What scares away hornets?

What scares away hornets includes visual deterrents, strong smells, natural predators, and methods that make area less attractive, though no method provides complete protection and prevention plus professional removal for nests is best. Hornets are scared away by fake hornet nests, as they are territorial and may avoid areas where they think another colony exists, so hanging decoy nests made of paper or brown bags in eaves and trees may deter new colonies, though evidence is mixed and not always effective. They are scared by strong smells like peppermint oil, eucalyptus oil, citronella, and clove oil that can be sprayed around windows and outdoor seating, though oils evaporate quickly requiring reapplication. Natural predators like birds, dragonflies, and praying mantises scare hornets, as they prey on them, and presence of these predators may reduce hornet activity. Loud noises and vibrations can scare hornets temporarily, but they return. Most effective scare is removing attractants that draw hornets, keep food and sweet drinks covered outdoors, seal trash cans, clean up overripe fruits, and avoid wearing bright floral clothing and strong perfumes. Keeping outdoor lights off at night reduces insects that are hornet prey. For nests near home, professional pest control removal scares away colony permanently, as DIY removal is dangerous due to aggressive defense. So fake nests, strong smells, and removing food sources help scare away hornets, but prevention is key.