The answer to 'natural fumigation repellent' is to use natural essential oils and plant-based repellents to deter pests without harsh chemicals. Some effective options include peppermint oil, lemongrass oil, citronella, and diatomaceous earth. These can be applied around the perimeter of your home, in cracks and crevices, or diffused in the air to create a natural barrier against insects and rodents.
When using natural repellents, be sure to reapply every 2-4 weeks as the effects wear off over time. You can also combine multiple repellents for added effectiveness. However, natural methods may not be as strong as professional-grade fumigation, so you may need to call in an exterminator for severe infestations.