A comprehensive guide to every natural, organic, and biological pest control option available to homeowners. Organized by category with honest effectiveness ratings, safety information, and practical application advice. No hype, no dismissal - just what the science actually shows about natural pest control.
All common household and garden pests. Effectiveness varies dramatically by product and pest species - this guide tells you which natural options genuinely work and which ones are mostly marketing.
See individual product pages linked below for specific brand recommendations.
Natural does not automatically mean safe. Many natural pesticides can harm pets (essential oils and cats), beneficial insects (pyrethrins kill pollinators too), or aquatic life (rotenone is devastating to fish). Always read labels and follow directions regardless of whether a product is natural or synthetic.
What actually works (backed by strong science):
| Product | Best For | Effectiveness | Page |
|---|---|---|---|
| Bt (Bacillus thuringiensis) | Caterpillars, mosquito larvae | Excellent - equal to synthetics | Bt Guide |
| Spinosad | Ants, fleas, caterpillars, thrips | Excellent - professional grade | Spinosad Guide |
| Beneficial Nematodes | Grubs, flea larvae, fungus gnats | Excellent in proper conditions | Nematodes Guide |
| Diatomaceous Earth | Crawling insects (bed bugs, ants, roaches) | Good - slow but lasting | DE Guide |
| Neem Oil | Aphids, mites, fungal diseases | Good as preventive | Neem Guide |
| Insecticidal Soap | Soft-bodied insects (aphids, whiteflies) | Good - contact kill only | Soap Guide |
| Iron Phosphate | Slugs and snails | Excellent - equal to metaldehyde | Iron Phosphate |
| Oil of Lemon Eucalyptus | Mosquito/tick repellent | Good - CDC recommended | OLE Guide |
| Cedar Oil | Fleas, moths, ticks | Moderate - good for fleas | Cedar Guide |
| Milky Spore | Japanese beetle grubs | Excellent - 15-20 year control | Milky Spore |
| Metarhizium fungus | Ticks, grubs | Good - emerging technology | Metarhizium |
| Bacillus subtilis | Plant diseases (fungicide) | Good as preventive | B. subtilis |
What works moderately (use with realistic expectations):
Essential oils (peppermint, clove, rosemary) provide genuine repellent and contact-kill effects but evaporate quickly and cannot eliminate infestations. Citronella candles reduce mosquito landings by about 40-50%. Capsaicin repels mammals but needs constant reapplication. Geraniol is one of the better natural mosquito repellents. See individual guides: Peppermint | Clove/Eugenol | Citronella | Geraniol | Rosemary | Lemongrass | Capsaicin
What does NOT work for infestations:
Ultrasonic devices (zero scientific evidence), dryer sheets (no peer-reviewed support), bay leaves for pantry pests (mild at best), coffee grounds for slugs (minimal effect), banana peels for aphids (myth), Irish Spring soap for deer (extremely temporary). These are internet folklore, not pest control.