There are four distinct stages in the life of a fly : egg, larva, pupa and adult. Based on the temperature, it takes from 6 to 42 days for the egg to form into the adult fly. The length of life is normally 2–3 weeks however in cooler conditions it might be as long as three months.
EGG STAGE: The life cycle of a house fly starts in the egg organize. A female house fly is equipped for laying up to 150 eggs at once. Over a time of a couple days, she will deliver five or six bunches of eggs. Female house flies support soggy, dim surfaces, for example, fertilizer, excrement and other deteriorating natural material for egg laying. House fly eggs take after individual grains of rice. Eggs are normally laid in masses on natural material, for example, litter. Incubating happens inside a couple of hours. The youthful hatchlings tunnel into the reproducing material; they should get oxygen from the environment and can, therefore, survive only where adequate natural air is accessible.
LARVAE STAGE: The larvae of most species are thin, white, legless maggots that grow quickly, going through three instars.
Larvae first instar:
- Initially encourages on liquid radiated from the body.
- Haching takes 1 day.
Larvae second instar:
- Moves around in hatchling mass that offers protection
- Hatching takes 1 day
Larvae third instar:
- Greatly increases in size
- This takes around 2 days
The time required for development changes takes around three days to a few weeks, based on the species and also the temperature, sort and amount of food accessible.
PUPA STAGE: The pupa forms a capsule-like case, the puparium, inside which the transformation from larvae to adult happens. This normally takes 2–10 days, toward the end of which the fly pushes open the top of the case and works out and up to the surface. Soon after rise the fly spreads its wings and the body dries and solidifies.
ADULT STAGE: The adult fly is dark, 6–9mm long and has four dull stripes running longwise on the back. A couple days slip by before the adult is equipped for reproduction. Under characteristic conditions an adult female once in a while lays eggs more than five times, and from time to time lays more than 120–130 eggs on every occasion.