How To Get Rid Of Flies & Fungus Gnats On Houseplants

Flies and fungus gnats are common pests that can infest houseplants and cause a range of problems, such as stunted growth, yellowing leaves, and root rot. If left untreated, these pests can kill your plants and spread to other plants in your home.

In this guide, we will explore some effective ways to get rid of flies and fungus gnats on houseplants.

  1. Identify the problem. Before you can get rid of flies and fungus gnats on your houseplants, you need to confirm that they are the problem. Flies are small, winged insects that are typically black or grey in color. Fungus gnats are also small, winged insects, but they have long, thin legs and are often mistaken for mosquitoes. If you see small flies or fungus gnats buzzing around your plants, or if you notice yellowing leaves or stunted growth, you may have a problem with these pests.
  2. Remove infected plants. Once you have identified the problem, the next step is to remove any infected plants from your home. This will help to prevent the pests from spreading to other plants in your home. Be sure to dispose of the infected plants in a sealed bag to prevent the pests from escaping.
  3. Clean your pots and tools. After removing infected plants, be sure to clean your pots and tools thoroughly. Use a solution of water and dish soap to scrub the pots and tools, and be sure to rinse them well to remove any leftover soap. This will help to remove any eggs or larvae that may be present, and prevent the pests from re-infesting your plants.
  4. Repot your plants. If your plants are infested with flies or fungus gnats, it is a good idea to repot them using fresh, sterile potting soil. This will help to remove any eggs or larvae that may be present in the old soil, and provide your plants with a fresh start. Be sure to use a well-draining soil mix, as this will help to prevent root rot, which can be a problem for plants infested with fungus gnats.
  5. Use sticky traps. Sticky traps are an effective way to control flies and fungus gnats on houseplants. These traps are coated with a sticky substance that traps the pests, preventing them from flying around and causing problems. Place the traps near your plants, and be sure to replace them when they become full or covered with dirt.
  6. Use insecticides. If you are unable to control the problem with the steps above, you may need to use insecticides. There are many different insecticides available, including neem oil, pyrethrin, and insecticidal soap.
  7. Keep your plants well-watered. Flies and fungus gnats are attracted to moist, damp soil, so it is important to keep your plants well-watered. Water your plants regularly, but be sure to allow the soil to dry out between waterings. This will help to prevent the pests from laying their eggs in the soil.
  8. Keep your plants healthy. Healthy plants are less likely to be attacked by flies and fungus gnats. Be sure to provide your plants with the right amount of light, water, and nutrients, and check them regularly for signs of pests or disease.
  9. Use a soil drench. A soil drench is a solution that is applied to the soil around your plants. Some soil drenches contain pesticides that can kill flies and fungus gnats. Be sure to follow the instructions on the product label, and only use a soil drench as a last resort, as it can be harmful to your plants and the environment.
  10. Use a natural deterrent. Some plants have natural deterrents that can help to keep flies and fungus gnats away. For example, mint and basil plants can repel flies and fungus gnats. Consider planting these herbs near your houseplants to keep the pests away.
  11. Check new plants before bringing them home. If you are buying new plants, be sure to check them carefully for signs of flies and fungus gnats before bringing them home. Look for small flies or fungus gnats flying around the plant, and check the soil for any eggs or larvae. If you notice any signs of infestation, choose a different plant.

    Overall, the key to getting rid of flies and fungus gnats on houseplants is to take preventive measures and act quickly if you notice a problem. By following the steps outlined above, you can help to keep your plants healthy and free of these pesky pests.

About the author 


Plant-lover with a life-goal to buy land across the UK to plant his own forest, James specialises in horticulture and botanical research, and has been growing and rewilding forests with trees, including endangered species, for over 15 years. He is an avid gardener, allotment owner, and aids in the running of a carbon neutral initiative in companies across the UK.

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