What is a natural bug repellent for plants?

Online Answer
According to NYBG, not only can they keep away mosquitoes, but they also dissuade aphids, thrips, whiteflies, Mexican bean beetles, squash bugs, and tomato hornworms. Known for its distinct smell, citronella grass (or lemon grass) is the most commonly used natural ingredient in mosquito repellants..
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Vinegar kills aphids by working as a natural contact pesticide that burns them to death. The solution contains acetic acid and water that when sprayed on an infested plant will help control the aphids.
The most commonly used non-chemical remedy is to spray them with soapy water. You can buy insecticidal soaps but many people make up their own using a teaspoon of washing up liquid diluted in 3 litres of water. The aphids are unable to breath under a coating of soap and subsequently suffocate..
Marigolds, known for being able to drive away all kinds of pests, have a scent that keeps aphids far away. Catnip, known for attracting cats, also has a way of repelling most other pests, aphids included. Some other fragrant herbs, such as fennel, dill, and cilantro are also known to deter aphids.
HOW TO GET RID OF APHIDS NATURALLY
  • Remove aphids by hand by spraying water or knocking them into a bucket of soapy water.
  • Control with natural or organic sprays like a soap-and-water mixture, neem oil, or essential oils.
  • Employ natural predators like ladybugs, green lacewings, and birds.
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    Actually, aphids are totally edible. Depending on the plants they've been eating, they can range from slightly bitter to sweet. They could cause problems for your friend's remaining produce, though.