Place dust in cracks and crevices.
Dust attic for flies.
No fog dust or spray in the world will get to anything there.
To be for sure successful attic treatments are still a challenge for pro or diy alike even with some of the best equipment.
Attic flies which are also known as cluster flies are insects that often migrate into homes in the fall where they hibernate for the cooler fall and winter months one of the best tips for getting rid of attic flies is to keep them from entering the house in the first place as trying to eliminate them after they are in hibernation can be difficult.
Inject diazinon or bendiocarb dust into window pulley openings and wherever possible into wall voids and other confined spaces where the flies may be hibernating.
To kill the flies that buzz about rooms use a synergized pyrethrins spray or aerosol.
Then once the relentless heat zaps the pesticides strength life goes right back to normal for the pest no worse for the wear.
A diazinon spray or dust may also be used for longer residual action.
Do not apply too much dust at once or the dust will not be effective as cluster flies will avoid piles of dust.
Remember attic flies want to cluster indoors when it starts to get a lot cooler outdoors.
Fly lights plug into standard outlets and can be placed in attics basements and rooms that are not often used like guest bedrooms.
Steps for cluster fly control.
Follow these specific steps to get rid of cluster flies.
Spray as best you can around your roof chimney eves ventilation holes etc.
Use a fly light.
Spray insecticide where cluster flies hibernating.
Say no to gaps.
Identify where they are.
These guys will be repelled by the chemicals and retreat from going in your attic.