My problem came after the upstairs neighbor (I lived at the time in a basement apartment), whose responsibility it was to maintain the yard, let the grass grow to about 15" high. The adult bugs live on flowers, I believe, so keeping the grass trimmed and vegetation away from the house should lower the risk of getting them inside and looking for places to lay their eggs.
I never really had a problem, or any real idea that there could be a problem, with bugs until that spring. Then, while cleaning out the house to deal with the bugs I discovered mold all over my leather and had to discard pretty much every leather thing I owned, and then the septic tank failed and I was told I had to move out of my apartment, and then I injured my arm at work, and then I got in a car accident.....exciting year, all told.