Fighting basement cockroaches - complete removal of insects

What black cockroaches look like, photo

Black cockroaches are distinguished by their characteristic coloring. At the same time, adult individuals have some differences in comparison with adults. A representative of the genus Blattidae is shown in the photo below.

Males and females exhibit sexual dimorphism. In this case, there are common signs in the description of adult individuals:

• Flat, uniform and oval body with a reddish-brown appearance;
• The location of numerous appendages at the end of the flattened abdomen;
• Isolation of yellow eyes on the movable head;
• The mouthparts are of the gnawing type with platbands lighter than other parts;
• Long, bristle-like antennae;
• Elongated paws with slightly flattened pads;
• Arrangement of small suckers between small claws;
• Long spines on the legs and thighs.

The size of black cockroaches is much larger compared to red parasites. Signs of the appearance of the female and male black cockroach are discussed in more detail in the table below.

If small cockroaches were found in the apartment, then these are nymphs (developing small individuals), which are smaller in size and lack sexual appendages. An insect goes through 6 main stages of development.

The presence of a black cockroach with yellow stripes in a living space indicates that the insect came from other latitudes along with transported items.

Where do black cockroaches come from?

Although cockroaches love to take up residence in various types of buildings, both new and old, many often begin their lives outdoors. When it gets too cold or too hot outside, they start looking for a new home. Instead of directly invading your apartment, they often end up in the drain first, which is usually warm and dark. Sewers provide the food and water insects need to survive and also provide protection from the elements.

Cockroaches are explorers and soon begin crawling up dry drainpipes, laying eggs along the way. As the larvae hatch, they continue to crawl up and out of drains, often ending up in dark closets, trash rooms, basements, etc.

Finding cockroaches in the basement or coming out of the sewer usually indicates:

• They found ways to invade the building from the outside.
• They are hungry and looking for food.
• If you see one cockroach, there are many others that will soon be crawling onto your territory.
• You should expect sewer odors to follow the arrival of cockroaches.

The presence of cockroaches in the sewer system would not be a problem if they remained in place. But they don't. Adult nymphs tend to migrate in search of food and new places where they can raise a new population. They can simply leave the sewer, pushing out ventilation dampers, and enter buildings.

Sewer roaches can also enter buildings when the main sewer line is backed up, dumping thousands of roaches. Heavy rains can push cockroaches out of combined sewers and into basements. Or the drain trap may dry out and the roaches may simply walk through the drain pipes, through the trap, and out of the floor drain.

When cockroaches occupy sewer systems and, more importantly, emerge from them, solving the problem is not as easy as you think. The older the sewer system, the more likely it will be infested with cockroaches and rats, and the more difficult the problem will be to solve.

Drain under the sink

Plum trees provide a good, cool, quiet place to breed, eat food, and hide for protection.

Prevent sewer roaches from getting into your kitchen and bathrooms by making sure sinks are used regularly.

The pipes below the drain have a U-shaped loop called a “trap.” If the bathroom is not used, all the water in the "trap" dries up and sewer roaches enter your home.

When drains are used regularly, water remains at the bottom of the U-shaped pipe, preventing the water from draining completely. This “trapped” water blocks sewer roaches from coming through the drain and into your home.

If you are not a professional plumber, you will have to study the design of your home sewer system from photos. This is essential if you have a problem with sewer invaders.

Harm to humans

As stated above, cockroaches transmit diseases because they carry pathogenic microorganisms in their bodies that can be transmitted to us, and cause diseases such as suffocation, tuberculosis, cholera, leprosy, dysentery, typhoid fever and more than 40 other pathogenic bacteria and viruses.

Insect development stages

A sexually mature female black cockroach can lay eggs for further reproduction. This process is carried out regularly (about 22 times) until the insect becomes an imago (about 7 months).

The female carries the capsules for 2 weeks, and then leaves it in a warm and protected place to reproduce on its own. It contains from 8 to 20 eggs. At the moment of opening, no more than 65% of the nymphs hatch, which quickly spread throughout the living space of the room.

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Given favorable conditions, cockroaches quickly go through their life cycle until the onset of the adult stage (about 7–12 months). If there is a sharp drop in temperature, then the larvae can wait in the wings for several years.

