Need pest help? Save $50 on your first recurring service today with code GET50

Where are these giant house flies coming from?

Question: For the past week, we keep seeing hordes of giant house flies flying out of our laundry room. We can't find where they're coming from or why. They always appear on the fluorescent light fixtures, and every time we kill them all, a few hours later there are more. How do we figure out where these are coming from?

Answer: What you have seen may be cluster flies. They are sometimes mistaken for the common house fly, but they have a completely different life cycle. These flies are very common inside houses, especially during the early spring.

The life cycle of the cluster fly (Polenia rudis) begins in the spring when they leave the overwintering sites (attics and wall voids of houses) and lay their eggs in the soil. The larval or maggot stages of this fly attack and eat earthworms. There are several generations of cluster flies during the summer. Each time the female returns to lay eggs in the soil. However, the flies of the last generation (mid to late August) will spend the winter in a protected location, and start the life cycle over again in the following spring.

Cluster flies begin searching for a place to spend the winter during the last month of summer, usually in late August and early September. They will gather on the sides of houses that are warmed by the afternoon sun. They collect there by the hundreds or thousands. Some of the flies find openings and make their way inside the house. They spend the winter inactive until the temperature goes up.

Control of these flies is not easy. Call us and a highly trained Orkin Pest Specialist will conduct a thorough inspection, assess the extent of the infestation and develop a customized solution backed by science.

Related Questions

Orkin used the information above to also answer the following questions submitted by Orkin.com users:

Question: Do you have a treatment for house flies?

Question: I have house flies caked on the outside of my house. I have a black tin roof and white siding. Is this normal? If not, is there anything that can be done about them? They are swarming, it sounds and looks awful.

Ask Orkin

Get More Answers from Orkin

How do I get rid of tiny red bugs in my bathroom?

Q

I looked online, and it sounds like they are chiggers. If this is what they are, is there something that can be done?

How do I get roaches out of my car?

Q

How do I get roaches out of my car?

How do I kill house lizards?

Q

How do I kill house lizards?

Should I buy a house with beam damage from insects?

Q

Could it be ants instead of termites causing the damage?

Long, brown, hard shell bug that jumps

Carpenter Ant Infestation in the House

Q

Large carpenter ant infestations can cause structural damage to your home. Make sure your home is protected from carpenter ants with Orkin.

Spraying for bed bugs did not work

Q

If the neighboring unit has bed bugs, am I looking at being sprayed every three months?

What Do Bed Bugs and Eggs Look Like on Clothes?

Q

What do I do with the clothes?

Do you use super heating to kill bed bugs?

Q

Do you use super heating to kill bed bugs?

Rat Mite Bites vs. Bed Bug Bites

Q

Learn how to tell the difference between rat mites and bed bug infestations. Call an Orkin Pro for help with mite and bed bug control.

Connect with Us

Our customer care team is available for you 24 hours a day.

877-819-5061

Find a Branch

Our local Pros are the pest experts in your area.

Get a Personalized Quote

We will help you find the right treatment plan for your home.

THE BEST IN PESTS.™

SERVICES

Pest ControlTermite ControlPrevent and Protect

PEST LIBRARY

Browse All Pests

© 2024 Orkin LLC

Terms of UsePrivacyAccessibility StatementCareers

Your Branch  

Call Now