Once there was a biologist based on the ecological habits of cockroaches made a conclusion: if one day there is a global nuclear war on the earth, all the creatures in the affected area, including human beings and even fish, etc., will disappear, and only the cockroaches will continue to live their lives! This is because normally the human body can tolerate a radiation level of 5rems, and once the total radiation level exceeds 800rems, then death is certain. The German cockroach can tolerate 9,000-105,000rems, and the American cockroach reaches 967,500rems! So even if there is a nuclear explosion cockroaches can survive. The U.S. government now spends $1.5 billion a year on cockroach eradication, about twice the budget spent on fighting AIDS.
Most of them look pretty much the same, but on closer inspection you can see the differences. Current taxonomists categorize cockroaches into about 6,000 species, about 50 of which are pests, such as the common Asian cockroach. In addition, American cockroach (American cockroach), German cockroach (German cockroach), brown cockroach and Australian cockroach are also widely distributed. There are about 200 species in China, and about 10 species of common indoor cockroaches, varying from place to place. The common ones are the German cockroach and the American cockroach.
The German cockroach, with a very small body, about 10-15mm long, and brownish-yellow adults, is a common dominant species in the northern region. In addition to its distribution in housing, it is a dominant species in restaurants, caterers, hospitals and on ships, trains and passenger planes.
The American cockroach, a larger cockroach with a body length of about 30-40mm and a reddish-brown adult, is the dominant species indoors in the southern region, while in other regions it is distributed in sewers, heating trenches, toilets, bathrooms, and dark and damp environments such as breweries and sauces factories.
The scientific name of cockroach is cockroach. It has chewing mouthparts that enable it to gnaw and eat. The cockroach's diet is very complex and can include everything from ordinary foodstuffs to shoe-shine brushes, wire gum, cardboard, soap, paint chips, dead leaves, textiles, leather, hair and more. Entomologists have found 12 species of cockroaches that can live for a week on glue, and the American cockroach can live for a month on water only, and still live for three weeks if there is no food or water. Cockroaches will engage in like-kind behavior when food is scarce or space is overcrowded.
Cockroaches are good crawlers, swimmers and flyers in times of crisis. The flat body of the cockroach makes it good at living in small crevices and can survive almost anywhere there is water and food. If conditions are bad, they will not die if they do not eat or drink for a longer period of time. Cockroaches such as the above characteristics, so that their numbers are increasing day by day, the distribution range is expanding, has jumped to become the number one household pests.
Cockroaches like darkness and are afraid of light, preferring to come out by day and occasionally visible during the day. Generally after dusk, they begin to climb out of the activities, foraging, and return to the nest in the early morning. Temperature at 24-32 ℃ is the most active, 4 ℃ when completely inactive. In the tropics, cockroaches can breed and be active in all seasons. In northern regions, in winter, there are heating equipment indoor, the temperature is suitable, cockroaches can be active and breeding as usual. Most cockroaches are oviparous, and their eggs are arranged in an orderly manner in the egg sheath, which can resist the influence of adverse environment and are not easy to be killed by chemicals, and the larvae can hatch out when the conditions are suitable.
Cockroaches have a strong ability to reproduce. Male and female cockroaches after mating, the female cockroach's tail end will grow a shape like a pod-shaped thing called egg sheath, eggs are laid in it. A female can produce less than 10, more than 90 egg sheaths; an egg sheath, less than 10, more than 50 small cockroaches can be hatched, which is related to the cockroach species. In the eastern United States, an average house species inhabits more than 1,000 cockroaches; and a pair of German cockroaches can only reproduce into 100,000 offspring a year! It takes about 15 days for the cockroach's eggs to hatch in the egg holder. The newly hatched cockroach is a cream-colored worm without wings. Like other species of insects, it must molt as it grows. After 3-4 molts, wing buds can be seen. The German cockroach requires 6-7 molts to reach sexual maturity as an adult, while the American cockroach requires 10-12 molts. The growth of cockroaches and the number of molts are closely related to climatic factors and the availability of food. Usually this process is completed within two months.
Spiders, scorpions, ants, parasitic flies, parasitic wasps, toads, lizards, birds, and rats are common natural enemies of cockroaches.
