Sciarid Fly (Bradysia impatiens)
Common fungus gnat species in propagation and pot crops.
Bradysia impatiens is one of the main fungus gnat species found in propagation and container production. Adults resemble small black flies; larvae live in moist compost, feeding on algae, fungi and fine roots. High populations damage seedlings and cuttings. Biological control uses Steinernema feltiae, Dalotia coriaria and Stratiolaelaps scimitus, alongside water management and reduction of algae.
Biological Controls for Sciarid Fly (Bradysia impatiens)
The species below are examples of beneficial organisms commonly used against sciarid fly (bradysia impatiens). 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.
Hypoaspis miles + Atheta coriaria
Environment: glasshouse
Temperature Range: 10.0 – 28.0°C
Rate: Hypoline 50–100 mites/m²; Staphyline 0.5–1 beetles/m²
Frequency: Top up according to monitoring
Combined predation from soil mites and rove beetles gives strong suppression.
Stratiolaelaps scimitus (Hypoaspis miles)
Environment: all
Temperature Range: 12.0 – 30.0°C
Rate: 50–100/m²
Frequency: introduce early; top up as needed
Soil predatory mite for sciarid fly management; best as an early predator layer alongside hygiene/algae control and compatible nematode programmes.
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 fly (bradysia impatiens) often also monitor these pests as part of a complete IPM programme: