How to Get Rid of Cluster Flies
Pollenia Rudis, or as it is commonly known, the cluster fly is rarely a problem during the spring or summer months as they prefer the outdoors where there is plenty of warm sunshine. However during the fall they will often begin to seek shelter inside of houses where they will often die off, but not before they lay thousands of eggs in cracks in the floors and in between walls. They pose no immediate threat but they can carry disease (although rarely). Here are a few ways to prevent and get rid of them.
Spray During the Fall
At the beginning of Autumn have your local exterminator spray your house for the cluster flies. This is the BEST way to prevent ever having to deal with them as it will not only kill the flies that come into the house but also any eggs they may try to leave behind.
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Bifen IT or Seven Dust
There are several products, such as Bifen IT or Seven Dust, that you can dilute with water and spray around your yard and house yourself. This is a cheaper option than an exterminator so if cost is an issue it is definitely the best bet if you need to get rid of the flies at low cost.
The easiest way for a fly to enter your house is through windows and doors. There are many types of electronic insect traps or zappers that you can purchase and place near windows and doors that will attract the flies with light and kill them before they ever make it into your house.
Diatomaceous Earth is a natural, organic pesticide. It may be harder to find in local stores but it can easily be purchased online. It kills by physical action not dangerous chemicals that can be hazardous to children and pets so there is no harm to people or the environment. It has tiny sharp diatoms that scratch off the insects outer coating, causing it to dehydrate and therefore killing it.
At any length regardless of how you deal with the insects keep a vacuum handy as they will fall dead in droves, hence the name cluster flies. Take care to remove the dead insects to avoid germ and disease spread. Vacuuming will also help get rid of any eggs that could potentially hatch later causing the problem to restart all over again.