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Fortunately, many strong natural scents can help deter roaches, thanks to their keen sense of smell. Roaches tend to avoid potent aromas, such as crushed bay leaves, citrus peels, eucalyptus, and peppermint, as they associate these smells with danger. Sprinkling garlic powder, placing mint or lavender plants, or using essential oils like citronella, clove, or tea tree can create an unwelcoming environment for them. These scents don't kill roaches, but they can help keep them from settling in your home when used consistently in high-risk areas like kitchens, bathrooms, or entry points.

Citrus scents such as lemon or lime are lethal to bed bugs. They’re drawn to the smell, but the chemicals often kill them. There are other ways to kill bed bugs without an exterminator, including using steam, DIY heat treatments, essential oils, diatomaceous earth, and more. However, you should hire a professional bed bug exterminator to eliminate large numbers of bed bugs.

There are a few ways to keep pesky bugs away from your garden. One option you have is to plant flowers so beneficial insects like ladybugs can control pests for you. A similar method is companion planting, which means you’ll grow vegetables that’ll discourage pests, like garlic, onions, and basil. The best pest prevention method will depend on the bugs you have issues with and the plants in your garden. 

The term “gnat” is sometimes used as a blanket term to refer to both fruit flies and fungus gnats, as well as a variety of other tiny flying insects. However, the true one true “gnat” by name is the fungus gnat. While people may mistakenly lump both insects under the term "gnat," fungus gnats and fruit flies have different diets, habitats, and characteristics from each other, as well as the other small flying insects in the “gnat” category.