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Flies (Green, Blue Blow, & Bottle Flies)
Flies (Green, Blue Blow, & Bottle Flies)

Flies (Green, Blue Blow, & Bottle Flies)


  • Color: black blowfly – dark metallic green; green bottle flies – metallic blue-green; and bluebottle flies – metallic blue. Larvae (maggots) – cream-colored
  • Size: 1/4 inch for the black blowfly to more than 1/2 inch for the bluebottle flies; mature larvae (maggots) are 3/8 to 7/8 inch long.
  • Sponging mouthparts.
  • Larvae (maggots) are legless, eyeless, and taper from the larger round rear segment to the pointed head which consists of a pair of mouth hooks.
  • Larvae have large spiracles on the posterior plate.

Green, Blue Blow, and Bottle Fly Habits:

  • Females lay from 540 to 2,373 eggs in their lifetime.
  • Eggs are laid in batches of 100 to 180 on meat, fish or carrion; blowflies are also attracted to animal manure, garbage, and rotting vegetable matter.
  • The larva and the pupa are the overwintering stages.
  • Development time (egg to adult): as short as 10 days but typically 15 to 20 days.
  • Blowflies can be found developing inside the decaying bodies of rodents and other dead animals within attics, wall voids, and chimneys.
  • Some species are strong fliers.
  • They are attracted to bright light.

Damage Caused by Green, Blue Blow, and Bottle Flies:

  • Blowflies seldom are a significant problem within structures but can be quite annoying because of their persistent buzzing.
  • The major health concern associated with blowflies is their ability to carry disease-causing organisms on their bodies.

Look for:

  • Fly specks (small black fecal deposits).
  • Larvae leaving the breeding medium in order to pupate.
  • Decaying organic matter or dead animal.
  • Areas where adults rest and congregate at night.

How to Control and Kill Green, Blue Blow, and Bottle Flies:

  • Sanitation, or source-reduction, is the most important step in blowfly control because larval breeding sites are eliminated.
  • Trash cans should be cleaned at least weekly in order in order to disrupt the developmental cycle.
  • In areas such as stables, barns, pet kennels, and poultry houses, animal feces must be spread out in order to dry and be disposed of weekly.
  • Insect-proof garbage containers, self-closing doors, screening, and caulking to exclude flies should be used.
  • Electric fly traps, sticky traps and other devices should be used to reduce adult fly populations indoors and out.

Innovative Pest Management serves the Washington, D.C., Northern Virginia, and Maryland area. Call us at (240) 755-0077 to schedule a free quote or appointment.