Thrips Rapid Response Kit: Predatory Mites and Nematodes for Thrips
Swirskii mite (Amblyseius swirskii) · Sf nematode (Steinernema feltiae)
5.0 · 4 reviewsA two-part kit: a bottle of Amblyseius swirskii predatory mites for the canopy and a pack of live Steinernema feltiae (Sf) nematodes for the soil, both used the same day. The mites take first-stage thrips larvae on the leaves and the nematodes take the pupae in moist soil. Neither one kills adult thrips.
- Best for
- Thrips
- Conditions
- 68–86°F, 60% RH and up
- Good to know
- Both halves are hard to spot. The mites look like pale grains and the nematodes look like nothing at all in the water. That's normal for both. What to expect
When to choose something else
Not for adult thrips, echinothrips.
Shipping details
Shipping
| Est. ships | Est. arrives | |
|---|---|---|
| Standard | ||
| Overnight |
Raising a fresh batch for you? Add up to 7 days to both dates.
Estimates. Overnight speeds up the trip, not the packing: its one day on the truck starts once it ships.
- Monday to Thursday only. Nobody spends the weekend in a warehouse.
- Check your address at checkout. Bugs are brilliant at finding aphids and hopeless at finding a new front door.
Ordering with friends? Get group pricing
Everyone picks their own. It ships to you in one box.
Buying for a greenhouse, farm or shop? Ask about wholesale
Right for you?
Your pest, your growing space, how many you need
What it treats, and what else it eats
Treat. A specialist, made for one pest: thrips.
| Pest | Treats or prevents | Why |
|---|---|---|
| Thrips | Treats | Main prey. It goes looking for these first. |
Not for adult thrips, echinothrips.
How many thrips rapid response - two stage system do I need?
Count the plants you want to cover.
Size guide
| Size | In the kit |
|---|---|
| X-Small | 10 Plants |
| Small | 25 Plants |
| Medium | 50 Plants |
| Large | 100 Plants |
| X-Large | 250 Plants |
- Each size is one release. The treatment plan below says when to check again.
- Count the plants you want to cover.
- Heavy pressure, go one size up; light, one size down. A large plant with a dense canopy counts as three or four plants.
Conditions for releasing thrips rapid response - two stage system
Thrips rapid response - two stage system work best when the growing space stays 68–86°F, 60% RH and up. These are preferred conditions, not hard limits.
Best temperature68–86°F
The band where both halves perform. Swirskii gets faster as the room warms; the nematodes want the substrate in the same range rather than baking.
Best humidity60% RH and up
Ideal for mite activity, and it keeps the nematodes from drying out on the way in. Keep the substrate consistently moist — not waterlogged — for two weeks after the drench, because dry soil kills them.
RefrigerateNematodes only
This is the one that catches people. The nematodes go straight into the fridge until you mix them. The mites do not — they do best away from cold, dry fridge air. If the mites need to wait, the bottle is best kept horizontal somewhere cool and dark at 55–60°F and released within about 48 hours.
Releasing
What to do, and what you'll see
What to expect
- Both halves are hard to spot. The mites look like pale grains and the nematodes look like nothing at all in the water. That's normal for both.
- Adults stick around a while. Flying thrips you see now were already grown before you started. They fade out as the mites and nematodes work on the next generation.
- New growth comes in clean. Over two to three weeks the new leaves come in unmarked. Old silver scarring stays, so judge by the fresh growth.
How to release thrips rapid response - two stage system
You may need to retreat
Eggs and young pests you can't see yet keep hatching after the first release. A second round catches that next wave.
You're done when you're seeing fewer pests and new growth comes in clean. Still seeing them, or fresh damage on new growth, at the check? That's your cue for another round.
Put it on a schedule and the next kit arrives on its own, 10% off the first and 15% off every one after. If it turns out you don't need it, pause or cancel anytime from your account.
Reviews
What growers say
What people say
5.0 out of 5, from 4 reviews.
Absolutely love watching my little mercenaries hunt down pests!
They arrived in a great amount of time and I haven seen too big of a difference yet but also it’s only been a week or so
Great combo im so lucky to have found you guys! Definitely works!! Karen is awesome too! Great customer service!
Hi Chloe, thank you so much for your wonderful review! We're thrilled it’s working, but refuse to tell Karen she was actually helpful. ;) We appreciate your support!
