Amblyseius swirskii

$65.00 USD

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Size X-Small — Up to 5 Six-Inch Plants — 500 Mites Small — Up to 10 Six-Inch Plants — 1,000 Mites Medium — Up to 25 Six-Inch Plants — 2,500 Mites Large — Up to 50 Six-Inch Plants — 5,000 Mites X-Large — Up to 100 Six-Inch Plants — 10,000 Mites 2X-Large — Up to 150 Six-Inch Plants — 15,000 Mites 3X-Large — Up to 200 Six-Inch Plants — 20,000 Mites 4X-Large — Up to 250 Six-Inch Plants — 25,000 Mites

Amblyseius swirskii is one of the most versatile predatory mites available to the modern grower. It is a high-metabolism generalist that doesn't just wait for pests—it actively hunts them down. While other mites specialize in one specific bug, Swirskii is a multi-threat predator that works on thrips, whiteflies and small mites at the same time. The bottle puts a large number of mites into the canopy at once, which is what you want when thrips are already there — this is the format for a problem you can see. One thing worth understanding about how it gets you there: swirskii takes thrips at the first larval stage, and second instars fight it off. So it works on the generation coming up behind the one in front of you, and the count falls gradually rather than overnight. Warm and humid is where this species pulls ahead of the alternatives — a grow tent is close to its ideal conditions, which is why it is the sensible answer there rather than the expensive one. Whitefly is a different case: get swirskii in ahead of it. The published trials that worked were all preventive releases, and the one that dropped mites onto established whitefly hot-spots did not shift them.

Field Notes

Amblyseius swirskii

Bottle

The beneficial

Species

Amblyseius swirskii

What it eats

Hunts

Thrips larvae, particularly first instar. Whitefly eggs and young nymphs

Also eats

Pollen. Sustains the population between prey and after the infestation clears

Eats opportunistically

Spider mites, broad mites, other small soft-bodied mites. Taken on encounter, not sought out

Won't touch

Adult thrips, adult whitefly, aphids, mealybugs, scale, fungus gnats, anything below the soil line

What arrives

Format

Bottle — loose mites in vermiculite carrier

Role

Treatment — an immediate dose onto an active infestation

Sold by

Count

Ships as

Mixed-stage population with food mites and vermiculite carrier

Where it works

Upper canopy and new growth. It's a foliar mite — it won't go into the soil

Optimal temp

70–90°F. One of the more heat-tolerant phytoseiids

Humidity

60% RH and up. Below that, egg hatch drops off

Establishes

Yes, given warmth and pollen or prey

Running it

Deploy

Immediately on arrival. Loose mites can't be held

Application

Sprinkle directly onto foliage, concentrating on new growth and infested leaves. Rotate the bottle gently before and during application to keep mites distributed through the carrier

Reapply

Every 7–14 days while the infestation is active

Refrigerate

Compatible with

Californicus, persimilis, Stratiolaelaps scimitus, beneficial nematodes, lacewings, ladybugs, Aphidius, Cryptolaemus, Diglyphus

Keep separate from

Nothing in the catalog. Swirskii does eat cucumeris juveniles — in a lab choice test it took them in preference to thrips — but that was an arena with nowhere to go, and no one has ever run the two together on a crop and measured what happens. Release them together if you want the coverage. Just don't buy the pair as insurance: in a mixture, expect swirskii to end up the one doing the work

Chemical interval

One day after neem oil or insecticidal soap. Never with sulfur, at any dilution

Safe around

Pets, children, plants

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Country/region

Amblyseius swirskii

Amblyseius swirskii

Amblyseius swirskii