Root Aphid
Soil-dwelling aphids feeding on roots causing wilting, yellowing and poor nutrient uptake.
Root aphids (Pemphigus spp. and related genera) live on or near plant roots, often mistaken for fungus gnat larvae or root mealybugs. They disrupt nutrient and water uptake, causing wilting, stunting and pale foliage. Outbreaks increase under warm, moist conditions. Biological control includes entomopathogenic fungi (e.g., Beauveria), predatory rove beetles (Dalotia), and soil-dwelling nematodes such as Steinernema feltiae. Cultural hygiene and removal of contaminated compost are essential.
Biological Controls for Root Aphid
The species below are examples of beneficial organisms commonly used against root aphid. 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.
Aphidoletes aphidimyza
Environment: glasshouse
Temperature Range: 16.0 – 30.0°C
Rate: 1–2 adults/m² targeted to infested areas
Frequency: Repeat every 1–2 weeks
Can help where colonies extend above soil level; always combine with cultural and compatible chemical tools for root aphids.
Chrysoperla carnea
Environment: all
Temperature Range: 12.0 – 30.0°C
Rate: 5–10/m²
Frequency: repeat as needed
Support predator addition for hotspots; integrate with hygiene and monitoring (root aphid is rarely solved by one agent alone).
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 aphid often also monitor these pests as part of a complete IPM programme: