Amblyseius Swirskii Slow-Release Prevention Sachets
10% off your first 4 orders, then 15% off every order after.
Bulk sachet discounts still apply to repeat orders — even if your cart doesn't show them.
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 Slow-Release Prevention Sachets
At A Glance
Preventative Control for Thrips & Broad Mites
The Heavy Hitter for Warm, Humid Grow Rooms.
If you’ve fought off thrips or broad mites before, you already know the drill: they are microscopic, sneaky, and nearly impossible to spot until the damage is done.
Amblyseius swirskii is the polyphagous (generalist) predator you want in your corner to make sure it doesn't get that far again. These slow-release sachets contain a breeding colony of mites that patrol your plants for up to 4 weeks, consuming the microscopic eggs and larvae of pests before they can grow into a visible problem.
How It Works: The voracious Generalist
A. swirskii is an aggressive predator that thrives in warm, humid environments. Unlike specialists that only eat one thing, swirskii has a wide appetite.
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Slow Release: Each sachet acts as a mini-nursery, releasing eggs, juveniles, and adults continuously over 2–4 weeks.
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Preventative Patrol: As they exit the sachet, they disperse across the canopy, hunting for soft-bodied prey in the earliest stages of development.
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Pollen Feeder: In the absence of pests, swirskii can survive on pollen or supplemental food (like our Good Bug Diet), making them excellent for pre-emptive release.
Targeted Pests
Amblyseius swirskii is famous for its ability to control multiple pest families simultaneously.
| Target Pest | Scientific Name | Targeted Stages |
| Thrips | Frankliniella spp. | Eggs and Larvae (L1/L2) |
| Whiteflies | Bemisia, Trialeurodes | Eggs and Larvae |
| Broad Mites | Polyphagotarsonemus latus | All life stages |
| Russet Mites | Aculops lycopersici | All life stages |
Ideal Conditions
Swirskii are tropical predators. They perform best when your environment mimics their natural habitat.
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Temperature: 77–85°F is ideal. (Minimum 68°F for activity).
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Humidity: 60–80% Relative Humidity (RH) is optimal.
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Best For: Greenhouses, grow tents, indoor cabinets, and tropical plant collections.
Note: If your space runs cool (below 68°F) or very dry, consider using Amblyseius cucumeris or Amblyseius californicus instead.
Application Instructions
Hang High, Keep Dry.
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Preventative Rate: 1 sachet per plant (for large plants) or 1 sachet every 2–3 feet (for dense canopies).
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Placement: Hang the sachet on a branch or stem, just above the soil line but shaded by leaves if possible.
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Maintenance: Do not open the sachets; mites exit through a pre-engineered vent.
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Frequency: Replace every 2–4 weeks depending on temperature (hotter temps = faster release).
Pro Tips for Success
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Feed Them: If you are releasing into a "clean" room with no pests, dusting with a supplemental food source (like pollen or Good Bug Diet) helps establish the population.
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No Sprays: Avoid using oils or foliar sprays while sachets are active. Even organic sprays can clog the sachet vents or harm the predators.
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Layering Strategy: If you have an active infestation, use Swirskii in bottles for an immediate knockdown, then hang sachets to maintain long-term control.
Frequently Asked Questions
Can I see the mites working?
Likely not. A. swirskii are tiny (less than 1mm), fast-moving, and often hide on the undersides of leaves. Trust the process—if you aren't seeing new pest damage, they are doing their job.
Are they safe for pets?
Yes. Amblyseius swirskii is 100% non-toxic and safe for humans, pets, and pollinators.
What if my humidity drops?
Brief drops in humidity are fine, but sustained dryness (below 50% RH) will dry out the sachet media and reduce the lifespan of the colony.
Shipping & Storage
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Freshness: Ships via 2-Day Shipping with a live arrival guarantee.
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Usage: Hang immediately upon arrival for best results.
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Storage: If necessary, store at 50–55°F for up to 48 hours.
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Warning: Do not store in a standard refrigerator or freezer (the air is too dry).
Target Pests
Environmental Needs
Selection Guide
How to Use
How They're Shipped
Hang them up, then wait.
How to deploy your sachets, and how to read the results over the next few weeks. Sachets are prevention — a slow-release nursery that ramps up over weeks, not a quick knockdown for an active outbreak.
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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 sachets somewhere room-temperature (60–75°F) and out of direct light — they'll keep for a day or two.
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Don't open the sachet
Each sachet is a self-contained breeding colony. The mites and their food source live inside; they emerge gradually through a small exit hole on the breathable face. Cutting the sachet open ends the slow release and dumps the colony all at once. Keep them sealed.
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Hang or place near the plant
Hook each sachet on a sturdy branch, hang from a stake, or set near the base of the plant — out of direct sun and away from anywhere it'll get watered. Mites travel from the sachet onto the plant on their own. One sachet protects roughly 2–3 feet of canopy; see the product description for exact spacing.
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Leave them alone for 4–6 weeks
Predator emergence ramps up over the first two weeks, peaks around weeks three to four, and tapers off through week six. You won't see the predators (they're smaller than a grain of salt), and an "empty-looking" sachet at week one means nothing. The real signal is what isn't happening — pests not establishing on protected plants.
Something visibly wrong on arrival?
Sachets that arrived torn, soaked, or with a sour smell — 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.
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.
How long do the sachets last?
Can I get the sachets wet?
Will the mites stay on the plant?
Is it safe for my pets?
Can I use them with other beneficials?
When should I start using them?
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
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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.
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