Categories: Kitchens

How to Prevent and Get Rid of Gnats Inside Your House

Published by
James marcus

Fruit flies aren’t the only type of gnats that can invade your home. You may find fungus gnats and drain flies, too. Unfortunately, each type has a different appearance and a unique way to get rid of them. If you’re curious about how to get rid of gnats, the first step is to identify which type is in your space. Luckily, we spoke with pest control experts and the pros at the Good Housekeeping Institute to learn about killing these winged creatures for good. This includes using kitchen ingredients, like baking soda and vinegar, along with a few recommended (and inexpensive!) store-bought traps. Plus, we share some of the best preventative measures to stop gnats from coming back. One of the most shocking gnat-attractors in your home? Your plants!

What is a gnat?

Gnats are tiny flying insects that are often found in swarms and are known for their ability to hover in place. Three of the most common types of gnats present in homes are fungus gnats, fruit flies and drain flies. You’ll first need to get up close and personal to identify which gnats you’re dealing with in order to best understand how to solve the problem.

The good news is that while some species of gnats can bite and sting, the types most commonly found indoors are simply just a nuisance to humans, flying in your face during meal prep or during a dinner party. “In a recent study, we found that most of the ‘flying insects’ in homes are fungus gnats,” says Dr. Changlu Wang, who works in the Department of Entomology at Rutgers University. He adds that fungus gnats “do not bite people or cause allergic reactions.”

While gnats are unlikely to go away on their own, they can be managed with a bit of vigilance and some basic home remedies.

How to Prevent Gnats

Generally speaking, gnats — along with many other pests — thrive in moist, humid environments, so you may want to consider running a dehumidifier in particularly dank areas of your home. “In damp basements, keep relative humidity below 50% and make sure bathrooms are well ventilated,” says Dan DiClerico, the Good Housekeeping Institute’s Home Improvement and Outdoor Lab director. “Just keep in mind that a dehumidifier won’t cure the underlying source of the humidity.” You’ll also want to fix any leaking pipes and make sure your home’s gutters and downspouts are channeling water away from the foundation walls to keep moisture out.

Beyond that, the easiest way to prevent infestations in your home is by eliminating the insects’ “food” source, which varies depending on the type of gnat:

✔️ Fungus gnats are usually found near houseplants. “Fungus gnat infestations are often caused by sources of damp soil, such as houseplants, or decaying or damaged plant roots,” says Dr. Jim Fredericks, a board-certified entomologist and senior vice president of public affairs at the National Pest Management Association (NPMA). To prevent fungus gnats, it’s important to regularly repot your houseplants in new soil and ease up on overwatering them.

✔️ Fruit flies feast on decaying fruits and vegetables. To prevent fruit flies in your home, rinse and dry your produce as soon as you get home from the store, then keep them inside bins or in your fridge as much as possible. “By washing them and storing them properly, fruit flies can’t find that food source anymore,” says Chelle Hartzer, an entomologist with Orkin. Fruits that ripen quickly — like apples, grapes, melons, pears, peaches and plums — can be kept in a low-humidity crisper drawer; produce that is prone to wilting, including leafy greens, carrots and broccoli, belong in the high-humidity crisper drawer. While bananas are best left on the countertop, ideally on a dedicated banana hanger, you can transfer them to the fridge once ripe, or peel and store them in the freezer in an airtight container.

✔️ Drain flies prefer bacteria, sewage and gunk. This means you’ll usually find in kitchen and bathroom drains, garbage disposals, and seldom-used toilets. To prevent drain flies, it’s important to clear and clean those plumbing lines frequently, especially during hot, humid summer weather.

  • To clean the drains, pour in a solution of equal parts baking soda and vinegar, wait five minutes, then follow with boiling water. Stubborn clogs might require a harsher treatment; Hartzer advises using a drain cleaner like Drano Max Gel Clog Remover to flush out the pipes. If the problem persists, an ongoing infestation may indicate a leak, so call a plumber.
  • To clean garbage disposals, toss a dozen ice cubes in the chamber, plus 1 tablespoon of baking soda, a few lemon slices and 1 teaspoon of bleach. Turn the disposal on without running water until you hear the grinding stop. Then, with the motor running, flush it with cold water for 30 seconds.

