How to Choose and Use Mosquito Repellent Correctly
DEET, picaridin, IR3535, and oil of lemon eucalyptus all work — but each has specific use cases, concentrations, and limitations. Here's how to choose the right one.
📋 Steps
1
DEET — the gold standard for most situations
DEET (20-30%) provides 4-6 hours protection against mosquitoes, ticks, gnats, and biting flies. Safe for adults and children over 2 months (use 10-30% for children). Apply to exposed skin and clothing — not under clothing. DEET can damage some plastics and synthetic fabrics — avoid watch bands, sunglasses frames, and synthetic clothing.
2
Picaridin — the DEET alternative with no downsides
Picaridin 20% is equal to DEET in efficacy against mosquitoes and ticks, has no odor, doesn't damage plastics or synthetics, and is generally considered more pleasant to apply. Available as spray and lotion. Growing preference among outdoor professionals. Excellent first choice if DEET feel or odor is a concern.
3
IR3535 — good for families seeking alternatives
IR3535 (Avon Skin-So-Soft, Sawyer products) provides good mosquito protection with lower toxicity profile than DEET. Effective for 2-4 hours. Not as effective against ticks as DEET or picaridin. Appropriate for mild mosquito pressure and family use.
4
Oil of Lemon Eucalyptus (OLE/PMD) — the natural option with data
OLE or its active ingredient PMD is the only plant-based repellent with strong scientific evidence of efficacy. NOT the same as lemon eucalyptus essential oil — must be a product labeled as OLE. Not for children under 3. 4+ hours protection against mosquitoes. Less effective against ticks than DEET.
5
Apply permethrin to clothing separately
Permethrin applied to clothing (not skin) provides a separate protection layer that kills ticks and mosquitoes that land on fabric. Lasts 6 washes. The combination of skin repellent + permethrin-treated clothing provides the highest available personal protection. Particularly important for tick prevention.
💡 Tips
No repellent prevents 100% of bites — reapply after swimming or heavy sweating regardless of labeled duration
Sunscreen applied before repellent reduces repellent effectiveness — apply repellent over dry sunscreen, not under it
Citronella candles, ultrasonic devices, and vitamin B supplements have poor evidence of effectiveness against mosquitoes — save your money for proven options
For children: apply repellent to your own hands first, then apply to the child to avoid eyes and mouth contact
Active infestations or when DIY has already failed
Ongoing service contract
$400–$800/yr
Prevention and long-term peace of mind
Costs vary by region, property size, and severity. Get at least two quotes before hiring.
✅ How to Know It's Working
Pest control success is measured in weeks, not days. Here's what to look for:
Week 1–2: You may see increased activity as pests are flushed from hiding. This is normal.
Week 2–4: Activity should drop noticeably. Bait traps or sticky monitors should show declining counts.
Week 4–6: New activity near zero. Any resurgence means a population was missed or re-introduction occurred.
💡 Monitoring tip: Place sticky traps in corners and along walls before you start treatment. Counting catches weekly gives you objective data on whether the population is declining.
👷 When to Call a Professional
DIY is appropriate for small, contained infestations caught early. Call a licensed professional when:
You've tried DIY twice with no lasting improvement
The infestation involves a wall void, crawlspace, or area you can't safely access
There's a health risk involved (hantavirus, anaphylaxis risk, etc.)
The problem covers more than one room or a large outdoor area
You have children, elderly, or immunocompromised individuals in the household
⚠️ Rule of thumb: If you've spent more on DIY materials than a professional visit would cost, it's time to call.
❓ Frequently Asked Questions
How do I reduce mosquitoes in my yard?
Eliminate all standing water weekly. Apply Bti dunks to water features that cannot be drained. Treat the shaded perimeter under decks and along fence lines with bifenthrin spray every 30 days during mosquito season.
Do mosquito misting systems work?
Misting systems provide temporary relief but kill beneficial insects indiscriminately and mosquitoes from untreated areas continually reinvade. Source reduction plus targeted barrier spray on vegetation provides better long-term results.
Which mosquito repellent is most effective?
DEET (20-30%) provides 6-8 hours of protection. Picaridin (20%) provides comparable protection without the greasy feel. Oil of lemon eucalyptus provides 4-6 hours and is the most effective plant-derived option.
Do citronella candles repel mosquitoes?
Citronella candles reduce landings by only 40-50% within a very small radius of 3-5 feet. A portable fan (mosquitoes are weak fliers) combined with personal repellent provides significantly better protection.