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German Cockroaches
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German Cockroach Identification & Prevention

This cockroach is the most common and economically essential cockroach species.


The German cockroach is the most important cockroach pest species because of its high reproductive rates, small size, and ability to adapt and survive under almost any condition. Before the new millennium, German cockroaches were the number one pest species throughout the United States. However, the advent of cockroach baits made their control significantly easier. German cockroaches can transmit allergens and diseases to humans, with the young, the elderly, and those with weakened immune systems being most susceptible.

Biology And Behavior

  • German cockroaches are 5/8 of an inch in length and brown with two dark lines near its head.
  • The adult cockroach carries egg capsules until they are ready to hatch.
  • Egg capsules contain 36 to 40 eggs per capsule and hatch in 28 days.
  • They spend much of their life indoors in kitchens and bathrooms.
  • They will frequent unsanitary conditions.
  • They can rapidly infest and proliferate homes, restaurants, and other establishments.
  • They are more active at night (nocturnal).
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German Cockroach Prevention Tips

Preventing a German cockroach infestation before it starts is the key to controlling them.

Here are a few prevention tips to try and deter these pests at your property:

  • Remember the three W's when inspecting: wood, warmth, and water.
  • Remove food and moisture sources (i.e., sinks filled with dirty dishes, food spills).
  • Seal cracks in floors, walls, and ceilings with a sealant.
  • Fill window and door frame gaps and utility openings with a sealant.
  • Remove garbage daily and store containers outside.
  • Keep food containers closed and well sealed.
  • Look beneath the base and in control panels of water heaters.
  • Eliminate cluttered areas (i.e., corrugate boxes stored in corners).

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Helpful Articles About German Cockroaches