Western Flower Thrips (Frankliniella occidentalis)
Major thrips pest of protected crops, causing silvering, bronzing and virus transmission.
Western flower thrips (Frankliniella occidentalis) is one of the most important thrips pests in protected crops. It attacks ornamentals, salads, peppers and many other hosts, causing silvering, bronzing, scarring and flower deformation. It is also an efficient vector of tospoviruses. Biological control relies on predatory mites such as Amblyseius swirskii and Transeius montdorensis, and predatory bugs Orius spp., supported by hygiene and sticky trap monitoring.
Biological Controls for Western Flower Thrips (Frankliniella occidentalis)
The species below are examples of beneficial organisms commonly used against western flower thrips (frankliniella occidentalis). 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 + Orius laevigatus
Environment: glasshouse
Temperature Range: 18.0 – 32.0°C
Rate: Amblyline 50–100 mites/m²; Oriline 0.5–2 bugs/m²
Frequency: Mites preventatively; Orius top-ups every 3–4 weeks
Standard biocontrol programme for WFT in many protected crops; support with sanitation and compatible chemistry.
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 western flower thrips (frankliniella occidentalis) often also monitor these pests as part of a complete IPM programme: