Tuesday, May 10, 2011


German Cockroaches, Blatella Germanica
Adult German Cockroaches are about 17mm long and light brown except for the shield behind the head marked with two dark stripes, which run lengthwise on the body. The nymphs are wingless and nearly black with a single light stripe running down the middle of the back. Egg capsules are light tan.

Egg cases are carried by the femal until just before hatching and each female may produce 4-6 cases during her lifetime, each containing 30-40 eggs. Eggs hatch in 28-30 days, and nymphs develop in 40-125 days. Female cockroaches live about 200 days (slightly longer than the male).

The Oriental cockroach, Blatta orientalis, are usually dark reddish brown in colour, with the adults growing till about 25 mm long and the immature cockroaches (nymphs) resemble adults except that they are wingless.

Unlike other cockroaches, Oriental cockroaches cannot climb up smooth surfaces. They generally live in moist areas, but can survive in dry areas if they have access to water. They prefer cooler temperatures and are commonly found in basements, boiler houses etc.

Adult cockroaches can live up to one year, during which females produce and average 150 young. This cockroach prefers to feed on starchy foods but will adapt to survive.

The American cockroach, Periplaneta americana.
The adult cockroach are reddish-brown to dark brown (apart from a tan band around the shield behind the head) are are between 25-40 mm long. They have wings and are able to fly.

They are often found in damp sewers and basements etc. They can be transported into homes in boxes from infested properties.


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