No-see-ums are weak fliers, sensitive to certain plant-based compounds, and small enough to slip through standard window screens. Those three facts are your best starting points for controlling them naturally. A combination of physical barriers, airflow, and plant-derived repellents can dramatically reduce bites without reaching for chemical sprays.
Use Fans to Exploit Their Weak Flight
No-see-ums (also called biting midges, sand flies, or sand gnats depending on where you live) are poor fliers whose flight is greatly reduced or stopped entirely in windy conditions, according to Purdue University’s entomology department. This makes a simple fan one of the most effective and overlooked tools against them.
On a porch or patio, a box fan or oscillating pedestal fan pointed at seating height creates a zone these insects simply can’t penetrate. Ceiling fans work too, though they’re less targeted. Indoors, even a small desk fan near an open window can keep no-see-ums from settling on you. The breeze doesn’t need to be strong. Because these insects weigh almost nothing, a gentle, steady airflow is enough to push them off course. Position fans to blow across your body rather than away from you, so the moving air acts as a barrier between you and the bugs.
Install No-See-Um Mesh Screens
Standard window and door screens have gaps large enough for no-see-ums to walk right through. If you’re finding bites indoors, your screens are almost certainly the problem. Replacing them with a tightly woven 20×20 mesh, often sold specifically as “no-see-um screening,” blocks most of these tiny insects along with gnats and sand flies. Phifer is one widely available manufacturer, and most hardware stores carry equivalent products.
The tradeoff is reduced airflow and slightly less visibility compared to standard screens, so many people install them only on windows they open most often or on screened porches in marshy and coastal areas where no-see-ums are worst. If you’re in an RV or camper, aftermarket no-see-um screen kits are available for most door and window sizes. For a temporary fix, fine mesh netting (sometimes called bridal veil netting) can be draped over windows or bed frames.
Plant-Based Repellents That Work
Oil of lemon eucalyptus is the most studied natural repellent and the only plant-derived option recommended by the CDC for biting insects. Its active compound, PMD, has been tested against mosquitoes and shown to provide protection similar to low-concentration DEET products, though its effectiveness drops off faster and requires more frequent reapplication. Commercial products containing 8 to 10 percent PMD specifically list no-see-ums on their labels, which means they’ve been tested and approved for that use by the EPA.
Other essential oils with some repellent effect include citronella, lemongrass, lavender, and eucalyptus. These can be applied diluted in a carrier oil (like coconut or jojoba) to exposed skin, or burned in candles and diffusers to create a less hospitable zone around outdoor seating areas. The practical limitation of all plant-based repellents is duration. Where a DEET product might last several hours, most essential oil formulas need reapplication every 30 to 90 minutes, especially if you’re sweating.
Coconut oil on its own is worth mentioning. Some people find that a thin layer on exposed skin creates a physical barrier that makes it harder for no-see-ums to bite, while also serving as a carrier for other repellent oils. Mixing a few drops of lemon eucalyptus oil into coconut oil gives you both effects in one application.
Reduce Breeding Habitat Around Your Yard
No-see-ums breed in moist organic matter: wet soil, decaying leaves, the edges of ponds, and anywhere water meets decomposing plant material. You won’t eliminate them entirely (they can fly in from neighboring properties), but reducing breeding sites on your own land makes a noticeable difference over a few weeks as local populations shrink.
Start with standing water. Empty plant saucers, birdbaths, clogged gutters, and low spots in the yard that hold water after rain are all potential nurseries. Birdbaths you want to keep should be flushed and refilled every two to three days to interrupt the breeding cycle. Compost piles and thick layers of mulch near the house can also harbor larvae, so pull mulch back a few inches from your foundation and turn compost regularly to dry it out. Trimming vegetation around seating areas improves airflow at ground level, which both dries the soil and creates the breezy conditions no-see-ums avoid.
Time Your Outdoor Activity
No-see-ums are most active during dawn and dusk, particularly in humid, still conditions. If you have flexibility in when you’re outside, shifting yard work or evening relaxation by even an hour can cut your exposure significantly. They’re also more active on overcast, calm days than on bright, breezy ones. On peak days, combining multiple strategies (a fan, repellent, and long sleeves) is more effective than relying on any single approach.
Light-colored clothing helps because no-see-ums are attracted to dark colors and the heat they absorb. Loose-fitting, tightly woven long sleeves and pants are the simplest physical barrier, though on hot summer evenings that’s not always practical, which is where fans and repellents pick up the slack.
Natural Remedies for Bites You Already Have
No-see-um bites tend to itch more intensely than mosquito bites relative to their size, and the welts can last several days. A few kitchen-shelf remedies help manage the itch and swelling without medication.
- Cold compress: A cold, damp cloth or ice pack applied for 5 to 10 minutes numbs the skin and reduces inflammation. The American Academy of Dermatology recommends this as a first step for insect bite itch.
- Baking soda paste: Mix one tablespoon of baking soda with just enough water to form a paste. Apply it to the bite for 10 minutes, then rinse. The CDC recommends this approach for bug bite relief.
- Oatmeal paste: Equal parts oatmeal and water, applied to the bite for 10 minutes. Oatmeal contains compounds with natural anti-irritant properties that calm itching and swelling.
- Aloe vera gel: Fresh gel from a cut aloe leaf reduces pain and inflammation. Let it dry on the bite and reapply as needed.
- Witch hazel: Available at most pharmacies, witch hazel contains tannins that reduce inflammation, soothe burning, and can speed healing when dabbed on bites.
- Honey: A small drop of honey on an itchy bite can reduce inflammation thanks to its antibacterial and anti-inflammatory properties.
Avoid scratching, even though no-see-um bites make that difficult. Broken skin from scratching can lead to secondary infection, which is the main complication from these bites. If a bite becomes increasingly red, warm, or swollen over several days rather than improving, that’s a sign of infection rather than a normal reaction.