Onion Thrips (Thrips tabaci)
Thrips species attacking onions, leeks and salads, causing silver streaks and reduced yield.
Onion thrips (Thrips tabaci) attack leeks, onions, salad crops and ornamentals. Feeding causes pale streaks, silvering and corky patches on leaves and bulbs. Damage reduces photosynthesis and can make crops unmarketable. Biological control includes predatory mites such as Amblyseius swirskii and ground-dwelling predators in the crop environment, combined with reflective mulches and weed management.
Biological Controls for Onion Thrips (Thrips tabaci)
The species below are examples of beneficial organisms commonly used against onion thrips (thrips tabaci). 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.
Amblyseius cucumeris
Environment: glasshouse
Temperature Range: 18.0 – 32.0°C
Rate: 50–100 mites/m²
Frequency: Monthly top-ups while risk remains
Useful in protected onions, leeks and alliums; combine with Exhibitline Sf drench where pupation occurs in soil.
Orius majusculus
Environment: all
Temperature Range: 15.0 – 30.0°C
Rate: 0.5–2/m²
Frequency: introduce early; top up as needed
Leaf-active Orius predator suited to vegetative thrips pressure such as onion crops. Establish early and integrate with predatory mites where appropriate.
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 onion thrips (thrips tabaci) often also monitor these pests as part of a complete IPM programme: