Neoseiulus fallacis – Prevention and Management of Spider Mites


Use fallacis more for control. Although they will attack spider mites and eggs, they can also stay alive by feeding on other things. Slighly less aggressive than persimilis.


Both persimilis and fallacis are shipped as live adults. We ship them once a week usually on Wednesday and they must be shipped overnight to make sure they get to you as live adults!  So even though you are paying for overnight shipping – no matter when you order – your spider mite predators will usually arrive on Thursday!

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What are fallacis?

Neoseiulus  fallacis are known as the the all-purpose predatory mite as not only do they attack spider mites and their eggs, but also can feed on pollen to keep alive to watch out for any wayward mites.fallacis are better than persimilis in surviving a wider range of conditions but not quite as aggressive.  Mites that have to worry about fallacis  include
-the two-spotted mite (Tetranychus urticae)
-the carmine red mite (T. cinnabarinus)
-a two-spotted mite relative (T. evansi)
-the European red mite (Panonychus ulmi)
-the citrus red mite (P. citri)
-the southern red mite (Oligonychus ilicis)
-the six-spotted mite (Eotetranychus sexmaculatus)
-the Pacific mite (T. pacificus)
and more…

How they live.

About the size of a period in this sentence, these clear-white to clear-pink adult female mites lay eggs (up to 100) right in the middle of spider mite concentrations and their webbing if present.  Hatching eggs turn into nymphal forms which also feed on spider mite eggs and young spider mites.Immature predators grow about 8 days before their change into adults. The adults live about a month.

Best environment.

Fallacis will perform best in temps  70-100°F with a relative humidity of between 40-90%. Lower or higher temps hamper reproduction and movement. They can feed in as low as 35 degrees and up to 100 degrees! They can live off pollen alone if need be while they wait for spider mites to make a run for your plants! They can also overwinter and be ready for the spring!

How to find them.

How do you know they are working? You probably will not see them without a magnifying glass, but look for new growth on previously infected plants.  If you look closely you might see them scurrying across the underside of the leaves looking for prey!

Additional information


2000 Adults, 5000 Adults


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