How to Get Rid of Gnats Quickly

While preventive measures will stop gnats at the source, sometimes it’s best to take immediate action. Here are the most effective ways to get rid of gnats, instantly.

1. Use a high-tech bug zapper.

We’ve found that plug-in traps can be extremely effective. Consider the Zevo Flying Insect Trap, a GH Seal holder that uses safe amounts of blue and UV light to attract gnats, fruit flies and mosquitoes. “I personally love the Zevo traps that have earned our Seal; I have them in my house all year round,” says Birnur Aral, Ph.D., director of the Good Housekeeping Institute’s Health, Beauty and Sustainability Lab. “The newest version of the traps now emit less light overall but provide the same proven efficacy we came to expect from the Zevo brand.”

2. Try a spray solution.

TheZevo Fly, Gnat & Fruit Fly Flying Insect Spray, another GH Seal holder, is also a good option. It uses geraniol and lemongrass oil, which are bio-insecticides that don’t need to be registered with the EPA, to kill gnats on contact. Though safe around people and pets, the spray must be handled properly. Zevo cautions against it coming into contact with eyes or skin, and the flammable liquid should never be used near electrical wiring.

3. Make a DIY vinegar trap.

One of the best and easiest methods is to set up a vinegar trap. There are a few ways to do this:

  • Make a trap with apple cider vinegar and plastic wrap: DIY your own fruit fly trap by pouring a little apple cider vinegar into a glass or just removing the cap from the bottle. Cover the opening with plastic wrap and secure it with a rubber band. Then, poke a few small holes in the plastic. The fruit flies will enter but will not be able to make their way out.
  • Make a trap with a paper cone, vinegar and old fruit: Place a little vinegar and a chunk of very ripe fruit in a jar. Then, roll printer paper into a cone and stick it into the jar, placing the narrow opening down. The smell of rotting produce will help entice the fruit flies into the mixture, but the paper cone will make it difficult for them to escape.
  • Leave out a bowl of vinegar and dish soap: Add three drops of dish soap to a bowl of vinegar, and leave it uncovered in the problem areas. The soap cuts the surface tension of the vinegar, so the flies that are enticed by the vinegar will sink and drown.

4. Put out a beer or wine trap.

Along with vinegar, fruit flies also like the smell of wine. Leave out an almost-empty open bottle of old wine — the skinny neck will keep the flies trapped. The Old Farmer’s Almanac also recommends using stale beer to attract fruit flies.

5. Buy a sticky trap.

For a fail-safe trap, buy Aunt Fannie’s FlyPunch on Amazon. The mixture includes sodium lauryl sulfate (a surfactant used in soaps) and malic acid (found in fruit). Just open the top, set it on your counter and watch the cycle of life unfold. Sticky paper or cards are other efficient solutions, especially since gnats are attracted to bright colors, like yellow.

6. Make a candle trap.

Position a tall candle into a candlestick, before placing it in a small pan filled with water. Put your pan on the counter, add a bit of dish soap to the water and light the candle before turning the lights off. Since the gnats are attracted to the flame, they’ll either hit the flame itself or fall into the water and drown. While the candle is lit, we recommend staying in the room to observe the flame until it’s time for it to be blown out.

7. Skip watering your plants.

Gnats thrive on the fungus of your plants, so it helps to let your plant babies dry out between waterings. Once the soil dries out, you’ll notice the death of not only the fungus, but the gnat larvae and eggs too. If the gnats keep appearing, experts at Colonial Pest Control Inc., recommend applying an indoor-friendly pesticide as a soil drench to soak and kill the gnats and fungus.

8. Pour boiling water down the drain.

Drains are a drain gnat’s safe haven. Even without baking soda, vinegar and drain cleaner, you can pour boiling hot water into the sink to kill their eggs. This will also help get rid of any excess food and bacteria build-up.

Looking for more advice on managing pests? Check out our guides to the best mouse traps and how to get rid of silverfish.

This post was last modified on 10/10/2023 20:04

James marcus

Garden Courte is a blog written by [James Marcus], a passionate gardener and writer. She has been gardening for over 20 years and has a deep understanding of plants and how to care for them. In her blog, she shares her knowledge and experience with others, providing tips and advice on gardening, plant care, and more.

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James marcus

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