Fungus gnat nematodes are microscopic organisms used to control fungus gnat larvae in compost and potting soil. They target larvae in the root zone, helping reduce flying gnats and limiting root damage caused by larvae in damp growing media.
Suitable for indoor plant owners, greenhouse growers and anyone managing houseplants, seedlings or container plants affected by fungus gnats. Also see our slow release nematodes.
Fungus gnat nematodes for larvae in compost and potting soil
Steinernema feltiae are watered into moist compost where they move through the growing media to find fungus gnat larvae. They help interrupt the breeding cycle in the soil, which reduces new adult flies appearing around plants.
Indoor plant fungus gnat control for pots and seed trays
Use these nematodes on houseplants, propagation trays, planters and greenhouse crops where damp compost attracts tiny black flies. They are well suited to indoor pots and enclosed growing spaces where fungus gnats often return.
How to apply fungus gnat nematodes to houseplant soil
Mix the pack contents with water and apply evenly over moist soil or compost. For best results, treat the top layer where larvae are most active and keep the growing media moist after application.
When to use fungus gnat nematodes for indoor and outdoor containers
Use indoors throughout the year when fungus gnats are present. For greenhouse crops and outdoor containers, apply during warmer months when compost stays moist and larval activity is higher.
Fungus gnat nematodes for herbs, vegetable plants and fruit in pots
Suitable for edible crops grown in containers, including herbs, vegetable plants and fruit. They can also be used around pets and people, making them a good choice for indoor growing areas and family spaces.
Benefits
- Targets fungus gnat larvae in compost and potting soil
- Helps reduce adult gnats by interrupting the breeding cycle
- Suitable for houseplants, seed trays, greenhouse crops and containers
- Can be used on edible plants grown in pots
- Applied with water to moist compost or soil
Specifications
- Contains: Steinernema feltiae
- Coverage: up to 12m²
- Application: mix with water and apply to moist compost or soil
- Suitable for: indoor pots, planters, seed trays, raised containers and greenhouse use
- Storage: keep refrigerated
- Shelf life: approx 2 weeks
- Sizes: 12m² pack
Frequently asked questions
Can fungus gnat nematodes be used in self watering pots?
Yes, but apply them from the top onto moist compost so they reach the upper soil layer where larvae are usually found. Keep the compost lightly moist after use.
Are fungus gnat nematodes suitable for young seedlings?
Yes, they can be used in seed trays and around young plants where fungus gnat larvae may feed on fine roots and affect early growth.
Should I use sticky traps with fungus gnat nematodes?
Yes, sticky traps can help catch adult gnats above the soil while the nematodes target larvae below the surface. This helps reduce the full lifecycle.
What conditions help fungus gnat nematodes work well?
Moist compost, moderate temperatures and avoiding dry soil after application will help movement through the growing media and improve contact with larvae.
How often should fungus gnat nematodes be reapplied to indoor plants?
Repeat use every few weeks if fungus gnats continue to appear, especially in warm rooms, greenhouses or growing areas where compost stays damp.
