Neoseiulus californicus Slow-Release Prevention Sachets

For a room that runs hot, or dry, or both. Neoseiulus californicus is the predatory mite that keeps working where the specialists stall — active up to about 105°F and tolerant of humidity down to 40%, which covers most of a heated house in winter and most of a grow tent in August. It takes spider mites above all, with broad and cyclamen mites as a bonus.

What makes it the right sachet species is what it does with no pest to eat. Californicus feeds on pollen and other small arthropods, so the colony holds on a clean plant and waits, and it survives longer without food than most predatory mites. A specialist would starve. That is the difference between a sachet that is doing something and a sachet that is decoration.

And it is as easy as pest control gets. Nothing to mix, nothing to spray, no residue on the leaves, no re-entry interval and no dose to get right — you hang it in the canopy and leave it. No loose carrier on your foliage, nothing to keep children or pets away from, and nothing a spider mite can develop resistance to. Safe around people, pets and anything you plan to eat.

It is the marathon runner rather than the sprinter. Against an outbreak already underway — webbing, bronzing, spreading — it will not catch up on its own, and persimilis in a bottle is what does. Hang these across the rest of the room behind that.

Best for: Prevention in hot, dry or brightly lit spaces, and holding ground after a knockdown.
How many: One sachet every three to five linear feet, or one per large plant. Sold as single sachets, with discounts on quantity.
Placement: Hang in the canopy, shaded, away from direct light and clear of irrigation. Do not open the sachet — the mites exit through a micro-perforated hole engineered into the paper.
Replace: Every four to six weeks, at the shorter end in a hot dry room where the sachet dries out faster.
Safe around: People, pets, plants and food crops.
Not for: An active outbreak with visible webbing. Or a consistently cold space, below about 50°F. Not russet or hemp russet mites — those are eriophyids, and Amblyseius andersoni is the predator there.

Targeted Pests

Neoseiulus californicus is a Type II Generalist predator. While it prefers spider mites, it offers broader suppression capabilities.

• Two-Spotted Spider Mite (Tetranychus urticae): Primary Target (Prevention)

• Carmine / Red Mites (Tetranychus cinnabarinus): Effective suppression

• Broad Mites (Polyphagotarsonemus latus): Preventative maintenance

When to Choose Californicus

Use this checklist to decide if N. californicus is the right tool for your current situation.

Go with Californicus If:

• Climate: Your environment is hot (80°F+) or dry (40–60% RH).

• Pest Pressure: You have low pest pressure or are "in between" outbreaks.

• Goal: You want to prevent a resurgence after a chemical spray or a heavy knockdown.

• Consistency: You cannot mist your plants daily to keep humidity high.

Do Not Use If:

• Active Outbreak: You see webbing, bronzing, or rapid spread. (Use P. persimilis in bottles for immediate knockdown).

• Cold Conditions: Temps are consistently below 50°F.

Application Instructions

Hang High, Keep Dry.

• Preventative Rate: 1 sachet every 3–5 linear feet, or 1 per large plant.

• Placement: Hang on the main stem or a branch near the canopy, away from direct light intensity if possible.

• Frequency: Replace every 4–6 weeks, and at the shorter end of that in a hot dry room, where the sachet dries out faster.

• 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

• Freshness: Ships via 2-Day Air with a live arrival guarantee.

• Storage: Use immediately for best results. If necessary, store at 50°F for up to 48 hours.

• Warning: Do not freeze. Do not store near dry air sources (like standard refrigerators).