TL;DR:
No-see-ums—tiny biting midges—are hard to eliminate due to their size, moisture-loving habitats, and rapid life cycle. Effective control involves eliminating standing water, installing fine-mesh screens, using fans, and applying repellents like DEET or essential oils. In severe cases, CO₂ traps or professional treatments are needed.
What Are No-See-Ums and Why Are They So Hard to Get Rid Of?
What Exactly Are No-See-Ums?
No-see-ums, also called biting midges or sand flies, are tiny flies from the Ceratopogonidae family. These pests measure just 1–3 mm long, small enough to be nearly invisible. Only females bite, using their scissor-like mouthparts to feed on blood—essential for egg production.
Their bites are painful, itchy, and often leave welts that last for days.
Why Are They So Hard to Eliminate?
1. They’re Tiny
No-see-ums can slip through standard 16-mesh screens, making them hard to block from entering your home. Mosquito Magnet explains how small they really are.
2. Fast Breeders
These pests complete their life cycle in 2 to 6 weeks, quickly multiplying if left unchecked.
3. Moisture-Loving
They breed in damp soil, mud, clogged drains, and compost piles. These conditions are hard to fully eliminate, especially in humid environments.
Prevention and Control Tips
Remove Breeding Sites
Eliminate standing water in flower pots, birdbaths, and gutters. Regular yard maintenance is key.
Use Fine-Mesh Screens
Install 20-mesh or finer window and door screens to keep them out. Phifer offers helpful screening tips.
Set Up Outdoor Fans
No-see-ums are poor fliers. Running a ceiling or standing fan can disrupt their flight and keep them away from sitting areas. Mosquito Joe recommends fans as part of an integrated approach.
Apply Repellents
Use DEET, picaridin, or oil of lemon eucalyptus. Natural alternatives include citronella, peppermint, and eucalyptus oils.
Use CO₂ Traps
These traps mimic human breath, luring in the bugs before trapping or zapping them. For trap options, check Terminix’s guide.
Wear Protective Clothing
Long sleeves, pants, and bug netting provide physical barriers. Choose light colors and breathable fabrics when outdoors.
How to Treat Bites
- Clean the bite with soap and water.
- Apply a cold compress for swelling.
- Use hydrocortisone cream, antihistamines, or aloe vera to relieve itching.
Get more bite treatment advice from MosquitoNix.
When to Call a Pro
If you’re overwhelmed or live in a high-infestation area, professional pest control may be the best option. They can apply misting, fogging, or barrier sprays that specifically target no-see-ums.
Summary Table
| Control Method | Effectiveness |
| Remove water sources | Essential |
| Install fine mesh screens | High |
| Use outdoor fans | Moderate to High |
| Wear protective clothing | Moderate |
| Use repellents | High |
| CO₂ Traps | Moderate |
| Professional treatments | High |
No-see-ums may be small, but they’re persistent and painful pests. A combination of environmental management, personal protection, and, if needed, professional pest control can significantly reduce their presence and protect your peace of mind.