Cockroach species living in the wild, most of the rotting organic matter or dead leaves and other staple food; and inhabiting the house cockroaches, like starchy food, in their crawling through the food, often will carry pathogenic organisms left behind and spread disease. Cockroaches have a bad habit of eating, spitting and defecating, thus contaminating the food and spreading many diseases, such as dysentery, paracholera, hepatitis, tuberculosis, diphtheria, scarlet fever, ascariasis and so on. No matter what species of cockroaches, the pathogenic organisms spread by them include typhoid bacillus, dysentery bacillus, E. coli, tuberculosis bacillus, anthrax bacillus, mange bacillus, etc., and the eggs of striped bugs, roundworms, schistosomes, etc. Cockroaches also secrete and excrete food. Cockroaches also secrete and excrete foul-smelling substances that make people feel nauseous and even vomit when they smell them. The Thai government has announced that it will not allow the sale of a kind of "giant cockroach" originating from Madagascar as pets, and will ban ordinary individuals from owning them.
Cockroaches have long been favorite experiments for biologists because they are easy to keep and reproduce.
How to get rid of cockroaches?
1.Carefully check gutters, cracks in walls, floor partitions and windows to prevent cockroaches from entering.
2. Keep the room dry. Cockroaches live in humid environment, so you should pay attention not to have any water leakage, especially in the kitchen.
3, keep the room clean, in a clean, dry environment, cockroaches will feel unwelcome. After eating, you should close the food in time, clean up the garbage on the ground and in the garbage bag in time, and rinse the tableware with hot water first, unclean tableware will attract cockroaches' eyes. In addition, the stove and other places should be cleaned regularly.
4. Use insecticides to eliminate cockroaches when no one is in the house.
Pieces of herbal medicine
Most people hate cockroaches, and some people spend a lot of time and energy to get rid of them. Nevertheless, there is no sign of extinction of this big insect. They have been on the planet for millions of years, and they are active almost all over the world. Fossils show that cockroaches lived on Earth more than 300 million years ago.
Wild cockroaches are common in tropical countries. They use their flattened bodies to crawl into cracks and crevices, making it difficult to remove them from houses, and leaving their droppings everywhere.
There are 3,500 different species of cockroaches in the world. The markings on their bodies make it easy for them to blend in with their surroundings.
This is the nasty sight cockroaches create when they crawl into a house. They are there for warmth and to hunt for food scraps.
The cockroach's long tentacles are organs of touch. At night, cockroaches use it to scout and forage for food.
I. Morphology of cockroach
Cockroach belongs to the order of insects, cockroach, which has lived on the earth for 280 million to 320 million years, and is a fossilized animal. There are 3,500 known species of cockroaches (5,000 species have been reported), and there are two types of cockroaches: domestic and feral. Feral species account for the vast majority of cockroaches, mostly living in grass, dead leaves, debris or under tree bark, but also in the nests of ants, termites, wasps, etc., and are generally not closely related to human beings. Domestic species account for about 0.5% of this item, mainly belonging to the family of cockroach, cockroach, cockroach, cockroach and cockroach, there are 13 species known in our country, and the common cockroaches are German cockroach, American cockroach, Australian cockroach, black-breasted cockroach, brown cockroach and so on.
Cockroaches vary in body size (2-90mm) and color. The cockroach's body is flat with an oily sheen, and the dorsal plate of the abdomen has openings for secretion glands that secrete a foul-smelling liquid. The triangular head has two small single eyes and a pair of large compound eyes. The two upper jaws are fan-shaped, interlocking like scissors, with tuberculous nodes protruding between the teeth, resembling a vise when crushing hard objects. The mouthparts are of the primitive masticatory type, with a hard upper jaw, a five-segmented mandible, and a three-segmented lower lip. There are four tentacles and many short hairs around the mouth. The tentacles are its tools for collecting food, and the short hairs are organs of taste and smell, with sensory nerves on them for foraging for food or avoiding poisonous baits. Cockroaches can climb walls and have small claws on their legs that are specialized for climbing walls. The nerve endings on the joints of the legs are sensitive to sensation and are aware of slight vibrations. The tail whiskers at the end of the tail are complex vibration receptors that can sense the direction of external stimuli. The feet are well-developed and are suitable for sprinting, capable of running three miles per hour, as well as swimming. Cockroach tentacles of the sense of smell is very sensitive, able to identify their own kind according to the smell.
The reproduction and growth of cockroaches
The Ⅹ dorsal plate of the abdomen of both male and female insects is called the supra-anal plate, and a pair of multi-segmented caudal whiskers grows on both sides of its base. Abdominal plate VII in females and IX in males are called the hypogonial plate. In males, the lower genital plate has one pair of pinnae (abdominal spines) on both sides of the end, which is an important feature to distinguish the adult of both sexes.
Adults of both sexes are capable of mating about a week after they have fledged. The male can mate many times in his life, but the female only mates once or twice, and one mating can make it produce fertilized eggs for a lifetime. Female cockroaches are not fussy: According to a new analysis of cockroach sex, female cockroaches are less fussy about male cockroaches when their reproductive peak begins to decline. Female cockroaches thus become more attracted to male partners, and females maintain a lifelong willingness to mate with male cockroaches. Some cockroaches, which pair up three to five times in their lifetime, will remain fertile for 40 days before the next pairing if they mate only once.
Females lay their eggs in special gelatinous sacs that form egg sheaths (egg pods). The egg sheath is produced by the female's secretions and is smooth, hard, waterproof and protects the development of the embryo within it.
The unmated females can also produce egg sheaths, but generally cannot hatch out the wakame. Individual species, such as the American cockroach and the cane cockroach, have parthenogenesis, in which the female produces fertile eggs without mating.
The behavior of cockroaches in laying egg sheaths varies from species to species, and indoor cockroaches mainly have three ways: 1, 1-2 days after the female produces egg sheaths, she chooses a more hidden place, and bites the surface of the object to make a depression first, laying the egg sheaths therein, and then covers the egg sheaths with viscous saliva mixed with crushed wood shavings or pieces of paper and other crumbs. Sometimes the saliva is used to stick the egg sheaths directly to the roosting places, such as cabinets, wooden (paper) boxes and tables in the corners or piles of debris. These egg sheaths contain sufficient nutrients to meet the needs of embryonic development. American cockroach, black-breasted cockroach, etc. The way of laying and placing egg sheaths belongs to this type; 2. After the female produces egg sheaths, she keeps dragging them on the end of the abdomen and does not lay them, and she does not detach them from the mother's body until the adult cockroach will hatch out from the sheaths. The embryo in the egg is constantly getting the water and nutrients it needs from the mother during its development, plus the egg sheath is carried by the female and can be better protected. If the egg sheath is shed early, the eggs in it cannot hatch. The egg-laying method of the German cockroach belongs to this type; 3. The female first produces a thin-walled and soft egg sheath in which she lays her eggs. After egg laying is completed, the egg sheath shrinks into the "nursery" of the body and remains there until the cockroach hatches. This is a form of cockroach oviposition. The cockroach's egg-laying method belongs to this type.
Cockroaches are metamorphic insects whose entire life history consists of three periods: egg, worm or adult.
1. Egg stage
Eggs are narrow and elongated, milky-white, translucent, and arranged in two neat rows in the egg sheath. The embryo's head is directed toward the aperture slit. When hatching, the worm pushes upward, causing the closed slit of the egg sheath to split open and escape. The number of eggs contained in the egg sheath is as few as a few and as many as more than 50. Egg sheaths hatch at a temperature of 25 ℃, relative temperature of 60-80% conditions, the egg period of about 28-90 days.
2. Waking period
The waking insects just hatched from the egg sheaths are gathered around the egg sheaths, which are white, and later the color becomes darker and spreads out, and the shape of the waking insects is similar to that of the adult insects, except that the body of the insects is small, wingless, and the sex organs are immature. The development of the worm is slow. It must go through several molts and grow up gradually, and the number of antennae and tail whisker segments also grows with age. After the last molt, the worm grows wings and feathers into an adult. The freshly molted worms and the newly fledged adults are also white, and the color gradually becomes darker later on. Worm stage is long, usually lasts about 30-450 days. After losing their appendages or damaging their antennae, the worms can molt and regenerate again in the next instar.
3. Adult stage
The six common species of cockroach adults all have developed or undeveloped wings, which can be distinguished from waking insects.
Adults of both sexes can be easily distinguished by their external morphology: male cockroaches have two pairs of appendages at the caudal end, one pair of segmented caudal whiskers, and one pair of tiny pinnae (ventral spines); female cockroaches have only one pair of appendages at the caudal end, i.e., caudal whiskers, and no pinnae; male cockroaches are generally thin and elongate, whereas female cockroaches are plump and broad; among a few species, male cockroaches have well-developed wings which reach to the caudal end, but female cockroaches have well-developed wings, and female cockroaches are not as well developed as the caudal end, but female cockroaches are more mature. end of the tail, but the wings of female cockroaches cover only the first half of the abdomen, or are wingless.
One of the characteristics of cockroach life history is long cycle. The shortest cycle of the German cockroach, for example, generally takes more than two months to complete a generation, and the longest American cockroach, such as the cockroach, lasts more than a year.
The adult cockroach also has a long lifespan, with the German cockroach taking the shortest time of about 100 days, and the American cockroach taking the longest time to survive for up to a year.
From the hatching of the cockroach to the adult life end count, cockroach life is very long, generally about 2 years, the longest can be up to three years, the shortest is about 200 days.
A fertilized female cockroach produces a large number of egg sheaths in her lifetime, and the American cockroach can produce more than 50, so the cockroach's fertility is very strong. A mature female cockroach can produce an egg sheath containing 14-40 eggs every 7-10 days, which is gelatinous and incubates between 20℃-37℃. The higher the temperature, the shorter the incubation time, at a constant temperature of 30 ℃, only 20-30 days, while the longest can be more than three months. A female cockroach can reproduce nearly ten thousand offspring a year, up to one hundred thousand.
Three, cockroach habitat and activities, diffusion, diurnal and nocturnal laws
Cockroaches like warmth, moisture, food and more crevices of the place of residence, which is their breeding needs of the four basic conditions. These conditions are generally found in buildings where people live and reside.
Cockroaches love warmth and moisture. In restaurants, homes, trains and ships, the kitchen is always the most serious place of infestation. In kitchens, they like to inhabit places near stoves and sinks.
Cockroaches like darkness and fear of light, day and night. During the day, they hide in dark and light-avoiding places, such as furniture, crevices in walls, caves and corners, and in piles of debris. At night, especially after the lights are closed and people are sleeping, they come out, forage for food and seek mates. In a 24-hour day, about 75 percent of the time in a state of rest.
Cockroaches are flat, suitable for drilling and hiding holes, and can hide in very narrow slits and holes. For example, the adult and adult cockroach of the German cockroach can hide in a gap of 1.6 millimeters, and the female carrying eggs can also inhabit a gap 4.5 millimeters wide. When inhabiting the crevice, the feet are close to the body, the tail whiskers are flat or in contact with the supporting surface, and the antennae are often extended outward and waved from time to time to keep alert.
The habitat of different species varies. The German cockroach is found in all kinds of crevices, such as around pipes, wall seams, cracks in siding and cracks between floors. The American cockroach likes to inhabit large holes and prefers hot and humid environments, such as fermentation workshops in breweries and soybean processing plants, and often lives in groups in shady wells, sewers and basements. The black-breasted cockroach is mostly found in the corners of cupboards, tables and under sinks.
In winter, the cockroach lives in kitchens, near heat sources such as stoves and radiators. In the summer, when the temperature in the kitchen is too high, they disperse and migrate to other places.
Cockroaches like to live in groups. In a habitat, as few as a few, as many as dozens or hundreds gathered together, due to the pheromone trapping effect. Cockroach adults and waking insects can secrete a kind of "gathering pheromone", which is secreted by the rectal cushion and excreted with the feces. In the place where cockroaches live, it is common to see brown fecal stains, and the more fecal stains there are, the more cockroaches gather. The more fecal matter there is, the more cockroaches will gather. Improving hygiene and removing cockroach stains is an important measure in the control of cockroaches.
