What are the main reasons for pest invasions in homes?

The main reasons for pest invasions in homes are primarily linked to the availability of food, water, and harborage, which are essential resources for pests. Pests invade homes seeking these vital elements for survival and reproduction. Food sources can include human and pet food, crumbs, and organic waste. Water is crucial for their hydration and can be found in various places, such as sinks, bathrooms, and leaks. Harborage refers to safe and sheltered spots where pests can reside, breed, and stay hidden from predators, which can include cracks in walls, cluttered areas, and behind appliances.

This understanding emphasizes the importance of maintaining cleanliness and proper sanitation in homes to minimize the availability of these resources, hence reducing the likelihood of pest infestations. Each of the other options addresses factors that either indirectly contribute to pest presence or refer to control methods rather than the fundamental reasons for pest invasions.