Black Cockroaches are also known as Oriental Cockroaches. These are called black because of their appearance. These are considered as filthier than any of the other roach species. They are most active early in the evening and are located at ground level. They are a common household pest in the Midwest, Northwest, and Southern United States.

Where do they occur

  • They prefer commercial buildings associated with the production or handling of food because ample sources of food are available there.
  • They often take shelter in basements, crawl spaces, utility rooms, sewers, and old incinerators as these places do not have frequent visitors.
  • Due to the cold environment, they are commonly found under refrigerators, sinks, washing machines, and floors.
  • They also survive quite well outdoors in firewood, leaf litter, sheds, doghouses, and similar locations due to the capability to bear hot weather conditions. 

Favorable Weather conditions for Survival

They survive in areas with summer heat and moderate winters, which makes them common species in South Africa. Oriental cockroaches prefer to stay outdoors in warm weather, but they move indoors during droughts that seek higher humidity.

Description

Latin Name: Blatta orientalis

These are shiny black to dark reddish-brown. They are about 1 inch in length. The wings of the males do not extend until the end of the abdomen. The wings of the females are reduced to short stubs at the back of the thorax. Though there are wings, they do not fly. The oriental roach is less cautious and more sluggish than other cockroaches.

 What do they eat?

Black Cockroaches feed on anything and everything which ranges from all kinds of food to decaying organic matter but prefers food that is rich in carbohydrates. Oriental cockroaches tend to produce an unpleasant odor when feeding and gathering in crowds.

Life cycle

Eggs

The female may carry the brown egg sack for thirty hours, with up to sixteen eggs laid in the tablet. The average number of nymphs to hatch per egg capsule is 14.4. Each female roach deposits an average of eight egg sacks. The egg capsule is stored in some warm sheltered spot where food is readily available. In this species, the female cockroach does not assist her newly born young. At room temperature, the incubation period averages 60 days.

Young Cockroaches

 Nymphs emerge 6-12 weeks later and progress through 7-10 molts before reaching maturity, a process that takes ten months-2 years depending upon temperature and food supply. With each successive molt, the wings, antennae, and cerci develop, and the nymph becomes progressively more like the adult.

Adults

 The adults appear in May, June, and July, and the nymphs are more and more evident during summer months. Adults usually do not mature during October, November, and December. 

Adults live approximately 4.5 months at 25°C. The slow proliferation of these roaches will limit its success, where reasonable standards of hygiene exist.

How to prevent them

  1. Clean up food crumbs and spills as cockroaches do not prevail in hygienic places.
  2. The use of sticky traps can be of great rescue to capture and prevent existing roaches.
  3. Clean up all the sources of food and water that could attract roaches.
  4. Fix leaky and faulty water pipes.
  5. Increase the ventilation of your house to prevent condensation.
  6. Reducing the humidity and increasing the light in problem areas will help control roach infestations.
  7. Applications of insecticides around building perimeters, in drain openings, or sewer openings will help to control these black cockroaches.
  8. Installation of door sweeps, keeping thresholds tight, sealing gaps, and screening vents will help to keep oriental cockroaches out of buildings.

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