Combating cockroaches is one of the most urgent tasks when these unwanted insects appear in your home. Cockroaches – the correct term for these pests – are considered hygiene pests that can transmit pathogens and reproduce rapidly in warm, humid environments. If you discover cockroaches in your kitchen, bathroom, or other living spaces, you must act quickly and consistently. In this comprehensive guide, you'll learn how to safely identify cockroaches, which control methods are truly effective, and how to prevent future infestations.
Identifying Cockroaches: What Types of Roaches Are There?
In Germany, three main cockroach species are found in buildings. The distinction is important because control strategies may differ depending on the species:
German Cockroach (Blattella germanica)
The German cockroach is the most common cockroach species in Central European households. It grows 12–15 mm long, is light brown in color, and has two dark longitudinal stripes on its pronotum. Although it has wings, it does not fly. The German cockroach prefers warm, humid environments and is primarily nocturnal. It reproduces extremely quickly: a single female can produce up to 300 offspring in her lifetime.
Oriental Cockroach (Blatta orientalis)
The Oriental cockroach, also called the kitchen cockroach or roach, is significantly larger than the German cockroach at 20–28 mm. It is dark brown to black in color and prefers cooler, humid areas such as basements, drain shafts, and boiler rooms. Males have shortened wings, while females have only wing stubs.
American Cockroach (Periplaneta americana)
The American cockroach is the largest of the three species at 28–44 mm. It is reddish-brown in color and can fly short distances. In Central Europe, it is mainly found in heated greenhouses, zoos, swimming pools, and occasionally in large kitchens.
In addition to these three main species, the forest cockroach (Ectobius sylvestris) occasionally enters apartments through open windows and doors. However, it is not a hygiene pest, does not reproduce in buildings, and will naturally find its way back outside. You can identify the forest cockroach by its smaller size (6–10 mm) and its light brown, translucent appearance.
Correct species identification is crucial for control: while the German cockroach lives almost exclusively in heated buildings where it reproduces rapidly, the Oriental cockroach can enter from sewage systems and basements. A pest control professional can definitively determine the species based on body structure, wing shape, and location.
Signs of a Cockroach Infestation
Since cockroaches are nocturnal, an infestation often goes unnoticed for a long time. Watch for these typical signs:
- Droppings: Cockroaches leave small, dark fecal pellets that look like ground pepper. These can be found along their pathways, in drawer corners, and behind appliances.
- Shed skins: Cockroaches molt multiple times during development. You'll find the translucent, empty husks in hiding places and near nests.
- Egg cases (oothecae): The brownish, bean-shaped egg capsules contain 15–40 eggs depending on the species and are laid in protected corners.
- Musty odor: With heavier infestations, cockroaches emit a characteristic, sweetish-musty smell caused by glandular secretions.
- Feeding damage: Gnawed paper, wallpaper, book spines, and food packaging indicate a roach infestation.
- Sighting of live insects: If you see cockroaches during the day, the infestation is already advanced. The nests are overcrowded, and the insects are forced to forage even in daylight.
Combating Cockroaches: Effective Methods
Controlling cockroaches requires a systematic approach. Single measures are rarely sufficient – combine multiple methods for maximum effectiveness.
Thorough Cleaning as the Foundation
Before using control products, you must eliminate the cockroaches' livelihood:
- Remove all food residues and store food in airtight containers
- Thoroughly clean grease deposits behind the stove and oven
- Dry sinks and wash basins before bedtime
- Eliminate water accumulation under flower pots and in saucers
- Remove old newspapers, cardboard, and other hiding places
Sticky Traps for Infestation Monitoring
Before beginning active control, sticky traps help assess the extent of the infestation and identify the main pathways of cockroaches. Place traps at strategic points: under the sink, behind the refrigerator, next to the stove, and in bathroom corners.
Insecticides for Cockroach Control
Professional insecticides are essential for effective cockroach control. Two proven products from the HexGuard range are particularly suitable:
Product Recommendation: Afanisep 25 WP – Broad-Spectrum Insecticide
The Afanisep 25 WP is a powerful insecticide in powder form that is mixed with water and sprayed on infested surfaces. The active ingredient forms a long-lasting protective film on treated surfaces that kills cockroaches on contact. Ideal for treating hiding spots, joints, cracks, and pathways. The long-term effect ensures that newly hatched cockroaches are also eliminated.
Product Recommendation: Alfasect Spray for Insects
The Alfasect Spray offers an immediately effective solution against cockroaches and other crawling insects. Spray it directly into cracks, behind cabinets, under sinks, and into other hiding spots. The combination of immediate action and residual effect makes it the ideal product for initial control of an acute infestation.
