Root Mealybug

Hidden soil-dwelling mealybugs feeding on roots and crowns of ornamentals and container crops.

Root mealybugs (Rhizoecus spp., Phenacoccus subterraneus) live below the soil surface on roots and stem bases. Infestations cause stunting, yellowing, wilting and reduced nutrient uptake. They spread through contaminated pots, compost and plant material. Biological control includes entomopathogenic nematodes, predatory soil mites such as Stratiolaelaps scimitus, and drenches with Beauveria bassiana. Maintaining good hygiene and avoiding over-wet compost reduces pressure.

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Biological Controls for Root Mealybug

The species below are examples of beneficial organisms commonly used against root mealybug. 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: all

Temperature Range: 12.0 – 30.0°C

Rate: 0.5–1 million/m² (via drench)

Frequency: repeat at 7–14 day intervals as needed

Soil drench targeting root-zone stages; keep substrate moist for several days post-application. Combine with hygiene and hotspot management.

Cryptolaemus montrouzieri

Environment: all

Temperature Range: 18.0 – 30.0°C

Rate: 2–10 beetles/m² depending on infestation level

Frequency: introduce early; repeat during pressure

Predatory beetle for mealybug hotspots; performs best in warmer crops. Pair with nematode drenches for a layered programme.

Anagyrus pseudococci

Environment: all

Temperature Range: 18.0 – 30.0°C

Rate: 1–2/m²

Frequency: introduce early; repeat at intervals during pressure

Parasitoid targeting exposed mealybug stages; use alongside soil drenches (Sf) and Cryptoline for integrated control.

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 root mealybug often also monitor these pests as part of a complete IPM programme: