Blattella germanica is a kind of cockroach, which is difficult to kill even if it is soaked in liquid medicine. What's even more incredible is that German cockroaches are everywhere except China.
As for why it is called German cockroach, it may be that this cockroach was first discovered in Germany. According to experts, Xiao Qiang is a veritable "strong man":
It can survive in vacuum for at least 10 minutes.
It can swim in the water for 5 minutes without breathing.
Its crawling speed is definitely not slower than that of human walking.
When you trample it into pieces, it can still stretch its legs and struggle 10 minutes.
A millimeter or even a half millimeter gap, it is effortless to go in.
Nymphs (small cockroaches) under the age of three generally do not leave the cave. When there is no food, they will eat the feces of big cockroaches.
If it's a local cockroach, just scrape the floor with a ten-cent magic medicine pen and you can sweep the floor the next day; However, Blattella germanica, an "exotic", is immortal. If you don't take cockroach medicine, you won't die even if you take it. The strongest spray can't kill it, and it will make it more resistant to drugs.
From the fossil specimens, Blattella germanica can be traced back to 500 million years ago and is considered as the oldest insect on the earth. German Xiao Qiang eats everything, paper, rubbish and paste. As long as you can imagine almost all organic matter, statistics show that it may eat more than 3700 kinds of sundries.
The body length of Blattella germanica ranges from 1.2 cm to 1.4 cm. Its obvious feature is that there are two black longitudinal stripes on the chest plate, and the number of cockroaches can reach 35,000 per year. Blattella germanica can spread more than 40 kinds of bacteria, such as parasite eggs, hepatitis B virus, polio and aflatoxin related to liver cancer. The reason why reproduction is so rapid is a bit unbelievable: the popularity of air conditioning. It is found that Xiao Qiang likes to be warm in winter and cool in summer, and it is most active at room temperature of 24-32 degrees Celsius.
Blattella germanica goes out for food at night, but hides in cracks in various places during the day: because of its flat body, it can pass through the cracks of 1.6 mm and spread through the cracks of walls and doors and windows; German Xiao Qiang likes to work in office computers, photocopiers, power outlets and other places.
Kill german cockroaches by indigenous methods;
Cockroaches in Germany are small, reproduce quickly and are difficult to kill. They are one of the three major drug-resistant pests in the world at present, and their drug resistance is very strong. Therefore, it is almost impossible to poison it with drugs, but the indigenous method of "please go to the urn" has a very good effect, which does not cost money or pollute the environment. The solution is actually very simple, that is, a bottle with a height of 10 cm. This bottle is very important, which directly determines the success or failure of cockroach killing. Whether this bottle can be used together needs to be tested. First, catch two strong cockroaches and see if they can climb up. What can't climb up is the right bottle. Don't kill Xiao Qiang in the bottle, but also put some broken cakes in it to feed him. This cockroach doesn't sound the alarm like a mouse, so its kind won't be fooled. When other cockroaches see their companions chewing food happily, they will climb into the bottle one after another. It is not a problem to put dozens of cockroaches in a bottle one night. We'd better pave the way for Xiao Qiang to get into the urn smoothly.
What should these "prisoners of war" do? If you can't spray the medicine into the bottle, the medicine can't be used after it smells; Second, you can't use boiling water, and it won't come if it's tasteless. It is best to feed fish and birds to make full use of it. Besides, it's best not to forget to leave two big ones as bait.
Hope to adopt, thank you!
How to kill German cockroaches?
Blattella germanica is an urban pest with strong adaptability, rapid reproduction and easy to produce drug resistance.
Blattella germanica is a very important urban pest, which not only steals food, pollutes food, damages clothes, books, computers and other sophisticated instruments and causes economic losses, but also spreads a large number of diseases (called parasitic diseases, hepatitis B and polio). Studies have shown that Blattella germanica is also the main inducing factor of human asthma and allergy.
Because Blattella germanica has strong adaptability and fast reproduction (only 60 days for the first generation), it is easy to develop resistance to chemical pesticides, so it is very difficult to control it. It is reported that the most important and difficult task of pest control in American catering industry is to control Blattella germanica.
The damage of Blattella germanica is becoming more and more serious all over the country, so it is necessary to strengthen the research on its control. 1. Biology and habits of Blattella germanica. Blattella germanica is oval and flat, with six spiny feet and a pair of filiform antennae.
The adult is about 10- 14 mm long, light brown, and has two black longitudinal stripes on its back. Female worms can produce 4-8 egg pods in their lifetime, and each egg pod contains 30-48 eggs.
It takes about 2-5 months for Blattella germanica to develop from egg to adult, which is related to environmental humidity and temperature. Blattella germanica has a strong reproductive ability. Only when the killing rate is above 98% can the cockroach killing results be consolidated, otherwise the density of Blattella germanica will increase rapidly.
During the day, Blattella germanica hides in various crevices in the dark and humid parts of the room, such as the wall joints of hotel operation rooms and storage rooms, and the wooden joints of wooden tables and cabinets. If Blattella germanica can be seen during the day, it means that the population density of Blattella germanica in the environment is already high.
Blattella germanica requires high humidity, and its nest is generally less than four meters away from water and food. Without water and food, Blattella germanica can only survive for 2 weeks; However, if drinking water is provided, Blattella germanica can survive for more than 1 month.
Blattella germanica will use the memory of the environment when foraging. This habit of Blattella germanica suggests that poisonous bait should be placed in the food and habitat of Blattella germanica in control work.
2. Integrated control of Blattella germanica Integrated control of Blattella germanica also takes pests and their breeding environment as a whole, and integrates environmental, physical, chemical and biological methods to control Blattella germanica to minimize the damage to people and the environment. In the past, the control of Blattella germanica emphasized the use of new drugs and good drugs to shorten the frequency of drug use.
Results Blattella germanica caused serious pollution to the environment and was difficult to eradicate. It is half the battle to control pests by carefully investigating the breeding environment of pests and finding out the reasons for the breeding of pests and their nests.
In catering services, food processing plants, families and other places, Blattella germanica is generally hidden in the gaps, pipe holes, switch boxes and ceilings of food processing and storage parts. Don't leave out some mechanical equipment, they may hide many pests.
Most of the failures in Blattella germanica control are due to the failure to find all the hiding places of Blattella germanica in the environment and deal with them thoroughly, so that the new invasion of Blattella germanica cannot be extinct. Environmental improvement and physical control of food, water and nests are three basic conditions for Blattella germanica to survive.
Taking measures such as keeping indoor and outdoor clean, controlling food and water, and filling various gaps and holes in walls can significantly reduce the environmental carrying capacity of pests and make them difficult to reproduce. Blattella germanica usually comes indoors with food and furniture in summer. Therefore, we should carefully check the imported parcels and all kinds of sundries, and remove the garbage in time to avoid the invasion of Blattella germanica.
In the environmental investigation, the vacuum cleaner can be used to capture Blattella germanica gathered in the dark, which is beneficial to the next control work. Using sticky cockroach paper to monitor Blattella germanica in places where Blattella germanica is easy to move can not only catch residual pests, but also find problems in time.
Chemical control retention spray and poison bait are two basic methods for chemical control of Blattella germanica. Because the chemicals remaining on the indoor surface will remain for more than three months after spraying, it is difficult to remove them. Therefore, when controlling Blattella germanica, we should avoid spraying on the ground, walls and ceilings in a large area, and focus on the activities and habitats of Blattella germanica, especially near the gap between water and food.
Formulations suitable for retention spraying include microcapsule suspending agent, emulsifiable concentrate, emulsion in water, suspending agent and wettable powder. Wettable powder is suitable for treating rough and absorbent surfaces, while suspending agent is suitable for smooth and non-absorbent surfaces.
If there is a lot of oil on the surface to be treated, the use of emulsifiable concentrate will achieve better results. The Department of Tropical Diseases Control of the World Health Organization recommended 27 compounds for the control of Blattella germanica in 1997. At present, there are few kinds of insecticides used to kill cockroaches in China.
The gel bait for killing cockroaches is rapidly popularized because of its little environmental pollution, safe use and reliable effect. After cockroaches eat poisonous bait and return to their nests, other individuals in the population will have chain poisoning by touching them or eating their feces and corpses.
The dosage forms of cockroach killing bait are paste, gel bait, granular bait, bait box and so on. , suitable for schools, hospitals, offices and other places sensitive to pesticides. When using the cockroach-killing glue bait, it must be applied to the gaps or active parts where Blattella germanica gathers.
Smokers can be used to control Blattella germanica in cars, ships and basements. Smoke has strong permeability and can completely kill cockroaches, but its disadvantage is that the effect is not lasting, so it must be used in conjunction with other prevention and control measures.
Smokers are seriously polluted and are dangerous to people and animals, so attention should be paid to safety when using them. Biological control: the use of insect pathogens to control pests has the advantages of good safety and no pollution to the environment, and is especially suitable for controlling indoor and urban pests.
(omitted) 3. Resistance of Blattella germanica to chemical pesticides At present, only Blattella germanica has developed serious resistance, which makes it more difficult to control Blattella germanica. Studies have shown that it is easier for Blattella germanica to develop drug resistance by contacting with sprays that kill and control Blattella germanica, because the insect body surface can prevent the penetration of pesticides.
According to the investigation in Guangzhou, China, the average resistance coefficients of four wild strains from urban areas to cypermethrin, deltamethrin, permethrin and dichlorvos were 3.8 1, 2.30, 2.30, 2.94 and 3. 16 times that of sensitive strains, respectively. The resistance coefficient of cypermethrin and dichlorvos is higher (:3), which is consistent with the most widely used situation of these two drugs.
Wild Blattella germanica population collected in some areas of Guangdong Province.
How to completely eliminate German cockroaches?
1, washing powder is an efficient agent to trap and kill cockroaches, and its effect is even better than that of some chemical pesticides.
The way to do this is to scatter washing powder in places where cockroaches may haunt, and if you eat washing powder, you will die. 2. Take borax, flour, and a little sugar, mix them evenly, make them into balls the size of rice grains, and scatter them in the places where they haunt, and they will be poisoned if eaten.
This is a way to kill cockroaches with hot soapy water. Adding a bar of soap to 4 liters of hot water, dissolving it and spraying it directly on cockroaches can effectively kill cockroaches. 4. It's a way to kill cockroaches with soda. Mix sugar and baking soda in half and put it in the place where cockroaches haunt. After about 3- 14 days, cockroaches will disappear. It is said that this is also the most commonly used secret recipe for preventing cockroaches in the United States.
5. Boric acid mopping method to prevent cockroaches. After dissolving a proper amount of boric acid in hot water, wipe the floor with a mop or rag. After drying, white boric acid crystals will penetrate into cracks in the floor to prevent cockroaches and ants. 6. It is a cockroach prevention method for orange and lemon peel. After the peels of oranges and lemons are dried or baked, they are placed in various cabinets, which not only have the function of fragrance, but also have a certain effect of preventing cockroaches.
7, borax, flour, sesame sugar). Mix a little boron sand with flour and then drop a few drops of sesame oil.
Make a ball. Roll the paper into a tube, and then put the prepared pills into the paper tube.
8. Take 1-2 cans of sugar water bottles to catch cockroaches, put 3 spoonfuls of sugar water, add boiling water and half a bowl to make bait, and put the bottles in places where cockroaches are active. After smelling the sweetness, cockroaches will climb into the "trap" of cans. 9. Tung oil catches cockroaches. Buy100-150g tung oil, heat it and boil it into a sticky colloid, and apply it around a piece of wood or cardboard15cm square, with greasy and fragrant food as bait in the middle, and cover other foods to prevent it from being stolen.
When cockroaches feed, they can be stuck as long as they climb to the place with tung oil. Cockroaches' weakness: Cockroaches are omnivorous insects. They are hungry but not thirsty.
When killing cockroaches at home, citizens should block the water source, turn off the tap, dry the water, scratch with a pen or put poison bait around the pool, urinal and refrigerator base to make cockroaches contact with poisoning when taking water and feeding.
Why are German cockroaches in China? How did they come from?
Baike.baidu/view/1487, here is a very detailed introduction of Baidu Encyclopedia ~
Let me sum up: the common cockroaches south of the Yangtze River are flying American cockroaches. It's big.
The common cockroach north of the Yangtze River is Blattella germanica. Small brown one.
These two kinds are the most common in China. Ordinary northerners have never seen American cockroaches, that is, flying cockroaches. Most southerners have never seen Blattella germanica. (Blattella germanica can't fly, it's degraded ~)
As for how it was introduced into China, there are too many ways. Moreover, this kind of thing has existed in China for a long time. A long time ago, customs and epidemic prevention measures were not good. It is possible that they came with tourists, or that some of them crossed the ocean and came to China. Not only cockroaches, but also other species.