Amblyseius swirskii
10% off your first 4 orders, then 15% off every order after.
Heads up—this is just an estimate. We only ship when the bugs are happy and ready to travel (Mon–Thurs). If a colony needs a beat to peak, or we're propagating a fresh batch, your order might hold up to a week. Treatment bottles jump the line when you've got an active infestation.
Amblyseius swirskii
At A Glance
Amblyseius swirskii is widely considered the most powerful and versatile predatory mite 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 consumes massive amounts of Thrips, Whiteflies, and microscopic mites. The bottle format is designed for "Total Canopy Saturation," providing an immediate presence of thousands of hunters.
-
Scientific Name: Amblyseius swirskii
-
Primary Target: Thrips (Larvae), Whiteflies (Eggs/Larvae), and Broad/Russet Mites.
-
Secondary Targets: Spider Mites, Tarsonemid mites, and Apple Rust Mites.
-
Key Advantage: Aggressive appetite. A single Swirskii can consume up to 10 pest larvae or eggs per day, leading to a rapid population crash of the target pest.
Target Pests
Environmental Needs
Selection Guide
How to Use
How They're Shipped
Deploy day, and the weeks after.
How to deploy your order, and how to read the results over the next few weeks.
-
01
Open the box right away
Bring the package indoors as soon as it arrives. Don't leave it on a hot porch, in a cold mailbox, or in direct sun. If you can't deploy immediately, set the bottle somewhere room-temperature (60–75°F) and out of direct light — it'll keep for a day or two.
-
02
Let the bottle rest 15 minutes
Mites huddle in transit for warmth. Set the bottle somewhere room-temperature for fifteen minutes before you open it — this lets them spread back through the carrier and warm up before deployment.
-
03
You probably won't see them
Predatory mites are smaller than a grain of salt — most people can't spot them with the naked eye, and phone cameras can't focus close enough to catch them. That's expected. What you can check: the carrier material should look dry and uniform, the bottle should be intact, and there shouldn't be any sour smell or visible mold.
-
04
Deploy the same day
Apply in the evening or on a cloudy day to avoid UV exposure. For pests on the plant — spider mites, thrips, broad mites — sprinkle the carrier material directly onto leaves and stems where damage is visible. For soil-dwelling pests like fungus gnats, sprinkle onto the top inch of soil and lightly water afterward to help the mites settle into the medium. Either way, spread across plants instead of piling in one spot. See the product description for species-specific dosing.
-
05
Watch your plants over 1–2 weeks
The real "are they working" check isn't visual — it's whether your pest population drops. Bottled treatments typically show measurable reduction in spider mites, thrips, or other targets within one to two weeks. If pest pressure isn't easing by then, that's when to email us.
Something visibly wrong on arrival?
Crushed packaging, sour smell, mold, or a soaked carrier — take a photo and email info@fgmnnursery.com within 24 hours of delivery with your order number. We'll replace or refund without question.
Read the full Live Delivery Guarantee →Join Karen's Live Shows — Pests, Plants & Predators on PalmStreet.
Every Friday at 7pm EST — plus additional shows throughout the week. Ask your pest questions in real time — we answer everything.
The Weekly Newsletter
A weekly excuse to be weird about bugs at parties.
Weekly dispatches on the quietly alarming things happening in your soil. All of it real.
No spam. Leave whenever.
You're in
The first strange true thing arrives next week.
FAQ
What is your Live Delivery Guarantee?
We guarantee that your beneficial insects will arrive healthy and ready to work. Because we are shipping live organisms, we use packaging and expedited shipping to ensure their safety. In the rare event that your order is compromised during transit, please take a photo of the package and contact us within 24 hours of delivery so we can make it right.
Why is Swirskii more expensive than other mites?
Will they eat my plants?
Can I use them with Neem Oil?
Do they work on Root Aphids?
How long do they stay on the plant?
Is it safe for my pets?
Help! I'm overwhelmed
Yeah, it's a lot the first time you're using predatory mites. Please email us at info@fgmnnursery.com and we'll be happy to help!
I don’t see anything moving in my bottle or sachet. Does that mean they’re dead?
Not at all! In fact, go ahead and deploy them.
Predatory mites are microscopic (often less than 0.5mm) and naturally blend into their carrier medium (bran or vermiculite).
- For Bottles: The mites often huddle in the center of the bottle for insulation during transit.
- For Sachets: These are "slow-release" nurseries. The mites stay tucked deep inside the breeding media and emerge one by one over 2–4 weeks. Seeing an "empty-looking" sachet or bottle is not proof of a loss; it is simply how they are packaged for maximum survival.
Mite Matters
Cucumeris: Why It Works (and Why It Fails)
Cucumeris is reliable, widely researched, and genuinely effective — within a specific set of conditions. Here's what it actually does, what it won't do, and how to tell if it's the right species for your situation.
My Plant Has Webbing. Help.
Webbing on a plant isn't always spider mites — and the mite that causes the most damage indoors doesn't produce webbing at all. Here's how to tell what you're actually looking at before you treat.
Native vs Invasive Ladybugs
Most ladybugs you'll encounter are red with black dots — and that description fits native, introduced, and invasive species equally. Here's how to actually tell them apart, what the harlequin ladybug has been doing to native populations, and where the real ecological concerns are.