Alabama High Performance Computing (HPC) Practice Exam 2026 - Free HPC Practice Questions and Study Guide

The most effective action to mitigate cluster fly infestations is sealing all cracks in the structure. Cluster flies often enter homes looking for a warm place to overwinter, and they can do so through even the smallest gaps in walls, windows, and doors. By sealing these openings, it reduces the potential entry points for these flies, thereby decreasing the likelihood of an infestation.

This preventative measure is crucial because once cluster flies enter a home, they can reproduce and create larger problems. Proper sealing also has the added benefit of improving energy efficiency by preventing drafts, making it a practical as well as a pest-control measure.

Other actions like using regular household cleaners or introducing window screens can be helpful, but they do not address the root issue of entry points. While keeping indoor lights off at night might reduce the attraction of flies to an interior space, it does not prevent them from entering in the first place.