Amblyseius fallacis

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Key Features

Amblyseius fallacis is a native predatory mite with a broad host range. It is an effective predator of many spider mite species, such as the two-spotted and european red mite, Tarsonemid mites like broad and cyclamen mites, as well as eriophyoid mites, such as the hemp russet mite. Fallacis is adaptable to a variety of environmental conditions, and is capable of overwintering in the field when given the proper conditions. For these reasons, it is a commonly used predatory species in orchards and hop fields.

These mites come packaged as adults - 1,000 and 2,000 count vials.

Primary Hosts:  Two-spotted spider mite, European red mite, spruce spider mite, southern red mite, bamboo mite

Secondary Hosts: Broad and cyclamen mite, hemp russet mite

How It Works

• Fallacis is most active in conditions with mild temperatures and high humidity. Crops with dense canopies encourage its development.

• While it is a very effective spider mite predator, fallacis, unlike persimilis, is unable to penetrate webbing and cannot feed on as many spider mites per day. For these reasons, fallacis is best used preventatively, or when spider mite populations are low.


• It is tolerant of cool temps, but performance and reproduction significantly increase as temperatures rise.

• In order to overwinter, fallacis requires shelter, which can even be leaves and plant debris left in a field.

• In the absence of prey, fallacis can sustain itself for a short period of time on plant pollen

Technical Notes

Activity range: 48˚F to 85˚F. Mites are active above and below these temps, but they cannot reproduce and their performance is compromised.

Optimum temperature: 80˚F
Optimum humidity: >50% RH

Diapause:  Fallacis populations undergo diapause when day length is below 14 hours. This can be averted if average temps are above 64˚F.