Often when we consider accidental insect invaders in the home, we are thinking about those insects that are going into survival mode to pass the winter. This is the case in the fall with cluster flies, stink bugs, lady beetles, and boxelder bug. They enter structures in the fall and are now trying to get out to resume their field activity. But there are others that can wander indoors during the spring and summer. This would include ants, ground beetles, and millipedes (not an insect, but close enough!). So for this reason, keeping unwanted pests out of the home is a year-round activity.
Preventing Insect Pests from Entering Homes
There are three primary strategies to keep these pests from entering the home. These are: (1) modifying the habitat around the home, (2) exclusion, and (3) insecticide barriers. While none of these is a sure-fire solution to the problem, a combination can greatly reduce unwanted invaders.
(1) Habitat Modification around the Home
Ideally, the area immediately outside the home should be made less favorable to these pests. Practices, such as pulling back mulch 18 inches away from the foundation, creates a dry area around the home. Directing water from rain gutters and air conditioners away from the foundation, as well as fixing leaky faucets, is beneficial as well. Clip back limbs from shrubs and trees that touch the house or roof as these can be a bridge for ants and others invaders. You can attempt to reduce outdoor pest populations by eliminating their outdoor hiding places, such as clutter around buildings or even firewood near the foundation.
(2) Exclusion
Exclusion techniques to prevent entry include caulking gaps and cracks in the foundation and siding, as well as repairing windows and screens. Door sweeps and a well-sealed garage door can help with millipedes and ground beetles attempting to walk into homes. In spite of the best efforts, some persistent individuals will find a way inside. For further information, refer to How to Pest-Proof/Winter-Proof Your Home (EntFact-641).
(3) Insecticide Barrier Sprays
As a last resort it may be worthwhile to treat hiding places, the foundation, and building perimeter with an appropriately labeled insecticide. Large numbers of insects may accumulate on sunny south or west walls of houses and buildings where they may be sprayed directly with an appropriately labeled insecticide before they have a chance to enter.
Dealing with Insects Inside the Home
The safest and most effective control for unwanted insects already inside is manual removal, then discard. Use a vacuum to collect and discard as many invaders as possible. Fortunately, these invaders do not reproduce indoors, so numbers do not increase.
By Ric Bessin, Entomology Extension Specialist
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Kentucky Pest News 