Blow flies are also known as bluebottle flies, and their name originates from their iridescent colors that are similar to colored bottles.
|Color||Black blow flies have a bluish-green luster; green bottle flies are metallic blue-green; blue bottle flies have a metallic blue quality.|
|Size||Adults are 1/4-1/2" in length. The larva are similar to house fly larva in all respects except size. Blow fly larvae are 3/4" when mature.|
|Appearance||They are easily identified by the metallic sheen of their stout bodies.|
They are infamously known for burrowing themselves into their food, which is where they develop. They are usually the first insects to arrive after an animal dies, preferring to feed on fresh or decaying meat and animal carcasses.
They are often seen hovering around garbage cans and are attracted to pet feces and dead animals. Blow flies get into homes through open doors, windows, or small cracks in walls in search of food. Once inside, blow flies find a meal and begin to deposit eggs on its surface. They prefer temperatures between 62-100 degrees.
Females may lay 550 to 2,400 eggs in her lifetime. Eggs are laid on meat, fish or carrion, but it is also possible animal manure, garbage or rotting vegetables may be used. Eggs hatch in less than a day and the larvae develops rapidly, molting three times within three or four days. The developmental time from egg to adult is 10-15 days. As an adult, they live for 7-20 days.
Aside from their annoying buzzing, these flies can transfer infections to humans through contaminating food and food preparation surfaces or coming into contact with an open wound on people, livestock or pets. When the insects feed, pathogens attach to their bodies, easily spreading dysentery, eye infections, and other illnesses.
Prevention & Control
The most important tip to control blow fly infestations is sanitation because it eliminates larval breeding sites. Emptying and cleaning trash receptacles disrupts the fly development cycle and reduces populations. Self-closing doors, screening, and caulking have proved to be useful in controlling populations.
A Batzner Service Specialist will perform a thorough inspection to look for potential breeding sites. An exterior treatment is performed to dumpsters and trash bins to prevent resting and breeding of blow flies.