Spider Mite Predators (Amblyseius andersoni) x 100 - Broad-Spectrum Mite Control
Best for: Growers who want a preventative, chemical-free defence against spider mites and other plant mites across a larger grow space, applied before an infestation takes hold.
Our thoughts
Andersoni is the generalist of the predatory mite world - it'll happily sit tight on pollen and leaf debris waiting for trouble, rather than needing pests already present to survive. That makes it a solid preventative choice rather than a last-minute rescue. Get sachets out before you see webbing, not after.
Amblyseius andersoni is a predatory mite used throughout professional horticulture as a biological control against a range of plant-feeding mites, including the two-spotted spider mite (Tetranychus urticae). This pack contains 100 mini sachets, each fitted with a hook for hanging directly on the plant or crop structure.
Each sachet holds a breeding colony that releases predatory mites gradually over several weeks, rather than dumping the whole population on the plant in one go. Andersoni is notably tolerant of a wide temperature range and can survive on pollen and fungal spores when prey mites aren't around, which is what makes it useful as an early or preventative release rather than only a reactive one.
How it compares
Andersoni sits at the generalist end of the predatory mite range, next to more specialist options.
- Broader target range than Amblyseius californicus, which focuses tightly on two-spotted spider mite - andersoni also has activity against broad mite, russet mite, and some thrips
- More cold-tolerant than most other phytoseiid mites used in UK grow rooms, so it copes better with cooler tent temperatures
- Sachet-and-hook format is the same delivery method used by other biological control suppliers such as Koppert and Dragonfli, so it fits standard IPM routines without extra kit
A good all-rounder pick if you want broader protection rather than a single-pest specialist.
Usage guidance
When to release
Hang sachets before you see visible mite damage or webbing - andersoni performs best as a preventative release since it can sustain itself without prey already present.
Placement
Hang sachets on stems or supports at roughly one sachet per plant for smaller plants, spacing them evenly through larger canopies so mites disperse across the whole crop.
Environment
Avoid direct exposure to strong sunlight or drying airflow on the sachet itself, and don't spray pesticides in the same area once predators are released.
Timing
Mites continue emerging from each sachet for several weeks, so a single release covers an extended period rather than needing daily top-ups.
Technical specifications
- Species: Amblyseius andersoni
- Pack size: 100 mini sachets
- Delivery format: Sachet with hanging hook
- Targets: Two-spotted spider mite and other plant-feeding mites, with activity against broad mite and russet mite
- Release duration: Gradual emergence over several weeks per sachet
- Survives without prey on: Pollen and fungal spores
- Vendor: Bioline
Who this is for
- Growers covering a larger number of plants who want a bulk pack rather than buying single sachets
- Anyone running a preventative IPM programme rather than waiting for visible pest damage
- Growers in cooler tents or grow rooms where a more temperature-tolerant predator is useful
Best suited to whole-crop preventative use rather than spot-treating one or two affected plants.
Our take
This is a proper preventative tool rather than a fire extinguisher - get it out early and it'll quietly keep mite populations down before they become a problem worth worrying about. The pack of 100 makes sense once you're covering more than a handful of plants.
Does exactly what it should, day in, day out, as long as it goes out before the mites do.
