Are cockroaches poisonous? What harm do cockroaches do to people?

The common name of cockroach is also called "cockroach".

Insecta Blattella

Overall characteristics: flat body, dark brown, usually of medium size. Small head, move. Antennas are long and filiform, and compound eyes are developed. The wings are flat and cover the back of the abdomen; Some species have no wings. Not good at flying, can run. Not completely perverted. Lay eggs in the egg sheath. There are about 2250 species, mainly distributed in tropical and subtropical regions. Live in the wild or indoors.

Cockroach is one of the oldest insects on the earth, and once lived in the same era as dinosaurs. According to fossil evidence, primitive cockroaches appeared on the earth about 400 million years ago in Silurian. The cockroach fossils we found or cockroaches found in coal and amber are not much different from the cockroaches in your cupboard. For hundreds of millions of years, its appearance has not changed much, but its vitality and adaptability have become more and more tenacious, and it has been widely distributed in every corner of the world until today.

According to the ecological habits of cockroaches, a biologist once came to a conclusion: if there is a global nuclear war on the earth one day, all creatures in the affected area, including humans and even fish, will disappear, and only cockroaches will continue their lives! This is because under normal circumstances, the radiation that the human body can bear is 5 rem, and once the total radiation exceeds 800 rem, it will die. Blattella germanica can tolerate 9000- 105000rems, and Periplaneta americana can tolerate 967500rems! So cockroaches can survive even if there is a nuclear explosion. At present, the U.S. government spends1500 million dollars to eliminate cockroaches every year, which is about twice the budget for AIDS prevention and control.

Most of them look the same, but if you look closely, you can still see the difference. At present, taxonomists divide cockroaches into about 6,000 species, of which about 50 species are pests, such as common Asian cockroaches. In addition, Periplaneta americana, Blattella germanica, brown cockroach and Australian cockroach are also widely distributed. There are about 200 species in China, and the common indoor cockroaches are about 10, which varies from place to place. Blattella germanica and Periplaneta americana are common.

Blattella germanica is very small, about 10- 15mm long, and its adult is brownish yellow, which is a common dominant species in northern China. In addition to being distributed indoors, it is also the dominant species in restaurants, restaurants, hospitals, ships, trains and passenger planes.

Control of Blattella germanica

Blattella germanica has been in China for nearly 20 years, and has spread from a few big cities to almost all small and medium-sized cities, even small market towns and rural areas. According to the data of the National Center for Disease Control and Prevention, a female cockroach can breed up to one million offspring a year. With the extensive use of pesticides for control, Blattella germanica has developed strong drug resistance, and most pesticides are ineffective. At present, cockroaches have replaced mice as the first of the four pests! Now scientists in China have developed an environmentally-friendly, safe and efficient biological cockroach killing method-"Poison Island" biological cockroach killing bait. The mechanism of action is: using cockroach virus to create cockroach plague! The National Center for Disease Control and Prevention has now been extended to the whole country ... China has taken the lead in this field!

Periplaneta americana is a dominant indoor species in southern China, with a large body size of about 30-40mm, which is distributed in dark and humid environments such as sewers, heating ditches, toilets, bathrooms, breweries and sauce factories.

The scientific name of cockroach is cockroach. It has a chewing mouth and can chew food. Cockroach's food is very complicated, ranging from ordinary food to brushes for shoeshine, including wire rubber, cardboard, soap, paint scraps, dead leaves, textiles, leather, hair and so on. Entomologists have found that there are 12 species of cockroaches that can live on paste for one week, while American cockroaches can live for one month only by drinking water, and for three weeks without eating or drinking. When food is short or space is crowded, cockroaches will devour each other.

Cockroaches are good at crawling, swimming and flying in times of crisis. Cockroaches are good at living in tiny cracks because of their flat bodies. As long as there is water and food, they can live almost anywhere. If the conditions are not good, you will not die if you don't eat or drink for a long time. With the appearance of the above characteristics, the number and distribution range of cockroaches are increasing day by day, and they have become the number one household pest.

Cockroaches like the dark and fear the light. They like to go out at night on their stomach during the day and occasionally see them during the day. Generally, after dusk, they start to climb out for food and return to their nests in the morning. The temperature is most active at 24-32℃ and completely inactive at 4℃. In the tropics, cockroaches can breed and move all year round. In northern China, if the indoor temperature is suitable in winter and there is heating equipment, cockroaches can move and reproduce as usual. Cockroaches are mostly oviparous, and their eggs are arranged orderly in the egg sheath, which can resist the influence of adverse environment and is not easy to be killed by chemical drugs. When conditions are suitable, they can hatch larvae.

Cockroaches have a strong reproductive ability. After the male and female cockroaches mate, the female cockroaches will grow a pod-like thing on the tail, called an egg sheath, in which the eggs are laid. A few females can produce more than 10 and more than 90 egg sheaths. In an egg sheath, at least 10 cockroaches can be hatched, and at most more than 50 small cockroaches can be hatched, which is related to the species of cockroaches. In the eastern United States, there are more than 1000 cockroaches living in an average house; And a pair of Blattella germanica can breed 100,000 offspring in just one year! It takes about 15 days for the eggs of cockroaches to hatch in the egg holder. The newly hatched cockroach is a milky nymph without wings. Like other kinds of insects, it must shed its skin when it grows up. After molting for 3-4 times, wing buds can be seen. Blattella germanica needs 6-7 molts to reach the adult stage of sexual maturity, while Periplaneta americana needs 10- 12 times. The growth and molting time of cockroaches are closely related to climate factors and food acquisition. Usually this process is completed within two months.