The cockroach spreads in two ways:
Active diffusion: it spreads to different places by crawling or gliding. In order to find a suitable habitat and necessary living conditions, including temperature, humidity, food and hiding places. In the case of low room temperature, cockroaches tend to move to the crevices near around the stoves, or gather in warm environments such as heating ditches. During the hot summer season, they may glide over long distances and hide in cooler places to roost in order to avoid excessive temperatures. Have hygrophilic activity in order to obtain water and suitable humidity: at night, climb into sinks, swarm around buckets, or rest on water pipes. Indoor cockroaches can spread to surrounding neighborhoods through holes in walls and cracks in doors and windows.
Passive diffusion: In today's era of increasingly developed and frequent transportation, this mode of diffusion is especially prominent. Trains are seriously infested by cockroaches. The infestation rate can be as high as 40% in sleeping compartments and even higher in dining cars. Packages, luggage and other objects carried by travelers, as well as consignments, can carry cockroaches on trains. Cockroaches on trains can be carried everywhere by passengers and cargo. With all kinds of transportation, cockroaches have a global footprint.
Cockroaches are diurnal, hiding during the day and active at night:
It has been observed that the German cockroach is active from 19:00, with a peak at 21-22:00, a small peak at 2:00 in the next morning, and disappears at 5:00 am. The black-breasted cockroach starts its activity from 19:00, peaks at 20:00, and then two small peaks at 23:00 and 2:00 the next morning, and the activity ends at 4:00 in the morning.
It is also observed that the activities of the American cockroach in a 12-hour diurnal environment can be divided into 6 periods: 1: before the beginning of darkness, the level of activity begins to rise; 2: after the beginning of darkness, the activity increases significantly; 3: the peak of activity, which lasts for 2-3 hours; 4: a sudden drop in the level of activity; 5: in the latter part of darkness, the activity stays low; 6: in the latter half of darkness, the activity remains low. activity remains low; Phase 6: 5 hours after dawn, either still with low levels of activity or at complete rest.
Four, cockroach food
Cockroaches are omnivorous insects, taking a wide range of food. Various kinds of food, including bread, rice, pastries, meat and vegetarian cooked food, fruits and drinks, etc., especially like to eat fragrant, sweet, oily noodle food. Cockroaches are addicted to oil, in a variety of vegetable oil, sesame oil is the most seductive, some places call cockroaches as "steal oil woman". In sugar, brown sugar and caramel have the strongest luring power. Cockroaches also often bite other items, can nibble cotton products, leather products, paper, books, soap, wires and so on. In places such as outdoor garbage piles, gutters and toilets, they feed on decaying organic matter and even gnaw on dead animals.
The feeding habits of different species of cockroaches vary. The German cockroach loves fermented food and drinks, and beer; the American cockroach prefers rotting organic matter; and the Australian cockroach is mainly plant-based.
Water is more important to cockroach survival than food. Cockroaches can tolerate thirst and hunger, can not drink water for a month, and can not eat for three months (under the condition of water). In the case of the American cockroach, the female can survive for 40 days and the male for 27 days if only dry food and no water are given to the cockroach. Conversely, if water is available without food, females can survive for 90 days and males for 43 days. Cockroaches can still survive for a week without a head. Headless cockroaches simply die of thirst because they have no mouth to drink from.
When in poor environmental conditions, no food and no water, cockroaches will occur between the phenomenon of mutual cannibalism, big eat small, strong eat weak, especially just molted insects, can not move, the skin and tender, it became a race to compete for prey to ingest water in the body to maintain survival.
