Where Are Black Flies Coming from?

Also known as buffalo gnats and several other common names, black flies are true flies found in areas with cool-water rivers and streams. Unlike mosquitoes, which lay eggs near stagnant water, black flies prefer running water. The larvae develop attached to submerged rocks and wood.

Where are the black flies in my house coming from?

You may see cluster flies in your home when the weather gets warm although sometimes they appear in winter. That's because they get inside and lay eggs, which then hatch when the house warms up. If the heater kicks on during the winter months, the eggs will also hatch.

Why do I suddenly have black flies in my house?

Those flies may appear when a small animal such as a mouse, rat, squirrel or bird dies within a wall, ceiling or floor void. You may or may not detect an odor. Such flies will find the hidden carcass and lay eggs on it. The eggs will hatch into larvae (maggots) which feed on the carcass.