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The most effective natural roach repellent is Borax with its key ingredient of boric acid and diatomaceous earth. But some homeowners may not feel like these are “natural” enough, especially since you can’t use Borax around curious pets or toddlers.

On the other hand, studies have shown that oregano oil mixtures have some of the best repellent effects, and other research indicates that catnip oil, peppermint oil, and citrus oils have notable effects on keeping roaches away. Rosemary oil has been shown to be the most effective natural oil for killing cockroaches outright.

Fleas are not likely to go away on their own without intervention. This pest lives for around 100 days or up to one year as an adult, so long as it has access to a host. Female fleas lay up to 50 eggs per day, meaning these bugs can quickly spread in your home. Instead of waiting in hopes that they’ll go away on their own, you should hire an exterminator to prevent an infestation from worsening.

By sheer dollar amount, nothing equals a bad termite infestation that can ruin walls, floors, roofs and wooden support materials, requiring massive reconstruction after the pest problem has been taken care of. However, a bad rodent infestation can also cause a lot of damage, as can carpenter ants and bees that made hives within walls. 

A spider infestation happens when an unusually high and problematic presence of spiders occurs in a home to the point it becomes disruptive or poses a significant nuisance. If you notice an increase in spider sightings, numerous webs throughout the home, or see multiple spiders daily, it's likely you have an infestation. In cases where the types of spiders seen are venomous or medically significant species are present, the number of spiders is insignificant and would require pest control measures. On average, pest control costs between $300 to $550 for one-time service.