Every summer, in addition to mosquitoes, the most annoying thing is cockroaches! This magical creature with a very low appearance and a slightly frightening appearance has been haunted at home for many years, and what is even more frightening is that many times you still have no way to take it, and can only let it provoke it wantonly.
The pervasive cockroach has long become a national pain point. In terms of knowledge, the topic of "cockroaches" is also hot.
Some friends opened their minds and thought of the following hard-core brain hole problems:
There are also many friends who share their horror experiences caused by cockroaches:
But more people are desperately looking for ways to kill cockroaches effectively:
Just as the so-called know-it-all knows that the other is invincible, before we want to destroy the cockroach, we must understand who the cockroach is.
01
Those cockroach cold knowledge that you don't know
Cockroach, scientific name cockroach, a creature that lived longer and longer than dinosaurs. According to fossil evidence, the most primitive prehistoric cockroaches appeared on Earth about 400 million years ago. The reason why it can survive for so long has a lot to do with its super reproductive ability and survivability.
Cockroach fossils
The normal lifespan of cockroaches is about 1 to 2 years, males can mate many times in their lives, but females only mate 1 or 2 times, 1 mating and fertilization, you can finally produce eggs, a fertilized female cockroach, after one year can breed 20,000.
Some cockroaches, such as the American cockroach, can also reproduce asexually, and the small cockroaches that are born are also female, which shows how powerful the reproductive ability of cockroaches is.
Cockroaches also have a strong ability to survive. A British scientist once did an experiment: he cut off the head of a pregnant female cockroach, but surprisingly, this headless cockroach not only survived, but also lived for more than a month, and also gave birth to several small cockroaches...
Because its circulatory system is an open-tube circulation, there is no blood circulation system, the head and trunk are not tightly connected, and the nerves that are in charge of breathing are in the abdomen, so even if it is cut, it will not die directly.
Another experiment was done to test whether cockroaches could survive underwater. As a result, the cockroach was active in the water for an hour and a half before it stopped moving, but after fishing it out, it moved again in less than 5 minutes. So those who once flushed a cockroach directly into the toilet, it is likely that it just swam to someone else's house.
Because the life force of the cockroach is too strong, many people have repeatedly lost battles and battles with it, and finally become a "Buddhist cockroach". But cockroaches are not just a visual and psychological impact on you, it has great potential harm to human health.
02
What are the hazards of cockroaches to human health?
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Answer: Ma Nature (300+ approved, dermatologist)
Among the common allergens in the human body, there is one that is extremely harmful to the human body and can be actively avoided, that is, cockroaches. Cockroaches are extremely vigorous and suitable for survival in warm, humid and food-rich places, and their secretions and corpses are the main causes of sensitization.
1. Eczema: shown in a multicenter study. Among patients with eczema dermatitis, the highest proportion of all positive allergens is the cockroach.
In China, cockroaches as allergens have not attracted enough attention, and some medical institutions do not contain cockroaches in allergen testing.
2. Urticaria: The etiology of chronic urticaria is complex, and a considerable number of patients with chronic urticaria reported at home and abroad are related to inhalation allergens. Intradermal tests have reported higher rates of positive skin tests in chronic urticaria in dust mites and cockroaches.
3. Asthma: positive allergen of German cockroach is a strong pathogenic factor for asthma.
4. Allergic rhinitis: allergic rhinitis (AR) is an IgE-mediated nasal mucosal immune response after the allergic agent acts on the body, which is manifested as nasal congestion, runny nose, nasal itching, sneezing and other symptoms.
Cockroaches also occupy a place in the top 10 allergens in AR patients, with a positive rate of 28.4%, suggesting that long-term and effective cockroach control is also an important way to prevent AR.
5. Serum IgE of patients with senile allergic diseases shows that the top three with the highest positive rate are mold, house dust mites and cockroaches, so the elderly should pay attention to them in their daily lives and try to avoid contact with mold, house dust mites and cockroaches.
6. Spread pathogenic microorganisms and parasites. For example, malaria bacillus, Pseudomonas aeruginosa, Proteus, Salmonella, Typhoid bacillus, a variety of viruses, mold and other pathogenic microorganisms.
Another example is Trichomoniasis, also known as superflagellus, which is a single-celled protozoa that parasitizes the intestines of termites and cockroaches, and can cause lung infections in people, and even has been reported to cause intrauterine infections.
7. Cockroaches themselves can cause disease, such as cockroaches burrowing into the external ear canal, causing foreign body infection and inflammation of cockroaches in the external ear canal.
In order to eliminate cockroaches in the home, many families have begun to use a variety of cockroach products, even imported products, but the effect is not satisfactory, why is this happening?
03
The incidence of cockroaches faced by chinese and foreign households varies
Respondent: Li Lei (200+ approved, excellent answerer on biological topics)
In order to kill cockroaches, countries around the world are developing various cockroach removal methods, such as typical of various cockroach drugs. However, many people have also found some problems, that is, some drugs work well in other places, but it is difficult to work in China, resulting in the problem of cockroaches is difficult to eradicate.
Take Germany, which is more serious about cockroaches, as an example, Germany was an early country that was seriously affected by cockroaches, so the cockroach species at that time was also called german cockroaches (Blattella germanica, in fact, Germany is also a victim, and German cockroaches did not originate in Germany). The cockroaches that are raging in Germany are German cockroaches, so Germany has effective drugs specifically for the corresponding cockroaches.
However, this situation is still different from the cockroaches faced by China, but an important factor lies in the impact of regional climate differences. Germany and most of our country are not in the same dimension, Germany is a high-latitude country, Germany's southernmost place (N47 ° 15) is more north than China's Harbin (N45 ° 45), Germany's climate type is also significantly different from China.5
In addition, there are differences in living conditions and family health conditions in different regions and national household health awareness, such as cockroaches and kitchen waste disposal in China, which have a high correlation, and a wide range of kitchen waste treatment methods have not yet been formed in China.
Coupled with the difference in the awareness of cockroach protection, the varieties of cockroaches have certain differences. For example, in the distribution of cockroaches in China, the German cockroaches of the genus Small Cockroaches are the majority in the northern region, and the composition proportion of the genus Macropyrifos is low; although all kinds of cockroaches can be found in the southern region, the composition ratio of the genus Macro cockroaches is high.
This difference in cockroach species, coupled with the strong adaptability of cockroaches, the result is that with the same drug, the effect is different in different regions.
China's cockroach is not a kind of German cockroach, in fact, it also includes the American cockroach, two kinds of cockroaches belong to the same cockroach family, but belong to different species, there are obvious differences between the two.
Morphologically, for example, the American cockroach is significantly larger than the German cockroach, the former is about 3-5 times the size of the latter; in color, the former is light reddish brown, and the latter is light brown.
In addition, there are also differences in its incubation cycle and growth cycle, and the needs for the environment are different, in this case, it is difficult for the two to use the same drug to kill, so for the domestic cockroach situation, it is necessary to use drugs for two kinds of cockroaches at the same time.
American cockroaches and German cockroaches respond differently to the insecticide Fipronil