Structure of a black cockroach

Black cockroaches have a simple structure of the gnawing type mouthparts:

• The upper jaws have teeth that are used for digesting food;
• Taste buds are located in the appendages of the oral cavity;
• The inner side of the oral apparatus has an identical structure in comparison with other insects;
• The body cavity also has a similar structure in comparison with other arthropods. The peculiarity lies in the merging of the primary and secondary parts;
• Muscles are attached to the external skeleton.

The digestive system consists of the following parts:

• Oral cavity;
• Pharynx;
• Goiter;
• Masticatory stomach;
• Esophagus;
• Digestive secretion that promotes the digestion and absorption of food;
• Hindgut for removing excrement from the insect's body.

The danger of black cockroaches

The main harm that black cockroaches cause is that they enter living quarters from unsanitary places and successfully carry various infections and pathogens on their limbs:

• Helminthiasis;
• Typhoid fever;
• Dysentery;
• Diphtheria.

Insects can spoil household items and products, so when they appear, it is necessary to take appropriate measures to destroy them.

Ways to fight

When large cockroaches appear in an apartment, there is a risk of contracting dangerous diseases. Insects, crawling in trash cans and ventilation shafts, carry bacteria on their limbs. Once in a person's house, a cockroach can move around the dining table, toothbrushes, and dishes. To prevent the unpleasant consequences of cockroach raids, you should get rid of the pests once and for all.

Methods for controlling cockroaches

There are several ways to fight black cockroaches:

1. Chemical - the use of insecticides in the form of aerosols, gels, powders, traps, concentrated spray solutions, crayons, poisonous baits. Chemicals are affordable, quite effective, but harmful to human health or pets. Before treating the room, you should carefully read the instructions for use.
2. Mechanical - the use of glue, electric traps, homemade traps. This method is harmless to others, but it is advisable to use it only with a small number of pests.
3. Professional – call specialists from the pest control service. Professional employees use the most effective cockroach repellents, spraying them through fog generators. The result is noticeable immediately after treatment.
4. The folk method is to repel insects using plants (wormwood, geranium, bay leaf), household chemicals (vinegar and boric acid, borax, soda), essential oils (eucalyptus, mint, cloves).
5. Thermal – extermination of cockroaches by freezing. In winter, all windows and doors are opened indoors. In such extreme conditions, cockroaches die. The method is useless in apartments with central heating.

Each method is good for a specific case. Whether to poison pests yourself at home or pay for the expensive services of pest control workers - the choice remains with the apartment owner.

Ways of insects getting into living quarters

Black cockroaches can appear in an apartment even under perfectly clean conditions. For safe crawling of insects, a close proximity to the nest of parasites is sufficient.

Main routes of entry:

• The presence of cockroaches in neighbors, since this method is considered the most common. Parasites easily move into the apartment through existing cracks and holes;
• Sewer passages that are located around the entire perimeter of the apartment;
• Basements, ventilation shafts, and garbage collectors are considered the most favorable places for cockroaches to breed;
• Large black cockroaches most often appear in an apartment along with brought things (bag, suitcase, other items);
• When purchasing household appliances, furniture, or hand-me-downs, there is a risk of transferring parasites into your own home.

These insects like to hide in secluded places (cracks between furniture, sewer holes, baseboards, areas behind wallpaper, sofas, cabinets and other furniture).

How to get rid of black cockroaches in an apartment

It is useless to remove black cockroaches only in your apartment. Sometimes a couple of weeks are enough to rediscover traces of their presence. Insect baiting must be done throughout the entire multi-story building at the same time. This is the only way to clean your own premises for a long period. This process can be speeded up by following these rules:

• dispose of garbage at least once a day;
• carry out wet cleaning as often as possible;
• store food in containers with closed lids.

If the sanitary and epidemiological station ignores the treatment of basements, you should remind it of this. Please note that in private homes this service is paid.

Facilities

There are two types of insecticides. Pyrethroids containing permethrin, cypermetriom, cyhalothrin, and deltamethrin work best against cockroaches.

Organophosphorus with fenthion and chlorpyrifos is usually used as a preventive measure.

TOP 12 best remedies for cockroaches in the apartment

Effective gels

The gels “Dohlox” (45 rubles) and “Globol” (280 rubles) have proven themselves well in the fight against insects. They kill more than just the cockroaches that eat them. Mature individuals and nymphs that came into contact with them also die.

