Updated: October 14, 2022

Gnats are small, flying insects that are commonly found on plants. They can be a nuisance to gardeners, especially when they infest cucumber plants. Gnats feed on plant roots and can cause damage to the plant if left untreated. Fortunately, there are several ways to get rid of gnats in cucumber plants.

Identifying Gnats

Before you can get rid of gnats, it’s important to know what they look like. Gnats are small, usually less than 1/8 inch in length. They have long antennae and two wings. Gnats are often mistaken for fruit flies, but they are different insects. Fruit flies have red eyes and a rounder body shape, while gnats have black eyes and a more slender body.

Causes of Gnat Infestation

Gnats are attracted to moist environments and organic matter. This makes cucumber plants a prime target for infestation. Overwatering the soil, using infected soil or compost, and having decaying plant matter in the garden can all attract gnats to your cucumber plants.

How to Get Rid of Gnats

1. Remove Infected Plants

The first step in getting rid of gnats is to remove any infected plants from your garden. This will prevent the gnats from spreading to other plants in your garden.

2. Allow Soil to Dry Out

Gnats thrive in moist environments, so allowing the soil to dry out can help get rid of them. Water your cucumber plants only when the soil is dry to the touch.

3. Use Yellow Sticky Traps

Yellow sticky traps are an effective way of trapping gnats. The bright color attracts the gnats, and the sticky surface traps them. Place these traps around your cucumber plants to catch any flying gnats.

4. Use Neem Oil

Neem oil is a natural insecticide that can be used to get rid of gnats in cucumber plants. Mix 1 tablespoon of neem oil with 1 quart of water and spray the solution on the soil around your cucumber plants. This will kill any larvae in the soil and prevent adults from laying eggs.

5. Use Beneficial Nematodes

Beneficial nematodes are microscopic worms that feed on the larvae of gnats. They can be purchased online and added to the soil around your cucumber plants. These nematodes will help control the gnat population in your garden.


Are gnats harmful to cucumber plants?

Yes, gnats can be harmful to cucumber plants. They feed on plant roots and can cause damage if left untreated.

Can I use pesticides to get rid of gnats?

Yes, pesticides can be effective in getting rid of gnats. However, it’s important to use a pesticide that is safe for use on edible plants.

How do I prevent gnats from infesting my cucumber plants?

To prevent gnats from infesting your cucumber plants, avoid overwatering the soil, use clean soil or compost, and remove any decaying plant matter from the garden.