Cockroach Hiding Places: Where to Search
To combat cockroaches effectively, you must know their preferred hiding spots. Cockroaches hide during the day in narrow, dark, and warm crevices:
- Behind and under kitchen appliances (refrigerator, stove, dishwasher, microwave)
- Inside and behind kitchen cabinets, especially in corners and hinges
- Under sinks and wash basins, especially at pipe penetrations
- Behind baseboards and loose wallpaper
- In electrical appliances (coffee makers, toasters, outlets)
- In drains and traps
- In the area of heating pipes and hot water lines
- In cardboard boxes, newspaper stacks, and paper bags
Prevention: Keeping Cockroaches Away Long-Term
After successful control, consistent prevention is essential to prevent future infestations:
- Hygiene: Keep your kitchen and bathroom clean at all times. Remove food scraps, grease splatters, and crumbs immediately.
- Reduce humidity: Repair leaking faucets, ventilate regularly, and avoid water accumulation.
- Seal entry points: Close cracks and crevices at pipe penetrations, outlets, and baseboards with silicone.
- Secure food: Store all food in sealed containers. Remove pet food bowls after feeding.
- Dispose of garbage: Empty trash regularly and use only bins with lids.
- Inspect used furniture: Thoroughly check second-hand furniture, appliances, and boxes for cockroach infestation before bringing them into your home.
- Regular inspection: Check typical hiding places monthly – under sinks, behind refrigerators, and in cabinet corners – for droppings or shed skins.
- Check luggage: Cockroaches can be introduced through luggage, especially from southern countries. Unpack your suitcase in the bathroom after travel and inspect it thoroughly.
Consistent adherence to these measures is the best protection against future infestation. Cockroaches can return to buildings with gaps in hygiene – prevention is therefore an ongoing process, not a one-time event.
Also read our guide on Identifying Bed Bugs: Bites, Signs, and Control – another hygiene pest that uses similar hiding strategies.
When Should You Call a Pest Control Professional?
Professional help is absolutely recommended in the following situations:
- In a German cockroach infestation that doesn't improve despite your own measures
- In multi-unit buildings, as cockroaches migrate between apartments and coordinated control of all affected units is required
- In commercial kitchens, restaurants, and food businesses where legal hygiene regulations must be maintained
- In case of repeated infestation despite control measures
A professional pest control specialist uses gel baits that work in the nest and conducts follow-up inspections to ensure treatment success. In rental apartments, the landlord is usually responsible for the costs of professional pest control.
Cockroaches in Rental Apartments: Rights and Responsibilities
A cockroach infestation in a rental apartment is a significant defect, and the landlord is usually responsible for its elimination. Report the infestation immediately in writing and document it with photos. The landlord must then promptly hire a professional pest control service. The costs are generally borne by the landlord or property management – unless the infestation is demonstrably caused by the tenant's behavior.
In multi-unit buildings, coordinated control in all affected units is required, as cockroaches can migrate between apartments. Measures in only one apartment are usually not permanently successful, as the insects constantly reinvade from neighboring, untreated units.
Frequently Asked Questions (FAQ)
Can Cockroaches Transmit Diseases?
Yes, cockroaches are considered hygiene pests and can transmit numerous pathogens, including Salmonella, E. coli, hepatitis viruses, and various parasitic worms. Additionally, their shed skins and droppings can trigger allergies and asthma. An infestation should therefore be taken seriously and eliminated quickly. The World Health Organization (WHO) lists cockroaches as relevant disease vectors in urban environments.
Does a Single Cockroach Mean an Infestation?
A single cockroach may have been accidentally introduced, such as through shopping bags or luggage. However, there is a high likelihood that more insects are present, as cockroaches are social creatures. Set up sticky traps to check if more insects are present. If you see multiple insects or find droppings and egg cases, an active infestation is present.
Can Cockroaches Fly?
The German cockroach has wings but cannot fly. The American cockroach can fly short distances but is rarely found in German households. The Oriental cockroach is unable to fly. In general, cockroaches spread primarily by crawling and through accidental introduction.
How Quickly Do Cockroaches Reproduce?
Very quickly. A female German cockroach produces 4–8 egg cases (oothecae) during her lifetime, each containing 30–40 eggs. Development from nymph to adult takes only 6–8 weeks under optimal conditions. Theoretically, a single cockroach can establish a population of several thousand individuals within a year.
Does Cold Help Control Cockroaches?
Cockroaches are sensitive to cold and die within a few hours at temperatures below –5 °C. In practice, cooling rooms is hardly feasible because water pipes could freeze. More effective is the combination of thorough cleaning and professional insecticides like Afanisep 25 WP.
Summary: Combating Cockroaches – The Most Important Steps
Successfully controlling cockroaches requires thoroughness and persistence. Begin with intensive thorough cleaning to deprive the cockroaches of food and water. Use sticky traps to assess the extent of the infestation and identify main pathways. Treat all hiding spots with professional insecticides such as Afanisep 25 WP or Alfasect Spray. Seal all cracks and crevices and maintain consistent hygiene measures to prevent future infestations. In multi-unit buildings, coordinated control of all affected units is essential.
