German Cockroach Infestations

The German Cockroach (Blattella germanica)

What does a German cockroach look like?

They are brown with two dark stripes on thorax, they have wings that are body length or that slightly overlap in both the male and female cockroaches

Is it true that cockroaches carry disease?

Yes. Although there is no clear-cut evidence to implicate cockroaches with outbreaks of infectious diseases, some disease organisms which cockroaches have been found to be carrying include the following:

  • Salmonella – which causes food poisoning in humans
  • Mycobacterium tuberculosis – which causes tuberculosis
  • Entamoeba histolytica – which causes amoebic dysentry
  • Escherichia coli – which causes gastro-enteristis
  • Ancylostoma sp. – Dog and human hookworms
  • Taenia sp. – Tapeworms

How do you know if you have a cockroach infestation?

Cockroach marks:These are liquid excreta produced by cockroaches when water is readily available. The marks are usually brown, irregular in shape, often in the form of streaks and usually much larger than the circular marks left by the house fly.

Faecal pellets: These are produced when the is less water available (instead of liquid excreta) and usually found by wall-floor junctions where cockroaches tend to move along. The pellets are less than 2mm long and are usually brown or black.

Egg cases(oothecae): The empty egg cases of the German cockroach are often hidden in harbourages, unhatched oothecae are rarely found as they are carried by the female until just before they hatch.

Live Insects: Live or recently dead adults or nymphs trapped on insect detectors may help provide clues to the extent of the infestation.

What is the most favorable condition for German cockroaches?

The German cockroach species prefers hot and steamy conditions, thus the perfect place for them to infest would be around kitchen equipment, sinks, around water pipes and radiators, behind wall tiles, and in fridge and freezer motors.

How can German cockroaches be prevented?

The ERDM Principal can be applied to treating cockroaches. ERDM stands for: Exclusion, Restriction, Destruction, Monitoring

Exclusion: Prevent cockroaches from gaining access by inspections of laundry, deliveries, new appliances etc

Restriction: Good housekeeping, cleanliness and proper waste management will prevent a food supply for cockroaches

Destruction: Use of insecticides, fumigation and insect detectors

Monitoring: Constant monitoring to make sure that there is no further infestation