Spiders, scorpions, ants, parasitic flies, parasitic bees, toads, lizards, birds and mice are common natural enemies of cockroaches. However, Blattella germanica is an exotic species in China, and no effective natural enemy has been found yet. Coupled with its unique high fertility, it has quickly become the first of the four pests in China in recent years.

Most cockroaches living in the wild feed on decaying organic matter or litter. Cockroaches living in houses like starchy food. They often leave pathogenic organisms on the food they climb and spread diseases. Cockroaches have the bad habit of eating, spitting and excreting, polluting food and spreading many diseases, such as dysentery, paracholera, hepatitis, tuberculosis, diphtheria, scarlet fever and ascariasis. No matter what kind of cockroach it is, the pathogens it spreads are typhoid Bacillus, dysentery Bacillus, Escherichia coli, tuberculosis Bacillus, anthrax Bacillus, gall fungus and eggs of tapeworms, ascaris, schistosomiasis and so on. Cockroaches also secrete and excrete odorous substances, which make people feel sick and even vomit after smelling them. The Thai government has announced that it will no longer allow the sale of a "giant cockroach" originating in Madagascar in the name of a pet, and it is also prohibited for ordinary individuals to own it.

Cockroaches are moderate in size, easy to raise and have strong reproductive ability, and have long been the favorite experimental objects of biologists.

Remove cockroaches

1, carefully check sewers, wall cracks, floor partitions and windows to prevent cockroaches from entering.

2, keep the room dry, cockroaches live in a humid environment, so you should be careful not to have any water leakage, especially in the kitchen.

3. Keep the room clean. In a clean and dry environment, cockroaches will feel unwelcome. After eating, the food should be sealed in time, the garbage in the ground and garbage bags should be cleaned in time, and the tableware should be washed with hot water first. Dirty tableware will attract the attention of cockroaches. In addition, stoves and other places should be cleaned regularly.

4. Kill cockroaches with pesticides when no one is at home (but biological cockroaches don't need people to leave).

Chinese herbal medicine

Most people hate cockroaches, and some people will spend a lot of time and energy to get rid of them. But few people know that cockroaches can also become wealth.

Eupolyphaga sinensis is a kind of cockroach and the first cockroach that can be recognized as a medicinal material.

The truth of cockroaches is clear: only 1% species are pests.

In the eyes of most people, the annoying cockroach is full of evil, but we all misunderstand this animal. In fact, most of them are not pests, and only about 50 species are pests. In order to make people fully understand the big family of cockroaches, George Beccarioni, a cockroach expert at the Natural History Museum in London, collected the introduction and information about cockroaches on 1862-197 1 and compiled it into the database. The London Museum of Natural History published the data and information of all cockroaches in the world online for the first time this month. Some wonderful information is summarized as follows:

The heaviest cockroach in the world: the Australian rhinoceros cockroach is the heaviest cockroach in the world, weighing 30 grams, equivalent to the weight of three adult blue-crowned tits.

The smallest cockroach in the world: Attaphila fungicola in North America, only 3 mm long, only slightly longer than the red ant.

The largest cockroach wingspan: the giant-bellied cockroach in South America and Central America, wingspan185 mm.

The most screaming cockroach: the hissing cockroach in Madagascar. This African cockroach is 3 to 4 feet long (1 foot) and about 1 foot thick. This cockroach will hiss when you pick it up. Out of curiosity, some people keep this giant cockroach from Madagascar as a pet, and the price is 50- 100 yuan each. More interestingly, this acoustic cockroach was lucky enough to take the "Space Hotel" No.2 test module-"Origin II", which was launched by a Russian rocket on June 29, successfully entered the scheduled orbit and made a space trip.

Cockroaches can live for a week without their heads. Understand why insects such as cockroaches can survive without heads, and you can understand why humans can't. If a person's head is cut off, it will immediately bleed, blood pressure will drop, which will hinder the transmission of oxygen and nutrients and cannot supply the tissues needed to sustain life. In addition, people's breathing depends on the mouth or nose, and these functions are controlled by the brain, so cutting off the head will stop breathing. Besides, human beings can't eat without brains.

But the blood pressure pattern of cockroaches is different from that of humans. Cockroaches don't have a huge vascular network like humans, and they don't need high blood pressure to ensure that blood can reach capillaries. They have an open circulatory system and don't need much blood pressure. When you cut off their heads, the wounds on their necks will quickly solidify due to the action of platelets to avoid massive bleeding. In addition, cockroaches breathe through valves-they have small holes in every part of their bodies. Plus, they don't need to control respiratory function through the brain, and blood doesn't need to deliver oxygen. They can only breathe air through the valve tube directly through the catheter.

Cockroaches are cold-blooded, which means they need much less food than humans. In other words, they can last for several weeks after eating a meal. As long as you don't meet predators and the wound is not infected by bacteria or viruses, you can survive.

Interestingly, Mike Bohdan, an American pest control expert with more than 20 years of experience, opened a cockroach celebrity memorial museum in his pesticide retail store, which specializes in collecting cockroaches wearing various small clothes. These cockroaches are all dead. They wear clothes that show various themes. For example, one of the cockroaches, wearing a white mink coat, sat in front of a small piano, representing American pianist and professional actor Libers. You are not afraid to see these cockroaches.