They use the attic as an overwintering site.
How to stop flies in attic.
Cut the top off a plastic pop bottle a third of the way down put a little water and something disgustingly fly attractive in the bottom half re insert the top half without lid upsidedown into the bottom half and hang somewhere.
This dispenser contains a pyrethrum based insecticidal spray which will activate at several intervals over a 24 hour period.
Remember attic flies want to cluster indoors when it starts to get a lot cooler outdoors.
To make your sugar water fly trap all you need is a wide mouthed jar some sugar water and a paper cone.
Place traps around attic windows to catch flies.
To ensure that the attic is home to only old family keepsakes homeowners should follow these easy to do pest proofing tips.
Using sugar water fly trap.
Larger and slower than house flies cluster flies can be a nuisance around homes often getting inside and laying eggs.
This causes cluster flies to keep coming back just when you think you may have gotten rid of them.
If you believe the vents in your attic offer an entry point for these pests try placing a screen over them.
First start outside by trimming any overhanging tree branches and overgrown bushes and vines near the home that could allow rodents to access the roof.
Use light traps to catch larger flies.
Flies are lured in by the light and then trapped on a glue board or killed by an electric shock.
Place your light traps approximately 4 6 feet 1 2 1 8 meters above the floor.
This is effective at killing cluster flies as they enter to hibernate.
Cluster flies move indoors often into attics when the days shorten and the weather cools.
Remember it only takes a hole the size of a rice grain for a cluster fly to enter.
First of all pour the sugar syrup in the jar and then cut a 1 cm diameter hole at the apex of the cone.
Spraying the exterior of the house with insecticide can also be effective.
Uv light traps are ideal for catching houseflies and other relatively large species of flies and pest insects.
Pest insect prevention tips for the attic.
Go through your home and look for holes gaps and cracks where a small cluster fly could enter.
The most effective way to get rid of attic flies is to make sure that they stay outdoors.
An alternative way to kill cluster flies is by using the prevent auto dispenser.
Cluster flies or attic flies are large black flies and similar in size shape and behavior to the blowfly.
Do this in the summer or early fall at the latest.
You can make your own flycatcher.
Now place the cone in the jar upside down so that it should not touch the liquid.
Spray as best you can around your roof chimney eves ventilation holes etc.