Mosquitoes, black flies, ticks, and no-see-ums are more than just annoying in the wilderness. They can transmit diseases like Lyme, West Nile virus, and malaria depending on where you are. They also cause welts, itching, and sleep deprivation that drain your energy and morale in a survival situation. When you do not have a bottle of DEET in your pack, the plants growing around you and the campfire you are building can provide real protection.
People have been repelling insects with natural materials for thousands of years.
These methods are not as long-lasting or potent as commercial repellents, but they work well enough to make a meaningful difference when applied correctly and reapplied frequently.
Smoke: The Oldest Insect Repellent
Sitting near a campfire is the simplest way to keep biting insects at bay. Smoke confuses the carbon dioxide sensors that mosquitoes and flies use to find you. But not all smoke is equally effective.
Smoky Fire Technique
Build a small fire and let it burn down to coals.
Then add green leaves, damp grass, or slightly rotten wood on top. These materials smolder rather than burn, producing thick smoke. Position yourself in the smoke drift. It is not pleasant, but mosquitoes hate it more than you do.
Smudge Pot
A smudge pot is a portable version of a smoky fire. Fill a tin can, coconut shell, or clay pot with glowing coals from your fire. Add green leaves or damp punk wood on top.
Place the smudge pot near where you are sleeping or working. The slow, steady smoke provides a localized insect barrier.
Best Woods for Repellent Smoke
Not all wood smoke repels insects equally. Cedar, sage, and pine produce aromatic smoke that is particularly effective. If you are in an area with juniper, burning the green branches creates a thick, fragrant smoke that clears insects from a wide radius.
Avoid burning poison ivy, poison oak, or poison sumac since the smoke carries the irritating oils and can cause severe respiratory and skin reactions.
Plants That Repel Insects
Wild Mint and Peppermint
Mint grows wild throughout North America along stream banks and in moist meadows. Crush the leaves and rub them directly on your skin, focusing on exposed areas like your neck, wrists, ankles, and face. The menthol in mint is a proven mosquito deterrent. Reapply every 30 to 60 minutes as the oils evaporate.
Yarrow
Yarrow is a common wildflower with feathery leaves and flat-topped white flower clusters.
It grows in fields, roadsides, and clearings throughout temperate regions. Crush the leaves and flowers and rub the juice on your skin. Yarrow contains compounds that repel mosquitoes and also has antiseptic properties that can soothe existing bites.
Catnip
Wild catnip grows throughout much of North America and is surprisingly effective as an insect repellent. Research has shown that nepetalactone, the essential oil in catnip, repels mosquitoes more effectively than DEET in laboratory settings.
Crush the leaves and stems and rub the oils on your skin. It also works if you tuck fresh sprigs into your hat band, collar, and cuffs.
Lemon Balm
A relative of mint, lemon balm has a strong citrus scent that mosquitoes avoid. Crush the leaves to release the oils and apply to skin. It grows wild in many temperate areas and is easy to identify by its square stem and lemon fragrance when the leaves are crushed.
Pine Needles
If you are in a coniferous forest, you are surrounded by insect repellent.
Crush fresh pine needles to release the resinous oils and rub them on exposed skin. You can also boil pine needles in water to create a strong tea, let it cool, and apply it as a wash. The turpentine compounds in pine resin are effective against mosquitoes and black flies.
Mud and Ash Applications
Mud Coating
Covering your skin with a thin layer of mud creates a physical barrier that biting insects cannot penetrate.
It also masks your scent and body heat, making you harder for mosquitoes to locate. Apply mud to all exposed skin and let it dry. The dried mud continues to protect until it cracks and falls off. This is not glamorous, but it works, and indigenous peoples around the world have used this technique for millennia.
Ash Paste
Mix wood ash from your campfire with a small amount of water or animal fat to create a paste. Apply it to exposed skin. The alkaline properties of ash repel many insect species. Mixed with a bit of animal fat or plant oil, the paste stays on longer and provides both a physical barrier and a chemical deterrent.
Making a Repellent Oil
If you have a container and a fat source like rendered animal fat, olive oil from your food supplies, or coconut oil, you can make a longer-lasting repellent by infusing it with crushed repellent plants.
Method
Crush a large handful of mint, yarrow, catnip, or pine needles.
Place them in your container with enough oil or fat to cover them. If you can warm the mixture gently near the fire without bringing it to a boil, the heat helps extract the essential oils into the fat. Let it steep for at least an hour, then strain out the plant material. The infused oil can be rubbed on your skin and provides longer-lasting protection than crushed plants alone because the fat base slows evaporation of the active compounds.
Clothing and Camp Strategies
Natural repellents work best combined with physical protection.
Wear long sleeves and pants tucked into your socks. Pull your hood up or wrap a bandana around your neck. Sleep under mosquito netting if you have it, or inside a tightly closed shelter. Position your camp in breezy areas since even a light wind makes it difficult for mosquitoes to fly and land on you.
Avoid camping near standing water where mosquitoes breed. Move even 50 yards away from a pond or marshy area and the mosquito pressure drops significantly.
Final Thoughts
Natural insect repellent will not give you the same all-day, set-it-and-forget-it protection that a bottle of DEET provides.
You will need to reapply frequently, combine multiple methods, and accept that some bugs will still get through. But the difference between no protection and natural protection is enormous. A few hours of unrelenting mosquito attacks can wreck your sleep, your morale, and your ability to function. Rub some crushed mint on your skin, build a smoky fire, and fight back with what the woods provide.
