Onions repel aphids, carrot rust flies, and flea beetles.Click to see full answer. Just so, do onions repel insects?According to the University of Florida, there is no proof that eating onions, or any other foods, such as garlic or bananas, will repel mosquitoes from you. While onion and other allium species do have insect repellent properties, onion plants or sprays made from sliced onion will not effectively repel mosquitoes.Secondly, what smells do bugs hate? Repels moths, fleas, flies and mosquitoes. Lavender has been used for centuries to add a pleasantly sweet fragrance to homes and clothes drawers. Although people love the smell of lavender, mosquitoes, flies and other unwanted insects hate it. People also ask, what pests do onions repel? Onions repel ants, aphids, flea beetles, carrot flies and mosquitoes.What herbs repel insects? 11 Garden Plants to Help Keep Bugs Away! Marigolds. The scent of a marigold will deter plant lice, mosquitoes, and even rabbits. Chrysanthemums. This might be the best plant to deter bugs. Mint. Mint plants can repel spiders, ants, and mosquitoes. Basil. Repel mosquitoes and houseflies with this wonderful herb. Citronella grass. Lavender. Chives. Petunias.