Insect

Blow Flies

Blow flies undergo complete metamorphosis, laying eggs in carrion that hatch within 1–2 days. Larvae grow to 18 mm, pupate in 1–2 weeks, and adults can reach 11 mm in length. Strong odours attract them to decomposing material. Larvae are whitish and legless, while adults vary in colour, including metallic blue, green, or striped grey and black with red eyes. Commonly found in meat factories and sites with dead animals, signs of infestation include unpleasant smells from larvae and the presence of adult flies.

Facts

Name: Blow Flies, Calipohora spp, Lucillia spp, Sarcohpaga spp
Life cycle: Complete metamorphosis
Egg: Laid in clusters on or near carrion; hatch within 1–2 days
Larvae: Whitish, legless, and equipped with a hook-like proboscis; grow to 18 mm and typically reach pupation within a week after up to three moults
Pupae: Develop inside reddish-brown cases over 1–2 weeks, usually located away from the carrion in dry environments
Adult: Emerge at up to 11 mm in length; possess an acute sense of smell and actively seek carrion; lifespan varies depending on ambient conditions
Description:
Adult blow flies exhibit distinct colouration depending on species:
Calliphora – Metallic blue body
Lucilia – Metallic green body
Sarcophaga – Grey and black striped thorax with bright red eyes
Habitat:
Blow fly larvae are found wherever carrion is present. They are frequent pests in meat processing facilities, slaughterhouses, and locations with decomposing animal matter, including rodent carcasses.

Signs of infestation

Odour: Larvae produce ammonia during moulting, resulting in a strong and unpleasant smell around carrion
Activity: Adult flies are often visible flying in affected areas, particularly near entry points or waste zones

References

The British Pest Management Manual. Section 5, pg 161.
Lab notes, Tarakan International.

Blow Flies

Facts

Signs of infestation

Products

Capabilities