Diatomaceous earth, composed of fossilized algae, possesses microscopic sharp edges that penetrate the exoskeletons of pests, leading to their dehydration and demise. Its effectiveness against fungus gnats is rooted in this action, making it a viable eco-friendly pest control solution. The fine powder can be dusted around plants, targeting the gnats’ breeding grounds, and its low toxicity renders it safe for use near humans and pets when handled with proper precautions.