes, this is because it has a nerve axonal excitatory toxin, into the insect body, can open the insect membrane on the sodium ion channel and increase the conduction function, so that the nervous system is too excited, and finally paralysis and death.

Pesticides stink and could be bad for you?

At this point, there must be some concern: Should substances that can kill mosquitoes also cause harm to humans? Of course, manufacturers have taken this into account, and one of the key points of environmental drug development is trying to target only the target organism. In terms of insecticides, pyrethroids are extremely toxic to arthropods, but less toxic to Vertebrata such as humans.

Even so, if the skin is exposed to high concentrations of pyrethroids or pyrethroids over a short period of time, it may itch, burn, or sting. If high concentrations of pyrethroids or pyrethroids are inhaled or ingested over a short period of time, it may cause dizziness, headache and even loss of consciousness. Therefore, everyone should pay attention to dosage and keep ventilation when using drugs in the environment.