Phytoseiulus persimilis Sachets - Slow-Release Spider Mite Protection

What Persimilis Sachets Go After

Two-spotted spider mites

Its main target, at every stage from egg to adult.

Carmine red mites and Pacific spider mites

Controlled at higher release rates.

P. persimilis eats only spider mites. It won't control broad mites, russet mites, cyclamen mites, thrips or other pests.

Already have webbing?

Sachets release predators slowly. For an active infestation, release bottled persimilis on the hot spots and hang sachets to keep predators in place afterward.

What's in the Sachet

Each sachet holds 250 persimilis packed in all life stages, for a steady flow of predators for 2-4 weeks. Hang it on the plant and the mites walk out on their own.

How Persimilis Works

P. persimilis was one of the first predatory mites used in pest management. It's a Type I specialist that eats only spider mites. Adults are about 0.5 mm long, pear-shaped and bright orange to red. Females lay eggs inside spider mite colonies, including in the webbing; eggs hatch in 2–3 days, the larvae don't feed, and the nymphs and adults eat spider mites at every stage. An adult female can eat up to 40 spider mite eggs a day above 68°F. At 70–80°F it goes from egg to adult in about a week, roughly twice as fast as spider mites, and each female lays up to 60 eggs over her lifetime.

Where It Works

Vegetables, hemp, strawberries and other soft fruit, and ornamentals, in greenhouses, indoor grow rooms, interior plantscapes and outdoor crops. Persimilis eggs need humidity above 60% to hatch.

Safe, Sustainable Pest Management

• No synthetic pesticides
• Safe around people and pets when used as directed
• Safe for use on edible crops when used as directed
• Fits easily into an existing IPM program

Sachet Release Rate

Don't fight pests, prevent them.

• Plants touching: hang 1 sachet per 3–6 sq. ft.
• Plants not touching: hang 1 sachet per plant.
• Replace every 2–4 weeks.

General starting point. Adjust for the plant and conditions, and check pests and predators regularly.

Temperature & Humidity Range

Effective range: 70–90°F; best 70–80°F
Humidity: 60–90%. Below 60%, persimilis eggs dry out and don't hatch.

How to Hang Persimilis Sachets

1. Locate plants where you want to prevent infestation.
2. Hang sachet on plant, out of direct sunlight.
3. Introduce slow release sachets every 2-4 weeks to prevent infestation.

Sachets should not be allowed to dry up entirely, and direct sunlight should be avoided. Prolonged moisture and damp environments can cause sachets to degrade or encourage fungal growth.

Pro Tips

Chemical Compatibility

Sprayed recently? Some pesticides harm predatory mites for days or weeks after they dry. Check which chemicals are safe for predatory mites and how long to wait before hanging sachets.

Should I buy sachets or bottles?
Sachets release predators slowly over 2-4 weeks and suit prevention and maintenance. Bottles put a large number of predators on your plants at once, so they suit spider mites that have already started. Many growers use both.

How do I know the sachet is working?
Look for fast, orange, long-legged mites on the leaf undersides with a magnifier, and for new growth without stippling or webbing.

My growing area is dry. Will persimilis work?
Its eggs need humidity above 60% to hatch. In consistently dry air, Neoseiulus californicus is a better fit.

Are persimilis sachets safe for people, pets and plants?
When used as directed, yes. Persimilis isn't known to bite people or pets, and it doesn't feed on plants. It eats only spider mites.

STORE POLICIES

Thank you for shopping with us! Before placing your order, please review our Shipping Policy and Refund and Return Policy. By completing your purchase, you agree to these terms.

We do not provide recommendations on pesticide use. Products are sold for home use only, not commercial use.

QUALITY GUARANTEE

If your beneficial insects or other perishable products are not viable when delivered, email info@naturesgoodguys.com within 48 hours of delivery with your order number and a description of the problem. Photos may be requested. Approved replacements ship on Wednesdays and Thursdays.

• Open your package right away and check for storage instructions. Some products need refrigeration, and improper storage voids the guarantee.
• Ice packs help moderate temperature in transit and are not expected to arrive frozen.
• Some insects need time at room temperature before they become active, and many are hard to see without magnification.

SHIPPING

• Processing: 1 to 3 business days. Orders placed by 12:00 pm Pacific may process the same day, but this is not guaranteed.
• Overnight: ships Monday to Thursday, and Friday for addresses with Saturday delivery, excluding holidays.
• Second Day: ships Monday to Wednesday, and Thursday for addresses with Saturday delivery.
• USPS: ships Monday to Friday.
• We do not ship to PO boxes.

Some products are harvested on set days, and we may hold shipments during extreme weather to protect product quality. We will contact you if your order is delayed significantly.

CHANGES AND CANCELLATIONS

Please contact us within 30 minutes of placing your order to change or cancel it.

RETURNS AND REPLACEMENTS

Beneficial insects and other perishable products cannot be returned; they are covered by the Quality Guarantee above. Unopened garden supplies and tools can be returned within 30 days. Full details are in our Refund and Return Policy.

Replacements are not available for an incorrect shipping address, storage or use instructions not followed, or packages left uncollected after delivery.