Neoseiulus fallacis

Neoseiulus fallacis predatory mite


Neoseiulus (Amblyseius) fallacis is a native North America predatory mite, used to supress pest mites such as two-spotted spider mites, spruce spider mites, European red mites, cyclamen (or strawberry) mites and broad mites in fruit, ornamental and market garden crops.

Adults are pear-shaped, 0.5 mm long, with long legs. They can vary in colour from cream to orange-beige. The immature stages are generally a semi-transparent cream colour. The eggs are oval and 0.33 mm in diameter (double the size of a two-spotted spider mite egg).

Neoseiulus fallacis has excellent dispersal abilities and can withstand the cold and heat (active between 9 °C and 32 °C). This predatory mite can survive when pest populations drop to low levels. Fallacis is easily establishes itself throughout outside crops.

Neoseiulus fallacis can be used with the predatory mite Phytoseiulus persimilis and the predatory beetle Stethorus punctillum in a management strategy against spider mites.


This product can be purchased on our online store for producers under 2000 ft2 or residential. For a commercial purchase (2000 pi 2 and more), contact us.

Targeted crops

  • Cannabis
  • Small fruits (strawberries, raspberries, etc)
  • Fruit trees (orchard)
  • Ornamental plants
  • Market garden crops (cucumbers, tomatoes, peppers, etc.)
  • Hop
  • Soy

Targeted pests

  • Two-spotted spider mite (Tetranychus urtica)
  • Spruce spider mite (Oligonychus ununguis)
  • European red mite (Panonychus ulmi)
  • McDaniel spider mite (Tetranychus mcdanieli)
  • Broad mite (Polyphagotarsonemus latus)
  • Tomato Russet Mite (Aculops lycopersici)

Life cycle

  • Neoseiulus fallacis has a life cycle of 7 to 9 days at 21 °C, or 3 days at 32 °C.
  • Adults live from 14 to 62 days.
  • N. Fallacis is active from 9 °C to 32 °C and needs humidity levels over 50%.
  • Females lay 1-5 eggs per day, for a total of 26 to 60 eggs in their lifetime.
  • A female will consume 2 to 16 spider mites per day
  • Outside, adult females enter diapause when the days get shorter (less than 14 hours of light).
  • Neoseiulus fallacis will not enter into diapause in greenhouses when temperatures are kept over 18 °C.



  • AB0018 - Fallacis impact (Neoseiulus fallacis) on bean leaves - 1250 individuals at various stages of development
  • AB0019 - Fallacis impact (Neoseiulus fallacis) on bean leaves - 2500 individuals at various stages of development


  • AB001 - Fallacis impact (Neoseiulus fallacis) vermiculite - 500 adults
  • AB002 - Fallacis impact (Neoseiulus fallacis) vermiculite - 1000 adults

Introduction rate

Neoseiulus (Amblyseius) Fallacis
Introduction Quantity Surface Frequency Duration
Preventive in greenhouses 2 per m2 weekly or bi-weekly as needed
Curative light in greenhouses 5 per m2 weekly or bi-weekly as needed
Spider mites in field 2 per m2 once year
Broad mites in field 5 per m2 once year

Product data sheet(s)

Fiche signalitique
Neoseiulus fallacis on bean leaves

Fiche signalitique
Neoseiulus fallacis on vermiculite

Additional information

  1.   - Amblyseius (Neoseiulus) fallacis - Applied Bionomics Ltd.
  2.   - Fallacis, a most formidable predatory mite
  3.   - Neoseiulus (=Amblyseius) fallacis - Cornell University
  4.   - Predatory Mite, Amblyseius fallacis (Garman) - Mid-Atlantic Orchard Monitoring Guide
  5.   - Neoseiulus californicus (McGregor) and Neoseiulus fallacis (Garman): larval responsesto prey and humidity, nymphal feeding drive and nymphal predation on phytoseiid eggs
  6.   - Amblyseius (Neoseiulus) fallacis - technical sheet by Applied Bionomics Ltd.

Targeted pest

Targeted production

Recent news

Did you know


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