List of the best gels for cockroaches

Sprays and aerosols

The best insecticides in aerosol packaging are considered to be “Ray” (190 rubles) and “Clean House” (170 rubles). They are easy to use and relatively safe. One bottle is enough for 3–5 treatments.

Traps

It is impossible to completely remove black cockroaches using traps. They are intended for their smaller red-haired compatriots. Only young individuals can fall into traps, and large mature specimens will be completely safe.

10 Most Effective Cockroach Traps

What do these insects eat?

The peculiarity of the structure of the oral apparatus of black cockroaches allows them to be omnivores, so they can consume the following foods, plants and materials:

• Confectionery;
• Sugar, cereals;
• Fish, meat;
• Fruits vegetables;
• Indoor flowers;
• Leather Products;
• Paper, soap, glue, books.

At the same time, black cockroaches most like to feast on leftover food and prefer beer, as it is often used as bait. The process of food absorption occurs mainly at night, when the rhythm of life in the apartment subsides.

Body parts of a black cockroach

The body consists of a head, abdomen and chest. There are antennae on the head that extend while moving forward and act like antennas, subtly capturing all odors and the smallest vibrations in the air. The thoracic region is divided into segments: prothorax, metathorax and mesothorax.

The black cockroach has 3 pairs of legs. The foot has claws and a suction cup, which allows the cockroach to move across different surfaces.

Cockroaches have wings. The abdominal region consists of segments. The first seven sections are large, and the rest are reduced. On the last segment is the anus, where the sensitive processes, the cerci, are located.

The male has protrusions called styli on the ninth segment. They provide protection to the genitals. Cockroaches do not use their wings for their intended purpose. Females have no wings. The oral apparatus of the black cockroach is represented by powerful jaws. Throughout the intestines, food is digested with the help of enzymes. The chewing ventricle is an organ in which food is thoroughly crushed and processed by special bacteria. Such digestive organs allow the black cockroach to feed on solid food (cardboard, leather shoes). An insect can live without food from two weeks to six months

Reproduction of black cockroaches

The life cycle of cockroaches is divided into 3 main forms of development (egg, larva, adult). Summer time is considered a favorable period for the reproduction of insects. Females begin to lay eggs in a chitinous cocoon containing 16 embryos.

The female, who is preparing to increase her offspring, has a slightly enlarged belly, and for several days she leaves the eggs in a quiet and secluded place. The period of development and hatching of new individuals is 44 days. After this time, new individuals begin their life cycle of development, which can range from several months to 5 years.

Appearance of a black cockroach

The black cockroach looks, in principle, almost like a red cockroach, only black, but it also has its own remarkable features.

The main feature is its impressive size. The body length reaches 30-40 millimeters, but there are individuals up to 5 centimeters in length. The body of the cockroach has a black shiny chitinous shell. It is very hard, so it is difficult to crush it and when pressed, a characteristic crack is heard. The flat body of the cockroach allows it to quickly penetrate any narrow crevices. They love the dark, have good eyesight, and can detect smells.

It is noteworthy that the male and female black cockroach differ significantly from each other. The female's abdomen is much wider, while her wings, on the contrary, are much smaller. The male's antennae are shorter and the pronotum smaller than those of the female.

Body parts of a black cockroach

Lifestyle of a black cockroach

The black cockroach lives next to people, forming a small colony. They often settle in basements and garbage dumps. They choose the lower floors for housing; they can rarely be found in houses above the 5th floor. They give preference to warm and humid places, as they cannot go without water and food for a long time. They die at temperatures below 0 degrees.

The life cycle of black cockroaches includes three stages:

1. Egg.
2. Nymph.
3. Imago.

After the fertilization process, the female lays eggs in a special capsule (edema). It is located at the end of the abdomen and holds up to 16 eggs. The female bears the offspring for a short time, and then leaves them in hidden places. The incubation period usually lasts 44 days. After which white larvae are born. Over time they darken. As the nymph grows, it molts approximately 10 times. The period of transformation of a nymph into an adult cockroach lasts about 6 months to a year. The average lifespan of a black cockroach is 2-3 years. During this period, the female manages to produce 1-2 offspring.

Insects feed on what falls from the dining table onto the floor, for example, crumbs. A lot of their food is in the trash. If they cannot find anything edible, they begin to eat leather goods, paper, and plants.

Who is more dangerous, red or black cockroaches?