Fifth, on the cockroach increasingly prosperous note
Because of the development of urbanization, crowded, abundant food, the increasing number of buildings, the convenience of transportation and the rapid increase in logistics, to the cockroach provides a very ideal environment. At the same time, the indoor environment is also improving, the widespread use of air conditioners, home renovation, the increased use of heaters, all to the indoor cockroaches provide a good overwintering environment, so the indoor cockroaches are more and more. 25 ℃ is the cockroach's best activity period. The more modern the city, the easier it is for cockroaches to breed. For example, the German cockroach is most active when the room temperature is from 24℃ to 32℃. Computers, fax machines, distribution boxes, DVD players, communication equipment, refrigeration equipment, meters and other places have become the best place for cockroaches to settle down (known as "home appliance pests"). Its small size, adult insects only about 1.2 cm long, can crawl into the machine activities, reproduction, its feces, shells will seriously pollute the machine, and even cause the line short-circuit. According to the analysis, the important reason for the proliferation of German cockroach in office buildings is that employees eat in the office, plus many people like to eat snacks in the office, cookie crumbs, potato chip crumbs are very difficult to clean up. In addition, there is a lot of paperwork in the office, which is usually not allowed to be organized by the cleaners. The accumulation of clutter creates a breeding ground for cockroaches. The German cockroach reproduces quickly, taking only 60 days to reproduce one generation. After repeated spraying, the remaining cockroaches will easily develop drug resistance. Ordinary cockroach killing agents have limited power against them, and liquid cockroach killing agents cannot be sprayed inside sophisticated machines such as computers and fax machines. These cockroaches have become one of the three most drug-resistant pests in the world.
The focus of cockroach prevention should be on the catering industry, hotels and the food processing industry, where people come and go, where the temperature is favorable all year round, and where there is a lot of food, which provides very good conditions for cockroaches to survive and reproduce, followed by hospitals, homes, office buildings and large-scale computer rooms, where cockroach densities are the highest. Kitchens, food cabinets, feed stores, bathroom crevices and other dark corners where people can't easily notice have become hiding places for cockroaches.
The German cockroach is becoming a dominant species, the German cockroach is mainly yellow and reddish-red, and is much smaller than the American cockroach, the smallest of which is the size of a green bean. It prefers warmth, is widely distributed, reproduces quickly, and its activities are highly dependent on temperature. The cockroach is most active at 24℃ to 32℃, and spends 3 to 12 weeks in the waking stage, and survives from 20℃ to 29℃ for four to nine months, and 30℃ for two and a half months. In addition to the usual places where cockroaches stay, it likes to be active in the office computers, photocopiers, electrical sockets, etc., in the family's bed, the ceiling tops, and even window sills, packages door of some small crevices to gather thousands of. It can not eat for a month and usually hides in some places with small crevices into the home, such as packing cartons. The German cockroach loves to drink beer.
Six, cockroaches and the spread of disease
Cockroaches eat almost everything, but also can bite the baby's skin and fingers, but also drilled into the human ear to cause ear infections; but also to eat feces, sputum, and small animal carcasses. Eat while defecating, sticky with germs, contaminated food, spreading a variety of diseases. It has been proved that cockroaches can carry about 40 kinds of pathogenic bacteria to vertebrates, such as leprosy branching bacillus leprosy that spreads leprosy, bacillus bacillus bacillus that spreads adenomatous plague, Shigella dysentery bacillus that spreads dysentery and Shigella dysentery bacillus of diarrhea, Staphylococcus aureus that causes sores, Pseudomonas aeruginosa that causes urinary tract infections, Escherichia coli that causes infections of genitourinary tract and intestinal tracts, and Salmonella that spreads intestinal diseases and gastritis. A wide variety of salmonella such as Salmonella Typhi B, Salmonella Typhi, etc. Cockroaches can carry a variety of pathogenic bacteria that cause food poisoning, including Pseudomonas aeruginosa and Escherichia coli, as well as Clostridium perfringens and Streptococcus faecalis, etc. In addition, cockroaches can be artificially infected with pathogenic bacteria that cause food poisoning. In addition, cockroaches can be artificially infected with bacteria that cause Asian cholera, pneumonia, diphtheria, anthrax, anthrax, and combined diseases. Cockroaches can carry helminth eggs of roundworms, duodenal hookworms, tapeworms, roundworms, whipworms, and many others. They can also serve as intermediate hosts for a wide range of nematodes such as Candida, Cestodes, and Nematodes. Cockroaches can also carry a variety of protozoa, four of which are pathogenic to humans or animals, such as Amoeba dysenteriae and Giardia intestinalis. Cockroaches can carry, retain, and excrete viruses, including coxsackievirus and poliovirus. Cockroach secretions and feces also contain a variety of carcinogens. Cockroaches can also carry fungi, and a variety of fungi have been isolated from cockroaches captured indoors, including a large number of Aspergillus flavus. Although cockroaches carry a variety of pathogens, it is generally believed that pathogens cannot reproduce in their bodies and are mechanical vectors. However, due to their wide range of infestation and mixed diet, they can be active in places such as garbage, toilets and lavatories, and can also feed on food, so the spread of intestinal diseases and parasite eggs caused by them should not be ignored. Cockroaches produce foul-smelling secretions that destroy the flavor of food, and sensitive people who come into contact with food or dust that has been contaminated by cockroaches will have an allergic reaction.
