Amblyseius swirskii

Athias-Henriot, 1962

Swirski mite

Amblyseius swirskii is a predatory mite in the Phytoseiidae, originally described from almond trees in Israel in 1962. It has become one of the most widely used agents globally, commercially available and released in more than 50 countries. The is a feeding on whiteflies, thrips, spider mites, broad mites, and other small pests of vegetable and ornamental crops. It can also survive and reproduce on non-prey food sources including pollen, nectar, and plant secretions, which enhances its establishment when prey are scarce.

Amblyseius swirskii bearing Beauveria bassiana conidia by Lin, G., Guertin, C., Di Paolo, SA. et al.. Used under a CC BY 4.0 license.

Neoseiulus cucumeris and Amblyseius swirskii bearing Beauveria bassiana conidia by Lin, G., Guertin, C., Di Paolo, SA. et al.. Used under a CC BY 4.0 license.

Neoseiulus cucumeris bearing Beauveria bassiana conidia by Lin, G., Guertin, C., Di Paolo, SA. et al.. Used under a CC BY 4.0 license.

Pronunciation

How to pronounce Amblyseius swirskii: /æmˈblaɪsiəs ˈswɪrskiːaɪ/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Identification

A. swirskii is distinguished from similar phytoseiid mites by its feeding habits and ability to thrive on pollen. It shows preference for glabrous (smooth) leaves and plant structures with domatia—small shelters where are frequently laid. are typically found on flowers and leaf domatia of plants. The is morphologically similar to other Amblyseius species but is identified in commercial contexts by its origin and performance characteristics.

Images

Habitat

Greenhouses, screenhouses, and open field agricultural systems; prefers crops with glabrous leaves or those offering domatia (small plant cavities). Cannot establish on tomato crops due to detrimental acyl sugars produced by glandular trichomes. Found on ornamental plants, vegetable crops, and almond trees in Mediterranean and subtropical climates.

Distribution

Originally described from Israel; now established globally with commercial releases in more than 50 countries across Europe, Asia, Africa, and the Americas. Established reported in many countries' crops.

Seasonality

Active year-round in protected ; activity and rates increase with temperature from 25°C to 35°C. Optimal performance at higher temperatures and humidity levels with water availability.

Diet

feeding on whiteflies (Aleyrodidae), thrips (Thysanoptera), spider mites (Tetranychidae), russet mites, gall mites, broad mites, false spider mites, and first-instar lepidopteran larvae. Can subsist and reproduce on non-prey foods including pollen (especially Typha spp., pepper), nectar, plant secretions, honeydew, and fungal pycnial fluid.

Life Cycle

Development from to occurs in 5.56–9.37 days for females at 25–35°C; egg stage fails to hatch below 33% relative humidity. Female longevity ranges 20.64–29.39 days at 25–35°C. Oviposition period lasts 13.94–19.77 days with total of 31.91–42.16 eggs per female. Net reproductive rate (R₀) ranges 21.68–29.52; (rₘ) ranges 0.181–0.248 across temperatures. stages more sensitive to water availability than adults; female development more sensitive than male development.

Behavior

Exhibits early learning in foraging contexts: attack prey experienced during development more quickly than novel prey. Shows preference for laying in domatia. Disperses within crop systems to locate prey. Can survive starvation periods by utilizing pollen and other non-prey resources.

Ecological Role

Key agent in programs; functions as a suppressing multiple pest simultaneously. Pollen feeding allows persistence during pest-free periods, facilitating early-season establishment. Serves as a model organism for studying learning costs in predators.

Human Relevance

Third-most researched predatory mite globally after Phytoseiulus persimilis and Neoseiulus californicus. Widely commercialized for in greenhouses and open fields. with pollen-rich (sweet alyssum, buckwheat, ornamental peppers) enhances field performance. Susceptible to many , particularly abamectin, milbemectin, and cyflumetofen; requires careful timing of chemical applications (minimum 5–7 days after release). Reduced-risk pesticides such as potassium salts of are compatible when applied correctly.

Similar Taxa

Neoseiulus cucumerisAlso used for of thrips and whiteflies; A. swirskii has higher and faster growth rates at equivalent temperatures.
Amblydromalus limonicusAnother phytoseiid used in biocontrol; differs in and prey preferences.
Phytoseiulus persimilis spider mite ; A. swirskii is a with broader diet and ability to use pollen.