Residential premises can be infested with black or red cockroaches, but the two types of insects do not get along with each other, since they claim the same living conditions.

In such a fight, red cockroaches have an advantage, since they reproduce much faster in comparison with their black relatives.

The appearance of the black cockroach is alarming, since the body length is up to 5 cm with a corresponding color and sparkling tint, emanating an unpleasant odor.

If we talk about the danger of both species, then these insects can carry various infections and diseases on their limbs, which causes a potential risk for humans. Therefore, when they appear in an apartment, it is necessary to carry out appropriate disinfection measures.

Why are black cockroaches dangerous?

Black cockroaches are unable to bite through human skin, but they can damage the epidermis. There is no painful sensation, but pathogenic microorganisms, mainly bacteria and fungi, easily penetrate through microtraumatized tissues. Many of them provoke skin infection with further spread of the inflammatory process to neighboring areas of the body. In young children, such reactions occur much faster.

Black cockroaches are capable of carrying bacteria on their bodies that cause dangerous diseases. Their penetration into the gastrointestinal tract will lead to fever, digestive and peristalsis disorders, and headaches. Immediate use of antibacterial and antimicrobial agents and rehydration therapy are required.

Basic methods of controlling black cockroaches

Methods of combating black cockroaches involve the use of various techniques with certain effects that make it possible to completely exterminate these parasites.

Mechanical restoration

One of the main methods of controlling cockroaches is mechanical action using a fly swatter or an ordinary slipper. Moreover, this technique is effective for a single detection of the parasite.

If there is a whole colony of cockroaches in the apartment, then simple mechanical extermination will not give the desired result and other disinfection measures will be required.

Carrying out heat treatment

Heat treatment is based on freezing the places where parasites accumulate. If cockroaches are infested in an apartment building, then this method will not work, since you will have to completely turn off the central heating, which is quite problematic.

Using repellents

Repellents are certain substances that have a repellent effect on black cockroaches. Parasites react poorly to various odors (rye during flowering, bay leaves, elderflowers).

The use of the technique is safe for humans, since these products are of natural origin. At the same time, the parasites quickly get used to them and begin to reproduce safely.

Traps

Traps are used to eliminate black cockroaches when there are small concentrations of them. As bait they take foods that he likes to feast on. The devices must be placed in places that are clearly visible to insects.

Types of traps:

1. The necessary delicacy can be placed in a glass jar with sunflower oil, since if it gets in, the cockroaches will no longer be able to get out of it;
2. The desired effect is achieved by lubricating the cockroaches’ paths to the treat with an adhesive composition;
3. The design of modern traps is equipped in such a way that when cockroaches get into them, they die from exposure to electric current;
4. Carrying out disinfestation using an electric discharge.

Insecticides

Insecticides are aggressive chemicals that act on the cockroach’s body and contribute to its complete destruction. This technique is considered one of the more effective and is used by various disinfection services.

The relevant stores offer a wide range of such products. Effective insecticides in liquid consistency:

• Cucaracha has class 2 toxicity and is capable of destroying all existing parasites in one go;
• The substance helps to destroy cockroaches due to exposure to each other and damage to the intestines, which leads to their death;
• Delta Zone. A drug with intestinal and contact effects. The product is safe for people and pets;
• Ksylat 25. The substance has a high efficiency and degree of toxicity, therefore it is used only by professional disinfectors;
• Lambda Zone. The product does not have a negative effect on the human body, plants or pets. Does not cause addiction among parasites.

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Insecticides in the form of gels have a potent effect and are discussed in detail in the list below:

1. Trap Gel-paste Sturm . When using the product, all individuals gradually die over 2–3 days. The effect lasts about 2 months. Application is done pointwise.
2. Gel Globol . An effective remedy that has a fairly high cost. The drug is presented in the form of a convenient tube that easily penetrates hard-to-reach places. Kills up to 500 cockroaches with one treatment.
3. Gel Fas. The product has toxicity class 4 and can be used when processing any equipment, as it does not leave any traces behind.

The aerosol form of insecticides is often used by professionals. Common uses include the following:

• Raptor allows you to completely destroy crawling and flying insects;
• Combat has a pleasant lemon scent and helps kill cockroaches while simultaneously freshening the air in the living room.

