It is a pest.
cockroach
Pinyin: zhāngláng
Common name: Mrs. Huang
Scientific name: Blattella
Biological characteristics of cockroaches
Cockroaches are divided into Insecta and Cockroach. Sometimes called the family Blattidae.
Cockroaches are flat, dark brown and usually of medium size. Small head, move. Antennas are long and filiform, and compound eyes are developed. The wings are flat, the front wing is cortical, the rear wing is membranous, and the size of the front and rear wings is basically the same, covering the rear 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 6000 species (more than 2250 species), mainly distributed in tropical and subtropical regions. Live in the wild or indoors.
Insects such as cockroaches originated in Devonian, and scavengers prefer nocturnal activities and live in caves. It has withstood the test of extreme heat and cold and is widely distributed so far. 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 cockroaches in various cabinets. 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. It is worth mentioning that a decapitated cockroach can live for 9 days, and the cause of death after 9 days is excessive hunger.
Edit this strange cockroach.
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 annual cost of cockroach eradication in the United States is $6,543.8+$0.5 billion, 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.
Periplaneta americana is 30 ~ 50 mm (up to 2 inches) long, reddish brown, and lives outdoors or in a dark and warm indoor environment (such as a basement or a room with a stove). The adult period is about 1.5 years. Female worms can lay 50 or more eggs, and each pod contains about 16 eggs. After 45 days, the nymphs hatch. The nymph stage is 1 1 ~ 14 months. American cockroaches are native to tropical America and subtropical America. They have well-developed wings and can fly long distances.
Blattella germanica is a common indoor pest. Light brown with two black stripes on the chest, the female lays eggs 3 days after mating and carries them for about 20 days. Small size, about 12 mm (less than 0.5 inch) long, so it is often taken home by bagging or boxing in grocery stores. Shipped to all parts of the world. It can produce three or more generations a year. German cockroaches are abundant around the water pipes of croton aqueduct in new york, so they are commonly known as croton bugs.
The cockroach (Supella supellectilium) is similar to Blattella germanica, but slightly smaller. The wings of the male body are well developed, the body color is slightly lighter than that of the female body, and the wings of the female body are short and have no function. There are two light stripes on the back of both sexes, and the life span of adults is 200 days. There can be two generations every year. Eggs can be laid in clothes, planks or cracks in the floor. With the emergence of houses with heating equipment, cockroaches with brown belts also appear in cooler areas.
The oriental cockroach is considered as the dirtiest domestic pest. The body is oval, black or dark brown, shiny and 25 ~ 30 mm long. Life history is like American cockroaches and male wings ... >>
Are cockroaches beneficial or harmful?
The truth about cockroaches is clear: only a few 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:
Cockroaches are the best;
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.
The secret of cockroach's headless existence;
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.
Cockroach Museum:
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.
Cockroach's biological clock:
The learning ability of cockroaches varies greatly in the morning and evening. This is the first research report that proves that the learning ability of insects will be affected by biological clock, which will undoubtedly help people to study the role of biological clock in depth.
The study was led by biologist Trier. The page of Vanderbilt University, USA. He and his research team trained cockroaches to associate their unpleasant mint oil smell with their favorite vanilla smell, and trained them at different times of the day for 24 hours to test how long they could remember this connection. It turns out that cockroaches can remember this connection for several days after training at night. Training at night, the effect is good; In the morning training, cockroaches can't form new memories at all.
Page said that it was really surprising that the defects caused in the morning were so obvious. Then why don't cockroaches want to learn at this time >>
Why is the pest cockroach called Xiao Qiang?
Xiao Qiang is named after Stephen Chow's films:
In Tong Pak Hu Dian Qiu Xiang, Tang Bohu, played by Stephen Chow, pretended to be a poor man who sold himself to bury his father in order to get into Washington, but he met an opponent who sold himself to bury his family, and even his dog who followed him for many years died on the spot. So Zhou had a brainwave and called the cockroach that was accidentally trampled to death around him "Xiao Qiang", crying for it as a pet that had been kept for many years.
The name comes from the fact that most children in Hong Kong are called Xiao Qiang. To show Stephen Chow's love for trampled cockroaches. Hence the name "Xiao Qiang".
In Weeds, Zhou's character is an innocent prisoner. He killed his good friend, but this one is not a man, but a cockroach. Stephen Chow called it "Xiao Qiang", probably because cockroaches are very tenacious, so it got its name.
Why do cockroaches appear at home?
You can put some mothballs in it. Cockroaches like warm, humid and dark environments, so they usually appear in tropical or other warm areas. Only a few species have become human pests. Cockroaches destroy more substances than they need to eat and secrete an unpleasant liquid. Cockroaches eat both plant and animal substances, including human food, paper, clothes and books to dead insects, especially bedbugs. Cockroaches can be controlled with pesticides.
According to the cockroach killing principle and administration mode, cockroach killing drugs are divided into the following categories:
(1) Contact killing, that is, spraying drugs or fumigating with smoke to make drugs reach the surface of cockroaches-killing cockroaches by contacting drugs with cockroaches. The main products of contact killing are:
(1) pyrethroid spray, the representative products are radar, mirex and so on. These products first entered the market and have been widely used or abused for more than 20 years. Cockroaches have a strong resistance to it, but it is basically ineffective against Blattella germanica (a small cockroach);
② Insecticidal powder, 0.09% synergistic bendazole, 5% malathion, 1% propoxur powder, etc.
(3) Cockroach-killing smoke, which is generated by physical methods, is used as a carrier to transport drugs to all corners to achieve the purpose of killing cockroaches, such as cockroach smoke bombs.
(2) Poisoning, that is, cockroach killing drugs are matched with bait, attractant, preservative, etc. According to a certain proportion, it is made into poisonous bait that cockroaches like to eat to kill cockroaches. The main products that cause death by feeding poison are:
(1) cockroach killing particles, cockroach killing drugs and poison bait are mixed, granulated and dried, which are mainly used for ground release in cockroach environment;
② There are two kinds of gel bait and wet paste bait: syringe and patch. This product has good palatability to cockroaches, but it is easy to air dry. Representative products include Kang Ye gel bait for killing cockroaches.
(3) Biological cockroach killing adopts an environmentally friendly way that is harmless to human beings. The main varieties are:
① Killing cockroaches by using different characteristics that different organisms (species) can't adapt to, leading to cannibalism and hunger strike death of cockroaches. China's "Lang Ping 1" is the only product of this kind;
(2) Use cockroach virus to make cockroach plague and kill cockroaches. Poisonous Island in China is the only product of this kind.
The above are typical and practical varieties of cockroach medicine, and a few varieties are omitted because of the limitation of effect or use occasion.
Although the following does not belong to the category of cockroach medicine, its function is similar to that of cockroach medicine, and it is also briefly explained.
① Cockroach trap: lure cockroaches into a set trap and then kill them, such as Uncle Cao's cockroach jar and cockroach house.
(2) Ultrasonic cockroach killing has gradually faded out of the market because of its poor effect and low ultrasonic radiation dose during use. ...
Are cockroaches pests or beneficial insects?
Pests, of course, but cockroaches eat them. Cockroaches contain a lot of protein, but they are dirty. He is contagious.
Are cockroaches beneficial or harmful?
Pests, of course, but cockroaches eat them. Cockroaches contain a lot of protein, but they are dirty. He is contagious.
What pests are cockroaches, what are their living habits, and how to kill cockroaches at home.
Its life habit is to like dark and humid places, and most of them only appear at night. First of all, we should keep the environmental sanitation at home. If you find cockroaches, don't rush to kill them. Take the pesticide first, then scald it with boiling water.