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Blow Flies

 

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Texas A& M Entomology
A blow fly, Calliphora sp. (Diptera: Calliphoridae).
Photo by Drees.

Description:

They are found worldwide, occurring nearly every place inhabited by people. The name blow fly comes from the bloated condition of the rotting animal carcasses that their larvae, known as maggots, infest. The most frequent species found under these conditions is the common blow fly.
These flies are common in populated areas and are may be found near meat-processing plants, garage dumps and slaughterhouses.

Blow Flies also include a number of species including the common bluebottle fly, Calliphora vomitoria (Linnaeus) the green bottlefly, Phaenicia sericata (Meigen) and others.
Blow flies are slightly larger than true house flies, and the bodies of many are metallic blue or green in color. Worldwide, there are about 1200 species of blow flies, and in North America there are 80. In many areas such as the American Southwest, blow flies are the most common type of flies found in and around houses and other human habitations. Blow flies range in length from 7 to 16 mm (0.28 to 0.63 in); they have robust bodies and wide heads.

Biology and Habits:

Blow Fly, any of a large family of flies known for the habit of the larvae, or immature flies of, infesting animal carcasses.
Adult blow flies feed primarily on flower nectar, plant sap, and other sugary materials. The female blow fly typically lays her eggs on the body of a recently killed animal. The eggs hatch quickly and the maggots then feed on the decaying tissues. In warm weather, some species can complete their larval growth within a week. They then burrow into the soil and pupate, to emerge later as adult flies. Blow flies play an essential role in nature by decomposing dead tissue. The species of blow fly is an exception: its larvae prey on earthworms.
Blow flies have played a role in medicine: species such as the green bottle fly and the black blow fly were once commonly used to clean open wounds in humans because the maggots tend to feed only on decayed tissue. The maggots then feed on the animal's healthy tissue. Because blow flies routinely move between dead animals or dung and human habitats, they may transmit disease organisms to people, including the bacteria that cause dysentery, typhus, and cholera.

Blow Fly Inspection

Eggs are usually laid on meat or dead animals, although they may be placed in decaying vegetable material when meat is not available.
Some blow fly species, such as the screw worm fly, lay their eggs on living animals.
Most of these flies found indoors originate from an outside source because of their breeding preferences.
Garbage cans are a huge source for blow flies. Single cans have produced more than 30,0000 flies in a week.
 
If there is a large number of blow flies inside, it most likely is a sign of a dead rodent or bird.
Finding the source of the animal or bird is often more difficult because it has been dead several weeks by the time the flies appear.
If a dead animal odor is present, it may help narrow the search area.
Look for signs of dead rodents or birds that may have been living in walls or crawl spaces, or even living in lower cabinets and under major appliances.
Fly larvae often will crawl along a wall until they encounter a corner where they then pupate.
Numerous pupae in a corner indicate the breeding source is near.
If the flies are found inside the light covers in the ceiling, it means the flies emerged either in the ceiling or from the wall. The breeding source might be either in the ceiling or a wall. Outdoors, inspect the area for dead animals; any nearby dumpsters or other garbage containers should be inspected.

Recommended Control and Elimination Measures for Blow/Bottle Flies

Blow/Bottle Flies rarely require chemical control.

Blow flies breed in damp organic material such as garbage and dead animals, therefore most of these pests found indoors actually originate from an outdoor source.   Small numbers of Blow flies in a structure usually point to an outdoor source.   If large numbers of these flies are found indoors, it may be a sign of an indoor infestation.  Indoors, look for signs of dead rodents or birds that may have been living in walls or crawl spaces, or even living in lower cabinets and under major appliances.  Outdoors, inspect the area for dead animals; any nearby dumpsters or other garbage containers should be inspected.

 

Exclusion and Sanitation, Insecticides, Traps, and Aerosols

1. Exclusion and Sanitation:

  • Locate and eliminate all possible breeding sources.  Blow/Bottle flies feed and breed on dead animals and garbage. Whenever possible, food and materials on which the flies can lay their eggs must be removed, destroyed, as a breeding medium, or isolated from the egg-laying adult. Killing adult flies will reduce infestation, but elimination of breeding areas is necessary for good management
  • Proper sanitation measures must be taken with dumpsters and rodent control with flesh flies.
  • Exclude Blow/Bottle Flies from a structure with proper screening and maintenance of doors and windows.

  • A space spray cb 80 CB 80 Pyrethrin Aerosol

    (Pyrethrin spray) can be used as a quick kill, reducing populations of flying insects.

  • Garbage cans and dumpsters should have tight-fitting lids and be cleaned regularly.

  • Drainage will often aid control, getting rid of extra moisture.

  • Openings of buildings should be tightly screened with screen.

2. Insecticides : Residual, Aerosols, and Fogging, if necessary


House flies rest on sunny surfaces in the daytime, and have a tendency to come inside or under eaves at night. These areas where the flies are resting can be sprayed with residual or contact insecticides.
The flies rest on the sprayed surface and pick up enough insecticide to kill them.
When spraying the surfaces, it should be wet enough to the point of runoff, but not enough to form puddles.
Recommended residual Insecticides:

d-fense
D-Fense

cyper wp

Cyper WP  

Cyper wp is a wettable powder, mixed with water to spray exterior surfaces where flies would land, sprayed once a month. Wettable powders will show up visible on dark surfaces.

The D-Fense will not leave a visible residue

 

Aerosols
Hand held space sprays for a quick knock down would be pyrethrin contact aerosols:
A space spray cb 80 CB 80

(Pyrethrin spray) can be used as a quick kill, reducing populations of flying insects.

On Time Metered Aerosol /  Automatic Dispenser   is an automatic dispenser to be used with the the On Time Metered Insect Killer.
The On Time Mist Automatic aerosol will last 30 days.

Fogging Insecticides-Non Residual
If you find that fogging inside a building would be necessary, we also carry fogging material and professional fogger equipment:
Fogging Compounds and Equipment

3. Trapping-Glue and Outside

Fly Paper-1 ribbon=3 ft.x1 inch strip of sticky paper .

Window Fly Trap-allows you to use a trap to stick on the window, without using an insecticide.

catchmaster fly trapCatchmaster Fly Trap Disposable Fly Traps is an excellent trap for the outside, with a unique attractant lure included.
It will trap house flies, blow flies and a broad range of other fly species. Place the Catchmaster disposable fly traps and the fly baits away from areas that you want to see flies, in that they have attractants that will draw the flies.
You will want to place the outside Catchmaster disposable trap in sunny area on cooler days and shady areas on warmer days.

3. Electronic traps: Inside Use

These electronic fly traps are very efficient and functional to be used inside only.

Click Here: All Electronic Fly Traps

fly web
Fly Web Light

Its compact size and direct plug-in features allow the light to be placed in any outlet

genus spectra fly trap

Genus Spectra Fly Light

Wherever you encounter heavy flying insect activity, either in non-public or public areas, the superior performance of the Genus Spectra provides the type of control you need. It provides an ideal solution for establishments seeking highly effective catch, a contemporary appearance and versatile placement options

 matrix ii fly trapMatrix II Four Seasons Light Trap -Matrix II Four Seasons Light Trap by B&G Equipment Co. Made in USA The first true flexible light trap designed to handle all different levels of fly problems Comes in white or black

 

Click Here: All Electronic Fly Traps

 
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