Incredible products! Will definitely recommend to anyone who listens!
Pairs well with
Small things that help them work
-
Add alongside
Thrips Total Control - Three Stage System
The flying adults.
from $150
-
Add alongside
Thrips Ultimate Control - Heavy Pest Pressure System
When it is already runaway.
from $266
-
Add alongside
Amblyseius swirskii Prevention Sachets
Keeping it from starting again.
$4.75
-
Add alongside
Root Network
For the roots: mycorrhizae and microbes that help roots take up water and nutrients. Use at repotting, then a monthly drench.
from $15
More to know
Ways to buy, questions and reading
Ways to buy
Once, on a schedule, with friends, or mixed with other predators.
- One time
- A single kit, this once. Free shipping on orders of $30 or more, $15 under that.
- On a schedule
- 10% off your first box, 15% off every box after. Skip, move, pause or cancel from your account.
- Group order
- Friends each pick what they want, and it ships to you in one box.
- Mix and match
- Buy several predators together and they get cheaper.
For the curious
Everything else we know about them. Tap a topic to open it.
Is this your pest?
Rapid Response is built around one fact about thrips: they live in two places at once. Larvae feed on the leaves; pupae sit in the soil. Treat one and the other half of the population survives and re-infests.
Thrips rasp the leaf surface and drink what comes out, leaving silvery or bronzed scarring with black frass specks on it, usually worst on the newest tissue and inside folded growth. Flowers come out streaked and distorted. The adults are slim and quick and fly up when you disturb the plant.
This kit covers western flower thrips and onion thrips, at the two stages it reaches: Amblyseius swirskii takes first-instar larvae on the foliage, and Steinernema feltiae nematodes take the pupae in the substrate. Neither agent kills adult thrips — if the flying adults are the problem, Thrips Total Control adds Orius insidiosus, which does.
Then: is Rapid Response the right answer to it?
Choose this if
Choose it when thrips are active at manageable levels and the larvae and pupae are what you need to reach. Closing both halves of the cycle in one day is what gets this somewhere a single agent stalls — and it does it with less work than a spray program: there is nothing to mix beyond a watering can, no residue on the leaves, no re-entry interval and nothing to keep children or pets away from. The mites walk the leaf undersides and folded new growth that a spray would never wet, and the nematodes reach a life stage no foliar treatment can touch at all. Thrips cannot develop resistance to either one.
Choose something else if
Neither agent kills adult thrips, so the ones flying now will live out their lives while you kill the generation behind them — if that is the problem, Total Control is the kit that adds Orius. A runaway infestation with widespread damage in both soil and canopy wants Ultimate Control instead. And it is the wrong kit for Echinothrips, the dark, sluggish thrips that stays on the leaf blade rather than the flowers: it pupates on the leaf instead of dropping into the substrate, so the nematode half has no pupal stage to attack.
What it kills, and what it won't
Worth being plain about the adults, because it changes what you expect to see. Swirskii takes the first larval stage, second instars are large enough to fight it off, and adults are out of reach entirely. So the flying thrips you can see today will keep appearing for a while — what this kit is doing is emptying the generation behind them. If the adults themselves are the problem, Total Control is the kit that adds Orius.
How it works
What it does to the pest, what it does on the plant, and what that leaves you looking at.
Two habitats, closed the same day
Swirskii go onto the foliage and eat first-instar larvae before they have done much damage. Sf nematodes go into the substrate and kill the pupae waiting to emerge as next week's adults. Both halves go in on the same day on purpose — a week between them lets a generation through.
They reach what a spray cannot
Mites walk. They get onto leaf undersides and into folded new growth where thrips larvae actually feed and where spray coverage is always worst. The nematodes go somewhere no foliar product reaches at all: into the media, after a life stage that is otherwise simply waiting out your treatment.
You read it on the cards and the crown
You will not watch either agent work. Judge it the way a grower does — blue sticky card counts flattening, and new leaves opening clean — rather than by trying to find a mite. Existing silver scarring never goes away; it is a record, not a reading.
Book the second round now. For a real infestation, a repeat at 14 days is the normal course, not a sign the first failed — thrips generations overlap, and eggs laid before you started are still hatching.
About the Rapid Response kit
Two products in one box, because thrips use two habitats. A bottle of loose swirskii for the canopy and a pack of live Sf nematodes for the substrate, both going in on the same day.
New to beneficials?
Five things that catch almost everyone the first time.
What arrives
Two things: a bottle of loose swirskii in a vermiculite carrier, and a pack of live Sf nematodes.
Nematodes into the fridge the moment you open the box. The mites stay at room temperature and go out today — putting them in the fridge is the mistake this note exists to prevent.
Both halves the same day. The point of the pair is closing the cycle; a week between them lets a generation through.
When it ships, and when it lands
Shipping
We ship when they're ready to travel. Live orders go out Monday to Thursday. If a colony needs a beat to peak, or we're propagating a fresh batch, yours might hold up to a week. All mites and insects ship 2-day or Overnight depending on what's best for them.
When it lands
Open it the day it lands. Sprinkle the swirskii across the canopy, concentrating on new growth where first-instar larvae feed. Then mix the nematodes with room-temperature dechlorinated water — chlorine kills them before they reach the soil — and drench every pot, moist beforehand, then water again afterwards so they reach the root zone.
Why we pack extra
Two days in a van is a long trip for something this small, so we send more than you paid for.
A predatory mite is the size of a grain of table salt. It ships in a bottle, in a van, for two days.
A trip like that is hard on anything this small, so we price it in: the number on the label gets counted out, and then roughly 15% more goes in on top as a cushion.
Your 1,000-mite bottle leaves here holding more than 1,000. The cushion is on us.
If you can see them
Ladybugs, lacewing larvae, Orius — the minute pirate bug — and the beetles. These are the ones big enough to see.
Cold insects are very good at sitting still. That's normal. Release them as this page says, and watch the pest instead.
Something look wrong? Email info@fgmnnursery.com with your order number.
If you can't see them
Mites, nematodes, eggs — and this kit is two of the three. A bottle of carrier looks the same whether it holds live mites or none, and a nematode pack tells you nothing at all from the outside. No photograph settles either, so we don't ask you to take one.
Email info@fgmnnursery.com and our entomologist takes you through the diagnostic instead — where the box sat, what your room was doing, and then what the pest is doing about ten days later.
Seventy-two hours from delivery, either way, with your order number. Replacement or store credit, your pick.
Questions about thrips rapid response - two stage system
Will I have bugs flying around my house?
No. They stay on the plants, where their food is.
Why do I need two different predators?
Thrips spend part of their life on the leaves and part in the soil. Using only one predator allows the other half of the population to survive and re-infest your plants.
How quickly will I see results?
What you are watching for is fewer active thrips — how long that takes depends on how heavy the infestation is.
Are these safe for my pets?
Yes. Both Swirskii and Sf nematodes are non-toxic and harmless to humans and domestic animals.
Can I use this as a preventative?
It's built for active infestations. For keeping clean plants clean, slow-release swirskii or cucumeris sachets are the better fit.
Do I need to repeat the treatment?
For heavy infestations, we recommend a second application 14 days later to catch any thrips that were in the egg stage during the first release.
How do I store them?
Release immediately upon arrival. If you need to wait, they're best kept in a cool, dark place (50°F) and released within about 48 hours.
How big a kit do I need?
Size it by plant count. The kits run from 10 to 250 plants:
- Count every pot in the space, not just the damaged ones. Every pot gets the nematode drench, because adults fly and pupae can be in any of them.
- Heavy pressure (whole leaves gone silver, adults lifting off in numbers): go one size up.
- Light pressure (a few silver flecks, one or two plants): one size down.
- One kit is one round: both halves go in the same day, mites on the canopy and nematodes in the soil.
- Plan a second round for a real infestation, both halves again. Check at about 14 days: new growth coming in unmarked and blue card counts flattening.
Keep reading
Field Notes from the FGMN Nursery team.
How to Treat Thrips (And Why It's Harder Than Everyone Says)
Thrips are one of the most frustrating pests in cultivation — not because they're invincible, but because most…
Your Thrips Treatment Doesn’t Include Leaf Repair
Old scars do not tell you whether thrips treatment is working. Here’s how to track live pests, spot…
Thrips Never Seem To Go Away
Not on the underside — inside it. Which means that when you sprayed, a large share of the…
Sources
Published guidance from university extension services. The release tips on this page also draw on what we see shipping these every week.