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How to Get Rid of Gnats in Colocasia Plant

Updated: December 27, 2022

Gnats can be a nuisance when they infest your colocasia plant. These small, flying insects can quickly multiply and cause damage to your plant if left unattended. Fortunately, there are several ways to get rid of gnats in colocasia plants.

Identify the Source of the Infestation

The first step in getting rid of gnats is to identify the source of the infestation. Gnats are attracted to moist soil, decaying organic matter, and overwatered plants. Check the soil for any signs of mold or fungus, which can be a breeding ground for gnats. Also, make sure that your plant is not overwatered as this can create a favorable environment for gnats.

Use Sticky Traps

One way to get rid of gnats is to use sticky traps. Sticky traps are simple and effective tools that can help capture and kill flying insects. You can purchase sticky traps at any garden supply store or make your own by applying a layer of petroleum jelly on a yellow index card. Place the trap near the plant and replace it every few days.

Use Insecticidal Soap

Insecticidal soap is a natural and safe way to get rid of gnats in colocasia plants. It works by suffocating the insects and disrupting their cell membranes. Mix one tablespoon of insecticidal soap with one quart of water and spray the solution on the plant’s leaves and stems. Repeat this process every 7-10 days until the gnats are gone.

Use Beneficial Nematodes

Beneficial nematodes are microscopic worms that can help control gnat populations in soil. These nematodes feed on insect larvae, including gnat larvae, and can effectively reduce their numbers. You can purchase beneficial nematodes online or at garden supply stores.

Allow Soil to Dry Out

Gnats thrive in moist soil, so allowing the soil to dry out can help reduce their numbers. Avoid overwatering your plant and consider using a well-draining soil mix. You can also aerate the soil by gently loosening it with a fork to improve drainage.

Clean Up Dead Leaves and Debris

Dead leaves and debris can provide a breeding ground for gnats. Remove any dead leaves or debris from the plant’s soil and dispose of them properly. This will help reduce the number of gnats in your plant.


Gnats can be a frustrating problem for colocasia plant owners, but they can be controlled with the right methods. Identifying the source of the infestation, using sticky traps, insecticidal soap, beneficial nematodes, allowing soil to dry out, and cleaning up dead leaves and debris are all effective ways to get rid of gnats in colocasia plants.


Are gnats harmful to colocasia plants?

Yes, gnats can be harmful to colocasia plants as they feed on the plant’s roots and can cause damage if left unattended.

Can I use vinegar to get rid of gnats in my colocasia plant?

While vinegar can kill gnats, it is not recommended for use on plants as it can also harm beneficial bacteria in the soil.

How often should I water my colocasia plant?

Colocasia plants prefer moist soil, but overwatering can create a favorable environment for gnats. Water your plant when the top inch of soil feels dry to the touch.