Neoseiulus Californicus 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.
Neoseiulus Californicus Slow-Release Prevention Sachets
At A Glance
Predatory Mites for Hot & Dry Conditions
The Survivor Strategy: Pest Control That Takes the Heat.
If your grow space runs hot, your humidity fluctuates, or you are between pest flare-ups, Neoseiulus californicus is the predatory mite that won’t quit.
While other predators require high humidity to survive, A. californicus is built for resilience. These slow-release sachets deploy a steady stream of generalist predators designed specifically for environments where other beneficials stall out. They are not a "rescue" treatment for massive infestations, but they are the ultimate insurance policy against pests returning when the climate works against you.
How It Works: The Marathon Runner
Unlike the fast-acting P. persimilis (the sprinter), N. californicus plays the long game.
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Starvation Resistant: They can survive longer without food, making them perfect for preventative releases before pests are visible.
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Dietary Flexibility: If spider mites aren't available, they will feed on pollen or other small arthropods to maintain their population.
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Climate Hardiness: They remain active in temperatures up to 105°F and tolerate lower humidity (down to 40% RH) better than most predatory mites.
Targeted Pests
A. californicus is a Type II Generalist predator. While it prefers spider mites, it offers broader suppression capabilities.
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Two-Spotted Spider Mite (Tetranychus urticae): Primary Target (Prevention)
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Carmine / Red Mites (Tetranychus cinnabarinus): Effective suppression
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Broad Mites (Polyphagotarsonemus latus): Preventative maintenance
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Russet Mites (Aculops lycopersici): Low-pressure management
When to Choose Californicus
Use this checklist to decide if N. californicus is the right tool for your current situation.
Go with Californicus If:
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Climate: Your environment is hot (80°F+) or dry (40–60% RH).
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Pest Pressure: You have low pest pressure or are "in between" outbreaks.
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Goal: You want to prevent a resurgence after a chemical spray or a heavy knockdown.
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Consistency: You cannot mist your plants daily to keep humidity high.
Do Not Use If:
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Active Outbreak: You see webbing, bronzing, or rapid spread. (Use P. persimilis in bottles for immediate knockdown).
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Cold Conditions: Temps are consistently below 50°F.
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 canopy/rows).
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Placement: Hang on the main stem or a branch near the canopy, away from direct light intensity if possible.
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Frequency: Replace every 2–4 weeks based on heat intensity (sachets dry out faster in hot rooms).
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Important: Do not open the sachets. Mites exit through a micro-perforated hole engineered into the paper.
Frequently Asked Questions
Can I use Californicus and Persimilis together? Yes. This is a common strategy. Use P. persimilis to attack hot spots (active infestations) and hang N. californicus sachets to cover the rest of the room and prevent spread.
Will these mites survive on flowering plants? Yes.N. californicus can feed on pollen, which allows them to stick around on flowering crops even if there are no spider mites to eat.
Are they safe for organic living soil? 100%.N. californicus is non-toxic, leaves no residue, and is safe for people, pets, and pollinators.
Shipping & Storage
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Freshness: Ships via 2-Day Air with a live arrival guarantee.
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Storage: Use immediately for best results. If necessary, store at 50°F for up to 48 hours.
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Warning: Do not freeze. Do not store near dry air sources (like standard refrigerators).
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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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 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.
I have a minor spider mite infestation. Are sachets enough?
Why should I choose Californicus over Persimilis for prevention?
I don’t see any movement in the sachet. Is it working?
How many sachets do I need?
Are these safe for flowering or "sticky" plants?
Can I use these with other preventative mites?
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.
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