Sciarid Larvae (Fungus Gnat Larvae)
Soil-dwelling larvae feeding on roots, algae and organic matter in propagation media.
Sciarid larvae are the immature stages of fungus gnats. They feed on algae, fungi and fine roots in propagation media and container compost. High populations damage young plants, causing damping-off, root pruning and poor establishment. Biological control uses Steinernema feltiae, Dalotia coriaria and Hypoaspis (Stratiolaelaps) predators, alongside careful water and algae management.
Biological Controls for Sciarid Larvae (Fungus Gnat Larvae)
The species below are examples of beneficial organisms commonly used against sciarid larvae (fungus gnat larvae). Recommendations are based on published biological control information and practical IPM experience. Always confirm suitability for your crop, growing system and local conditions before use.
Steinernema feltiae
Environment: glasshouse
Temperature Range: 10.0 – 28.0°C
Rate: 250k–500k nematodes/m²
Frequency: Repeat every 2–4 weeks
Focuses on larval stages; integrate with Hypoline for best result.
Atheta coriaria
Environment: all
Temperature Range: 10.0 – 30.0°C
Rate: 10–50/m²
Frequency: introduce early; top up as needed
Soil predator layer supporting sciarid larval suppression; use alongside nematodes and good hygiene.
Further BioWiki Reading
For more background on pest biology, beneficial insects and environmental factors, use the BioWiki alongside this practical control guide.
Related Biological Solutions
Growers dealing with sciarid larvae (fungus gnat larvae) often also monitor these pests as part of a complete IPM programme: