Blow flies are among the most noticeable fly species that can be found inside a home. Their relatively large size and metallic coloration often attract immediate attention.
In Gatineau, Val-des-Monts, Cantley, Chelsea, and throughout the Outaouais region, the occasional presence of one or two blow flies is generally not a cause for concern. However, when large numbers suddenly appear indoors, it may indicate an underlying issue that requires investigation.
In many cases, their presence is associated with a source of decaying organic matter, sometimes hidden within the structure of the building.
How can you identify a blow fly?
Blow flies are relatively easy to identify thanks to their distinctive appearance.
Key characteristics include:
- Size generally ranging from 10 to 14 mm;
- Robust body;
- Metallic blue, metallic green, or shiny blue-green coloration;
- Prominent eyes;
- Fast and noisy flight.
They are often observed:
- Near windows;
- Around light fixtures;
- In attics;
- In basements;
- Near walls where they are attempting to reach the light.
Their metallic appearance generally makes them easy to distinguish from common house flies.
Why do blow flies appear in your home?
Blow flies seek out decaying organic matter in which to lay their eggs.
Their larvae typically develop in:
- Animal carcasses;
- Decaying organic matter;
- Certain accumulations of waste;
- Hidden biological sources.
When large numbers of blow flies suddenly appear inside a home, one possible cause is the presence of a dead animal in:
- A wall;
- A ceiling;
- An attic;
- A crawl space;
- A chimney;
- Another concealed area within the building.
However, other sources may also be responsible. An inspection is often necessary to accurately identify the origin of the problem.
Are blow flies dangerous?
Blow flies do not cause damage to the structure of a home.
However, like many other fly species, they can pose a contamination risk when they move between sources of organic matter and surfaces used by occupants.
They may:
- Contaminate food products;
- Soil food preparation surfaces;
- Become a significant nuisance when present in large numbers.
A large fly population may also indicate an underlying issue that should be addressed promptly.
Why does the problem keep coming back?
As long as the breeding source remains present, blow flies will continue to emerge until their life cycle is complete.
If the organic matter responsible is not located and removed, new flies may continue to appear for several days or even several weeks.
Treatments that target only adult flies often provide temporary relief without eliminating the true source of the problem.
This is why identifying the source remains the most important step.
What should you do if you have blow flies in your home?
If you notice only a few isolated flies, it may simply be a temporary occurrence.
However, when a large number of flies suddenly appears, we recommend:
- Monitoring the areas where fly activity is greatest;
- Checking attics, basements, and infrequently used spaces;
- Avoiding focusing solely on eliminating visible flies;
- Quickly searching for the source of the problem.
The sooner the source is located, the more effective the resolution will be.
Our solution
At Maranda Pest Control, our service begins with a thorough inspection to identify the true cause of the infestation.
Our assessment allows us to:
- Confirm the species involved;
- Determine the level of activity;
- Identify problem areas;
- Search for potential breeding sources;
- Recommend appropriate corrective measures.
Depending on the situation, various strategies may be implemented to eliminate the existing flies and address the source responsible for their appearance.
Our goal is always to resolve the problem at its source and prevent future infestations from recurring.
Need help with blow flies?
Whether you are in Gatineau, Val-des-Monts, Cantley, Chelsea, L’Ange-Gardien, or anywhere in the Outaouais region, our team can quickly identify the origin of your problem and implement an appropriate solution.
Contact Maranda Pest Control for a professional inspection and discover why these flies are appearing in your home before the situation worsens.