Powders are popular among insecticides used because they are easy to use:

• Pyrethrum. The composition of the product is based on the content of plant components of natural origin (chamomile flowers), which effectively eliminate various types of insects;
• Borax. The powder is mixed in equal proportions with sugar or flour, and then the affected area is treated;
• Medilis Cyper. It has an effect on home and garden parasites, therefore it has a wide range of applications

Methods for exterminating pests

Over the years, people have come up with different ways to remove cockroaches. But not everyone knows how to get rid of black cockroaches in an apartment for a long time. There are a variety of methods to combat these arthropods. The most common types of pest control are presented below.

1. Freezing - in winter, the room is not heated for two to three days, thereby destroying all types of insects that lived in it. The method is very reliable and safe, but in an apartment building it is impossible to implement it due to the central heating system. It is also necessary to consider at what temperature cockroaches die.
2. Folk remedies. Repelling with strong odors (bay leaf, ammonia, elderflower, orange peels) is not the most effective way to get rid of huge cockroaches. After some time, they may get used to it and not react to a particular smell. Baits with boric acid are considered more effective.
3. Insecticidal preparations are chemical substances that poison all living organisms into which they enter. The most effective method of controlling cockroaches, but it is also the most dangerous for pets and humans. Insecticides are presented in the form of gels, creams, crayons, dusts, powders, and sprays. Such methods require increased caution during their application. Among the popular products are Global, Dohlox, Raptor, Combat, Get, Clean House, Fas, Raid.
4. Mechanical extermination and traps are effective if one or more insects accidentally entered the apartment and have not yet managed to acquire a colony.
5. Ultrasonic exposure is a method that temporarily paralyzes the nervous system of a cockroach. After using ultrasonic repellers, you need to quickly get rid of the affected insects before they come to their senses.

Is it possible to eliminate black cockroaches forever?

Complete destruction of black cockroaches is almost impossible if you treat the premises yourself. If the cleaning is carried out by the SES, then the extermination rates are much higher, but such treatment requires massive contamination of a residential apartment building.

The main factor in exterminating cockroaches is eliminating the main source of parasite reproduction. As a preventative measure, you can also use a combination of chemicals with proven folk remedies.

To obtain the required impact effect, it is best to treat all infected apartments on one day, since in this case the remaining individuals will have nowhere to hide.

Preventive measures

Prevention of the proliferation of black cockroaches in residential premises is based on following simple recommendations:

• Keeping your own home clean and carrying out regular cleaning;
• Carrying out wet cleaning at least 2 times a week;
• Keeping food in proper place;
• Sealing the ventilation window with a thin mesh to prevent parasites from entering the room through the ventilation;
• Closing sockets with special plugs;
• Eliminating the presence of water in the sink or on the floor;
• Prohibition of leaving unwashed dishes in the sink for a long time;
• Carrying out all necessary measures in consultation with neighbors if parasites have been identified.

How to get rid of sewer cockroaches?

Black cockroaches are not the best apartment neighbors, so the desire of any sane person is to get rid of unpleasant and dangerous insects as soon as possible. The fight against them should begin as early as possible, as soon as you manage to see at least one black insect or smell a specific smell.

Mechanical destruction

This method is not the most effective, but this does not mean at all that if you see an insect in the sink or on the wall, you should not destroy it using a slipper, brush or any other thing that comes to hand.

Of course, it is impossible to get rid of the entire colony of beetles this way, but at the initial stage of infection, exterminating at least one individual will not be superfluous.

Lures, traps

Various plastic devices are considered one of the effective options for killing cockroaches. They are affordable and effective means of combating parasites. The devices, depending on their design, have different operating principles:

1. Contains poisonous filling.
2. They are a labyrinth from which cockroaches cannot get out.
3. They exterminate insects by exposing them to electric current.

Repellents

A fairly popular way to drive away cockroaches is to scare them away with strong-smelling herbs. Such products usually turn out to be ineffective in terms of killing insects, but they repel them well.

If cockroaches have already settled in the apartment, no smells can make them leave. But the bouquets of herbs and spices placed everywhere cause inconvenience to the residents: not everyone likes it when the house smells strongly of bay leaves, elderflower, and pyrethrum.

Insecticides

The fastest and easiest way to get rid of sewer cockroaches is with insecticides. These are the names of chemicals produced in various forms:

• aerosols;
• powders;
• liquids;
• gels;
• pastas.

