Oriental Cockroach

Oriental Adult Cockroach

Oriental Adult Cockroach

  • Size: About 2.5 to 3 cm long
  • Color: Dark brown to black
  • Distinctive Feature: Very shiny body
  • Habitat: Cool and humid places, such as cellars and sewers
Oriental Cockroach Nymph

Oriental Cockroach Nymph

Oriental Cockroach with Ootheca

Oriental Cockroach with Ootheca

Development Stages


The adult Oriental cockroach is dark brown to black, with a flat and oval body measuring about 20 to 25 mm long. Males have wings covering much of their abdomen, while females have shorter and less functional wings.

Adults are identified by their size, color, and the presence of wings in males. They are often found in damp and dark areas, such as under sinks, in bathrooms, or near plumbing. Their nocturnal activity and aversion to light make them more visible at night.

Nymph (Larval Stage)

Nymphs, which hatch from eggs, resemble miniature versions of adults but without wings. They go through several molts (usually between 7 and 10), gradually growing at each stage. Their color varies from light brown to dark brown.

Nymphs are recognized by their smaller size compared to adults and the absence of wings. They are often more active and can be seen feeding or moving in search of a suitable habitat.

Egg (Ootheca)

The eggs of the Oriental cockroach are grouped in a structure called an ootheca. This structure is dark brown and oblong, measuring about 10 mm in length. Each ootheca typically contains about 16 to 18 eggs.

Habitat of the Oriental Cockroach

The Oriental cockroach is often associated with damp, cold, and dark environments. They are frequently found in places such as cellars, basements, pipelines, sewers, and compost piles. Inside houses, they can be found in bathrooms, kitchens, and other areas where humidity is high. These cockroaches prefer to stay close to the ground and are rarely found at heights. They are less dependent on human presence than some other cockroach species but can enter homes in search of food.

Behavior of the Oriental Cockroach

The Oriental cockroach is known for its varied diet, feeding on organic waste, human food, paper, fabric, and even feces. They are primarily active at night and spend the day hidden in their damp and dark shelters. These cockroaches are particularly slow and not as agile as other species. Their reproductive cycles are slower compared to other cockroaches, but females can produce a large number of eggs over their lifetime. Their presence is often indicated by a characteristic and unpleasant odor, as well as droppings in the form of small dark capsules. Their adaptation to difficult living conditions and their ability to survive in very humid environments make them particularly resistant and difficult to eradicate once established.

Distinguishing the Oriental Cockroach from Other Pest

German Cockroach

German Cockroach

The German cockroach is noticeably smaller than the Oriental cockroach, usually measuring between 13 and 16 mm. It also differs in its lighter color, generally a yellowish-brown, and by two dark longitudinal bands on its pronotum (the part just behind the head). Unlike the Oriental cockroach, the German cockroach is more common in kitchens and areas where food is stored.

Brown-Banded Cockroach

Brown-Banded Cockroach

The brown-banded cockroach is smaller than the Oriental cockroach, measuring about 10-14 mm long. As its name suggests, it is distinguished by the presence of light brown bands on its back. It is also lighter in color than the Oriental cockroach, with a light brown or yellowish hue. This species prefers drier environments, which distinguishes it from the preferred damp habitats of the Oriental cockroach.



The earwig is easily distinguishable from the Oriental cockroach by its characteristic pincers or cerci at the end of its abdomen. It is also smaller, with a length generally ranging between 12 and 20 mm, and has a more elongated and narrow body. Its color varies from light brown to reddish. Earwigs prefer humid environments but are often found outside, unlike cockroaches which are indoor pests.

American Cockroach

American Cockroach

The American cockroach is significantly larger than the Oriental cockroach, reaching up to 40 mm in length. It is reddish-brown in color with a shiny pronotum. The American cockroach prefers warm and humid environments but is more frequently found in places like basements and sewers, unlike the Oriental cockroach which favors indoor living spaces.

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