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German Cockroaches: Magic Exterminating Can Help!


By Ralph H Maestre BCE

© 2006 Sean McCann

German Cockroach - Blatella germanica

Size: Adult 13-16 mm


Ootheca: this is the egg capsule which is about 1/3 of an inch and contains up to 48 eggs. It is light brown. It is carried by the females until the day before hatching. The female will product 4-8 ootheca in her lifetime. Each egg capsule will contain 20 to 48 eggs. It usually takes 20 to 30 days from the time of initial formation of the first egg capsule until it hatches. It will take a shorter time under warmer conditions. Formation of the next egg capsule usually begins within a couple of weeks.

Nymphs: there are 6 or 7 nymphal stages, called instars, before they molt into the adult stage. The number of nymphal instars may increase under certain environmental conditions (poor diet, low temperatures, etc.) or if appendages, such as legs or antennae, are lost during the earlier nymphal instars. In the latter case, extra instars will occur to allow regeneration of these missing body parts. Completion of the nymphal stage under normal conditions requires 40 to 215 days, with an average of 103days (3 months). When the nymphs emerge, they are white in color until the pigmentation darkens them.

Adults: are pale to medium brown and about 1/2 to 5/8 inch long. They can be distinguished from other roaches be the two dark stripes on the anterior, dorsal portion (pronotum) of the thorax. Both male and female have well-developed wings, but they never fly. Adult females carry the egg capsule protruding from the rear of the abdomen until the eggs are ready to hatch. Females carrying the egg capsule are called gravid. Adult may live up to one year.

Unlike Asian Cockroach, females do not have wings long enough to cover the oothecae. Adults do not fly.

Cosmopolitan in North America

Infests human dwellings and workplaces


Omnivorous, eats just about anything edible

Like most cockroaches, the German cockroach is nocturnal. These cockroaches are a major pest of both residential and commercial structures. Some people can develop severe allergies to cockroach parts, feces, and oils.

Treatment Approach

After your inspection confirms the presence of German Cockroaches the technician may use the following techniques:

  • In most situations you should start with a baiting program.
  • Appling the bait using should be done with bait applicator into the crack and crevices around the kitchen cabinets. NO BAIT SHOULD BE VISIBLE.
  • Applying bait under the kitchen sink and behind all draws.
  • As well as under the dishwasher, refrigerator, and under the stove where accessible. DO NOT APPLY INSIDE THE STOVE.
  • Applying the bait in the bathroom around the vanity, behind mirrors, etc.
  • If other rooms show signs of infestations, then applying the bait into crack and crevices around moldings, door frames, closet doors, and behind furniture.
  • All other areas should be done upon consultation with the pest control service manager(s).
  • If a liquid application is required. Then preparation needs to be done by emptying all of the kitchen cabinets
  • The first choice should be a Non-repellant residual over a repellant. Unless it is required to flushing out the roaches.
  • Make sure to incorporate IGR (insect growth regulator) in the program.
  • Follow label direction when using the compressed air sprayer as crack and crevice or spot treatment.
  • Caution should be taken around pilot lights and radiators. Heat will vaporize the product and may cause health hazards. NEVER spray a radiator.
  • Aerosol sprayers are good for crack and crevice treatments or as a flushing agent. Do not use them as space sprayers.
  • Use the Actisol machine as a crack and crevice tool only.
  • If dust application is required. Dust should be used in such a way that it is never exposed to humans or their companion animals. Dust should always be use only as crack and crevice. Dust will give you a long residual.
  • If drilling is required, then make sure you fill in the opening made. Don't use a drill bit greater than 1/4".

Magic Pest Management has been battling the German Cockroach since the 1960s. This one insect has been making a comeback in the last several years due to the fact it has learned how to avoid the baits (bait aversion). Magic has the experienced personnel to solve a cockroach infestation in your home, work place, etc. Contact us today for a free estimate request.