Aerosols

Important! Any type of insecticide contains toxic substances, so when working with them you must follow the instructions.

The purchased drug is applied to interior items, near the sink, sewer pipes, bathroom, creating a kind of barrier that prevents the spread of insects.

Traditional methods

In the fight against insects, almost all methods used by the people are useless and ineffective. Garlic, mustard, wormwood and other aromatic substances do not repel cockroaches at all. The only thing these insects do not like is compositions based on boric acid. Such products can be placed in places where pests appear and updated periodically.

There is only one folk remedy that is really effective. This is freezing. But it can only be used in the private sector: sensing the cold, cockroaches quickly retreat to a safe zone, that is, a neighboring apartment.

On a note! If the infestation is severe, it is best to seek professional help. It is advisable to do this with the whole house: if you treat one or several apartments, the sewer cockroaches will go to the neighbors for a while and will definitely return after a while.

Why do you dream about black cockroaches?

The appearance of a large black cockroach in a dream when studying many dream books indicates that a person may have various kinds of troubles, discord with loved ones, or a deterioration in business ties.

If a person killed a black cockroach in a dream, then this phenomenon is considered an omen of a favorable outcome in the planned matter. Seeing a parasite on the threshold of significant events (moving, marriage, birth of a child) is good news in these matters.

At the sight of a dead insect, a person’s plans may not come true. It is bad when in a dream a cockroach attacks a sleeping person or crawls on him, as this means the emergence of additional problems and misfortunes in a person’s life.

Character and lifestyle of the black cockroach

Black cockroaches are characterized by a nocturnal lifestyle. Insects leave their nests after midnight. They look for food that they can live without for more than two weeks. Their way of life is quite hidden from humans.

They inhabit the most secret places in human housing. These could be crevices, cracks, garbage boxes, bathrooms, pantries with food supplies. Black cockroaches are often found in ship cabins and warehouses.

These insects can also be found in natural conditions. Black cockroaches make their nests among rocks. It is not uncommon to encounter a black cockroach in an ordinary forest, especially where people have created unsanitary conditions.

Black cockroaches are characterized by constant movement during the active night period. Cockroaches can travel many kilometers in search of food. They are considered the most amazing insects due to their ability to move at a speed quite high for insects.

Looking into all corners of the room in search of food, constantly changing the direction of movement, insects move at a speed of 4-5 km per hour. Since black arthropod insects represent the synanthropic order, it is likely that black cockroaches will appear in the apartment .

The discovery of such a parasite, as a rule, does not cause joy among homeowners. People try to get rid of unpleasant neighborhoods. If the owner of the house comes across a large black cockroach , urgent measures must be taken.

These insects never exist alone indoors. Acute vision, a developed sense of smell, and body structure help them easily penetrate into a person’s home and occupy the most inaccessible corners of the room and crevices.

They can settle in household and sanitary equipment. Their presence can be detected in the most unexpected places, for example, in an outlet or washing machine. The introduction of large black insects into the house has a negative impact on the health of homeowners, especially their children. The secretions left by cockroaches cause the development of allergic diseases; in addition, the cockroach secretes infectious bacteria from the intestines.

Eggs of all kinds of parasites can be carried by cockroaches on their legs. The black cockroach turns out to be very dangerous for humans of this neighborhood, there are many options. The fastest and most effective method is to call the special services. This insect is difficult to confuse with other representatives of arthropods.

The black cockroach in the photo , as in life, looks disgusting. It is known for the fact that it and its relatives quickly develop immunity to insecticides that are used to kill them. It is pointless to re-use the product to combat them.

To avoid the hassle of killing insects in the form of black cockroaches, you should pay attention to what causes cockroaches to appear. The main reason is unsanitary conditions. Only cleanliness and proper plumbing guarantee that black cockroaches will not appear in the house.

Since black cockroaches have been known since ancient times, quite complete information has been collected about them. Based on it, many options have been developed for the destruction of arthropod pests. A frequently used effective remedy for black cockroaches is boric acid. This substance accumulates in the blood of the insect, leading to its paralysis and death.

However, only specialists can use this drug correctly. Otherwise, the expected effect will not be achieved; cockroaches will be able to develop resistance to the effects of the drug. It is necessary to remember where black cockroaches can appear in an apartment or house. Malfunction of the drainage system, water and secluded corners with free access to food.