Bulb Mites (Rhizoglyphus spp.)
Soil and bulb-dwelling mites feeding on bulb tissue, roots and basal plates.
Bulb mites (Rhizoglyphus and related genera) attack lilies, alliums, ornamentals and stored bulbs. They feed on damaged or weakened tissue but can rapidly spread and predispose bulbs to rot. Infested bulbs show poor emergence, stunting and rotting basal plates. Biological control includes soil predatory mites such as Stratiolaelaps (Hypoaspis) and entomopathogenic fungi, combined with strict hygiene, discarding heavily infested stock and avoiding prolonged damp storage.
Biological Controls for Bulb Mites (Rhizoglyphus spp.)
The species below are examples of beneficial organisms commonly used against bulb mites (rhizoglyphus spp.). 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.
Stratiolaelaps scimitus
Environment: all
Temperature Range: 12.0 – 30.0°C
Rate: 50–100/m²
Frequency: at start, then repeat as needed
Primary control for bulb mites in substrate. Apply early; works best with moderate moisture and good hygiene.
Amblyseius andersoni
Environment: glasshouse
Temperature Range: 15.0 – 28.0°C
Rate: 25–50 mites/m² over affected bulbs/containers
Frequency: Top up monthly while bulbs at risk
Secondary/support only: primarily a foliar generalist predatory mite. Not a reliable soil control for bulb mites; use alongside Stratiolaelaps and 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 bulb mites (rhizoglyphus spp.) often also monitor these pests as part of a complete IPM programme: