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Roach Identification Chart

Bug Lady posted this on Oct 8, 2016



German Cockroach (Blattella germanica)

  • Adults average 1/2 to 5/8 inches in length
  • Nymphs average 1/16 to 1/2 inch long
  • Tan to light brown; two longitudinal stripes on the pronotum
  • Females are larger than males and may have an egg case protruding from the end of their abdomen
  • Egg cases contain 30 to 40 young; each egg develops into an adult within 50 days

American Cockroach (Periplaneta americana)

  • Adults average: 1 1/4 to 2 1/8 inches in length
  • One of largest species to infest structures (also known as water bugs or Palmetto bugs)
  • Found in northern and southern climates; thrive outdoors in the South
  • Males’ wings extend beyond the abdomen; females’ wings do not
  • Prefer dark, moist areas near food sources and may enter structures through sewer pipes and floor drains
  • Seek harbor in voids, including masonry block voids, and may travel in areas above drop ceilings
  • Males can fly and are attracted to artificial light

Australian Cockroach (Periplaneta australasiae)

  • Adults can grow up to 1 1/4 inches long
  • Closely resembles American cockroach in size and color
  • Has pale yellow stripes at the base of wing pads and the margin of the protonum
  • Not commonly found indoors but will be found there when temperatures are high
  • Can be brought into accounts on indoor plants and may be found everywhere American cockroaches are active (except sewers)
  • Also infest greenhouses, zoos and commercial accounts where conditions are suitable

Oriental Cockroach (Blatta orientalis)

  • Adults to grow up to 1 inch in length
  • Distinctively shiny and black
  • Males’ wings take up 2/3 the length of the abdomen; female wings take up 1/4 the length of the abdomen
  • Does not fly and has difficulty climbing smooth surfaces
  • Susceptible to dehydration; seeks moist areas in which to hide
  • Usually found in basements, crawl spaces and the lower floors of an account
  • In southern climates, may be found outdoors hiding in leaf litter, beneath logs, and mulch

Smokybrown Cockroach (Periplaneta fuliginosa)

  • Adults range from 1 1/4 to 1 1/2 inches in length
  • Easily recognized by its uniform mahogany brown color
  • Found outdoors in the South
  • Hides in mulch, leaf litter, ground cover, woodpiles and tree bark for protection against dessication
  • Often found dead indoors likely due to dehydration
  • Typically enters a structure through the attic and open spaces
  • Both males and females can fly

Brownbanded Cockroach (Supella longipalpa)

  • Adults average 5/8 of an inch in length
  • Similar in size and appearance to the German Cockroach
  • Rather than longitudinal stripes found on the pronotum, they have two broad brown bands on their wings
  • Infest structures across the United States
  • Prefer warmer areas but may be found in any area within a structure
  • Not generally found in kitchen and bath areas, as can be expected with German Cockroaches
  • May be found in furniture, wall hangings, picture frames, light fixtures, and drop ceilings
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