In random samples of German cockroaches over the years, there were places where the roaches were resistant to almost every insecticide, including pyrethrin, organophosphorus, and even, mainly, DDT, which was so promising in the 1950s that it was eventually banned because of its serious harm to animals and humans. VITFE insect killer supplier Experiments have also shown that cockroach resistance can be passed on to the next generation; Once the cockroach phenomenon develops resistance, it is encoded in the genes and propagates over the generations. As cockroaches become more capable of metabolizing insecticide poisons, the dose needed to kill them must increase. Something similar happened to a strain of German cockroaches, which eventually increased production of an enzyme that allowed them to metabolize the drug, and thus developed resistance.
In addition to their natural defenses, cockroaches can quickly learn to stay away from areas sprayed with insecticides, SLEEP COOL insect killer manufacturer a behavior known as insecticide "repulsion." Although cockroaches are born with an aversion to light, they quickly learn to choose between dark (often cockroach-like), pesticide-sprayed areas and bright, pesticide-free areas. This is called associative learning.
We don't know how humans reacted when they first spotted cockroaches in their own habitat, but it may have been similar to modern humans. Over the centuries, humans have tried everything from rocks to glue to killing cockroaches. Some may succeed, but there is no one way to eliminate them, and that may never happen. Time has shown that cockroaches have the ability to change their bodies and behavior to accommodate human aggression. Chinese EASY ON Spray starch After the use of the most effective poisons, whether sprays, glues or powders, cockroaches develop resistance, and the most effective poisons are always less harmful to cockroaches and less harmful to human health.
Despite trying for so long and failing to kill cockroaches, humans still believe that if there are so many creatures as disgusting as cockroaches, there must be something that can kill them. There are countless products made for the purpose of killing cockroaches, some of which have limited effects, some of which are completely ineffective. Boric acid has been used since the mid-19th century and spraying boric acid powder near the baseboard works quite well. Boric acid is different from strong pesticides, which do not repel cockroaches, and cockroaches have never learned to avoid boric acid. Although boric acid has been used for a long time, the mechanism of killing cockroaches is still unknown, possibly the destruction of the foregut. Cockroaches die whether they eat boric acid while washing themselves or come into contact with it outside their bodies. Experiments have shown that boric acid can penetrate cockroach exoskeletons. Even though the American and German cockroaches have a layer of wax on their mouthparts, they will still die when exposed to boric acid powder.
Another powder with similar effects was nearly substituted for sodium fluoride in the first half of the 20th century in China, and its toxicity later proved to be more severe in humans. Today, sodium fluoride has completely disappeared, but boric acid continues to be sold and used.
There are several cockroach killing products on the market that are completely non-toxic to humans. Unfortunately, they are not usually effective at killing cockroaches either. Examples of this include electromagnetic devices that claim to alter the magnetic field around cockroaches, thereby disrupting their feeding and mating processes; There are also electronic vibrators, which use tiny vibrations to do this.