The harm of cockroaches has been no less than that of mosquitoes, flies and rats, and is one of the most difficult pests to control. As people's living conditions have been improving in recent years, the sealing of housing, sanitary conditions have been greatly improved, flies and rats, which used to be regarded as the top of the pest biological species are also decreasing year by year. Because of this, the cockroach's living conditions are getting better and better, and as long as there is a gap of 1.6 millimeters, it can travel freely, and its body and secretions and feces carry a large number of disease-causing bacteria, coupled with the difficulty of prevention and control, and chemical cockroach control drugs are indirectly hazardous to human health, so cockroaches have become the primary pests threatening the health of human beings.
Seven, the limitations of chemical cockroach extermination
Scientific prevention of cockroaches, in addition to preventing cockroach invasion through environmental improvement, as well as improving indoor and outdoor hygiene, cleaning up clutter, removing garbage, blocking holes and plugging seams, and managing food and water to intervene in the conditions in which cockroaches rely on for their survival (food, water, and hiding places), can also be taken to eliminate cockroaches by chemical agents (insecticides), biological cockroaches, and physical methods of eliminating cockroaches. The company's website is a good place to find out more about the company's activities.
Most of the insecticides available on the market are chemical pesticides, including those formulated by professional pest control companies, such as sprays, baits, fumigants, poison tablets and cockroach chalks.
The massive use of chemicals, while killing cockroaches, has also caused such problems as environmental pollution, chemical residues, accumulation of chemicals, and the threat to the environment that is not easily degraded; the repeated use of pyrethroid chemicals over the years has made cockroaches highly resistant to drugs. Cockroaches are often active in places where human beings live, live and store food, and the use of chemical drugs to exterminate cockroaches may directly threaten the health of human beings themselves.
The chemical drugs themselves have the defect of treating the symptoms but not the root cause of the problem. In addition to the resistance of the cockroaches, the cockroaches and their egg sheaths hidden in the caves and crevices can not be exterminated, resulting in the omission of the killing, coupled with the insect's resistance to the chemical drugs, it is impossible to eradicate the cockroaches, and can only be used in a period of time to reduce the cockroach's density, but it will soon be rebound again.
Cockroach resistance has increased dozens of times or even more, according to experiments, with commercially available spray killing agent spraying cockroaches, in just 4-6 hours after the cockroaches will be revived, and at that time to see is only a pseudo-death phenomenon. For this reason, can only further increase the concentration of drugs or increase the dosage, which in turn accelerates the cause of environmental pollution and endanger human health.
Life often use chemical pesticides are mostly spray-type, the harm is very great:
Spray-type drugs are mostly able to stay, toxic substances first floating in the air and then fall to all corners of the room, including food, when people enter the room, these toxic substances also violated human health; chemical pesticide spices contain toxic substances, prolonged inhalation will be Paralyze the central nervous system of the brain and cause diseases of the oral mucosa, due to the low resistance of the elderly and children lead to high morbidity, especially for asthmatic patients have a greater impact; chemical pesticides of toxic substances on the human sperm damage, affecting the health of the next generation; chemical pesticides of the toxic ingredients are not easy to degradation, the impact on the environment for the survival of mankind is very large.
Imagine that the cockroach's resistance to drugs will increase by tens of times or even hundreds of times, and that the cockroach has the habit of eating and spitting, so even if the cockroach uses non-spraying cockroach pesticides, when the cockroach eats it into its mouth, it may also be able to run to the top of the food and "show" the vice of "eating and spitting", and then put the cockroach into the mouth. "The cockroaches are also known for their ability to run three miles an hour!