German Cockroach

Scientific name: Blatella Germanica


The German cockroach is a small species of cockroach, around 11 to 16 mm in size. Adults are easily recognized by their light brown or tan colouration with two black horizontal stripes located on the pronotum immediately behind the head, and growing to a length of 11 to 16 mm. The young ones, or nymphs, are darker, almost black in colour, also with the black stripes behind their head.

The male has wings that cover the abdomen, while the female has wings that do not cover the abdomen completely. The male appears more slender than the female, the female appears wider.

The German cockroach requires less moisture than the American cockroach. Therefore, the Germans are most commonly found indoors of houses, restaurants, pubs & bars, food processing facilities, hotels, canteens, etc.

The German cockroach occasionally appears by day, especially if the population is crowded or has been disturbed. However, sightings are most frequent in the evening or during the night.


German cockroaches are omnivorous scavengers. They are attracted particularly to meats, starches, sugars, oily and fatty foods. When there is a shortage of foodstuffs, they may eat household items such as soap, glue, and toothpaste. In famine conditions, they turn cannibalistic, chewing at each other’s wings and legs.


German cockroaches are scavengers, capable of feeding on most or any food source available. These pests are known for their ability to capitalize on the availability of even the smallest amount of food by feeding on crumbs missed during cleaning, drops of beer stains on the floor or feeding on the dirty dishes left in the sink overnight.

German cockroaches are thigmotactic, meaning they prefer confined spaces, they prefer to hide within small cracks and crevices that are easy to overlook, thereby evading humans. Secluded areas to harbourage such as under and inside the cupboard, kitchen cabinets, behind refrigerator, ovens, beneath tables and sofas.
They are also known to secrete several odorous compounds. When populations are present in large numbers or felt being threatened, humans may be possible to detect a mild, or what some have reported as a “musty” odour.


German Cockroach Lifecycle
German cockroaches have three developmental stages: egg, nymph, and adult. Their entire life cycle spans approximately 100 days, although this is dependent on factors such as temperature, diet and injuries. Females produce an egg case (ootheca) which protrudes from the tip of the abdomen. On average, females produce 4–8 ootheca, and each ootheca contains 30 to 44 eggs during their lives. The egg is carried by the female until 1 or 2 days before hatching. The nymphs take about 30 to 60 days to mature into adults. An adult’s lifespan is more than 100 days.

Diseases and Risks

German cockroaches are also known for their ability to transmit several pathogens, including Salmonella, Typhus, cholera, rashes, diarrhoea and other viral infections. Recent studies have also indicated that in larger metropolitan areas, the development of asthma in children can be directly linked to the presence of German cockroaches.


Jaya Pest Solutions encourages people to help reduce cockroach populations by removing all leftover food and unnecessary water sources, sealing all cracks and crevices, have a properly covered rubbish bin, regularly cleaning of the drainage and waste disposal areas. To effectively manage a serious cockroach infestation, you must correctly identify the type of cockroach causing the infestation and the ability to diagnose the core problem, which is why it is important to contact a pest control professional.


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