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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.

According to the Centers for Disease Control and Prevention (CDC), fleas can carry human disease-causing pathogens for Plague, Flea-borne typhus, and Cat scratch disease. These diseases are caused by fleas such as Oropsylla montana, Xenopsylla cheopis, and Ctenocephalides felis, and are commonly found in rural areas of the western United States, California, Texas, and Hawaii. Fleaborne parasites like tapeworms can also be spread to people and animals if they accidentally swallow an infected flea, and small children are at a higher risk. Symptoms may not be present in most infected people.

When you spray a roach, the chemicals, usually a mix of neurotoxins like pyrethroids or pyrethrins, start affecting its nervous system almost immediately. It disrupts the roach’s nerve signals, causing paralysis and eventually death. You'll often see the roach twitch, flip over on its back, and stop moving within seconds to minutes.

The easiest way to tell what kind of wasp you have is to identify its size, markings, color, and the type of nest it builds. These factors can help differentiate one type of wasp from another, since there are hundreds of thousands of different species. If you need help identifying the wasp type, consult a local pest control professional.