The oriental cockroach, Blatta orientalis is a peridomestic species of cockroach that is believed to have originated from Africa and thereafter spread throughout the world. It has lower fitness than the German cockroach in areas where they coexist.
• Oriental cockroach
• Black beetle
Morphology of the Oriental Cockroach
Blatta orientalis is dark brown or black in color with a glossy body. Adults of this cockroach are 25 to 33 mm in length. Males have wings that cover about 2/3 of the body. The wings of the female on the other hand are brachypterous and undeveloped. Both sexes are incapable of flying. The oriental cockroach is similar to the Florida wood cockroach and is sometimes mistaken for it.
Behavior and Diet of the Oriental Cockroach
This species of cockroach is often associated with damp and wet environments, such as in decaying organic wood, water meter boxes. It prefers cooler temperatures than other species of roaches. Blatta orientalis is also found in trash cans, sinks and toilets. The mobility of this species of cockroach is restricted and is less active during the day. Both sexes are mostly active during the night. This species does not fly but is a good runner. They usually move into building at night in the search of food. The oriental cockroach is not capable of flying and cannot climb on smooth surfaces. This roach have tremendous ability to adaptation. The optimum growth temperature is between 20 and 29C.
Distribution an Habitats of the Oriental Cockroach
The oriental cockroach used to be endemic in countries around the Black sea and the Caspian sea. This pest is now widely distributed in urban environments. In the United States, the oriental cockroach is a major household pest in the Northwest, Midwest and the Southern part of the country.
Life Cycle of the Oriental cockroach
The ootheca (egg case) of Blatta orientalis is 8 to 10 mm in length and each contains about 16 embryos in average. It is usually deposited on a substrate just one day or two after mating. It takes about 2 months for the embryos to develop into nymphs but their development into fully mature adults is typically slow and takes about a year or two depending on environmental conditions. Usually females deposit their ootheca in debris or in food located close to where they are sheltered. Each female can produce 200 offspring per year. Adults can live for several months but rarely exceed one year.
How to detect the oriental cockroach
Blatta orientalis is a very elusive cockroach. It is often hard to detect because of its nocturnal activity. In general the sign of cockroach infestation is their ootheca also known as egg case. The ootheca of the oriental cockroach is blackish-brown and is often the obvious sign that professional pest inspection agents look for. Oriental cockroaches can sometimes be hard to eradicate. The most common method of exterminating this pest is through application of residual insecticide.
Control of the Oriental Cockroach
Some control products are only efficient on certain species of cockroach for which they have been designed. The oriental cockroach can be controlled in a number of way. A gel or granular bait can be used. It is important to make sure that the bait is not in the reach of children or pets in your house. Insect growth regulator and residual insecticides can also be used for the extermination of the oriental cockroach. Insect growth regulator are synthetic chemical that interfere with the development of the species and are efficient on immature stages of the cockroaches. With residual insecticides, it is possible to achieve to total control of this pest.