Fruit flies can invade your home through any small crack or opening. They have good smellers and can smell fruit and other desirable foods from long distances. They seek warm and moist areas that have organic matter in which they can lay their eggs. They will take advantage of any damaged fruit skin and can also be found around kitchen sinks, garbage, and drains. The best combat against fruit flies is to remove food sources in the home for them which include food waste, dirty counters and dishes, clogged drains, etc.