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Most lady bug infestations are actually caused by Asian lady beetles, an exotic pest that was imported at the beginning of the 20th century.  Two very common misconceptions are that lady bugs and lady beetles are actually the same insect, and that both are a pest.  The opposite is true for both of these statements.  Lady bugs and lady beetles are not a pest, and can actually be very beneficial if you have a garden, as the insects eat aphids.
Though you will likely never get rid of lady bugs or beetles completely, there are a few steps you can take to control their invasion of the interior of your home.  Sealing screen doors, window screens, and porches is a great place to start.  One of the most common ways for a lady bug or beetle to enter a home is through these areas.  Consider replacing weather stripping (or adding it if you don’t already have some installed), as this is one of the most cost effective ways to seal these areas. If a problem lies in torn or damaged screening, window screening is actually very affordable as well, should you choose to make the repair yourself.
Sealing door frames, window frames, and siding are also important steps to take to protect your home from an invasion of lady bugs.  Any entrance into your home should be sealed and covered to prevent an infestation from occurring inside your home.
Exclusion is the key!