Amblyseius Andersoni Slow-Release Prevention Sachets

Andersoni is a polyphagous predator, meaning it eats a wide variety of pests. It is particularly valuable for controlling microscopic mites that other predators miss.

• Primary Targets: Two-Spotted Spider Mites, Hemp Russet Mites, Broad Mites, and Cyclamen Mites.
• Secondary Targets: Thrips larvae (first instar), Whitefly eggs, and pollen.
• Micro-Mite Control: Because Andersoni is slightly smaller than other predators, it is excellent at hunting the tiny Russet and Broad mites that hide in plant crevices.

This is the most adaptable mite in our lineup, thriving in conditions that would stress other species.

• Temperature: Active between 43°F - 100°F (6°C - 38°C). Ideally 68°F - 77°F.
• Humidity: Requires moderate humidity (above 40–50% RH). It is more forgiving of dry air than Persimilis but less drought-tolerant than Californicus.
• Food Source: Can survive on pollen and fungal spores for weeks without prey, making it ideal for preventative sachets.

Not sure which sachet is right for your grow? Here is how Andersoni compares to the other slow-release options.

• Choose Andersoni (The All-Weather Generalist): If you are growing outdoors, in unheated greenhouses, or specifically need protection against Russet & Broad Mites. It tolerates the widest temperature range and eats the widest variety of pests.
• Choose Special Blend (The Ultimate Shield): If you want total peace of mind for high-value crops. This powerhouse sachet contains four different predators (Andersoni, Cucumeris, Swirskii, and Persimilis) to maintain a defense against Thrips, Whiteflies, and Spider Mites simultaneously.
• Choose Californicus (The Hot & Dry Specialist): If your grow room is consistently hot (80°F+) and humidity is low. Californicus is a specialist at surviving in drought-like conditions where Andersoni might dry out.
• Choose Persimilis (The High-Humidity Specialist): If you are maintaining a crop with a history of Spider Mites in a humid environment. Persimilis is a more aggressive feeder than Andersoni, but it is strictly for Spider Mites and cannot survive if humidity drops.

Important Note: Sachets are for prevention. If you already have webbed plants or a heavy infestation, sachets are too slow. You need to use Loose Mites (bottles) for immediate knockdown.

Our sachets are mini-breeding systems that release fresh predators over 4–6 weeks.

• Placement: Hang 1 sachet every 3–5 linear feet along crop rows, or roughly 1 per large plant. Place them in the middle-to-upper canopy where pests are most likely to travel.
• DO NOT OPEN: Never tear or cut the sachet open. The paper packet is a breeding nursery designed to release mites slowly through the pre-punched hole. If you open it, you destroy the colony and lose the slow-release benefit.
• Handling: Hold the sachet by the cardboard hook or tab. Do not squeeze the belly of the sachet, or you will crush the mites inside.
• Maintenance: Do not spray water directly onto the paper sachet, as it can drown the colony. Mist the leaves around it instead.
• Timing: Replace sachets every 4 weeks to ensure continuous protection.

Packaging: Sold in boxes of paper sachets containing a bran/vermiculite carrier and a food source (feeder mites) to sustain the colony during transit.

Viability: You will not see massive movement inside the sachet immediately, as the population breeds inside.

Storage: Hang immediately. Do not refrigerate sachets, as the condensation can ruin the paper and kill the colony. Store at 55–60°F for no more than 24 hours if necessary.

Nope! Never tear open the sachet. The sachet is a nursery. The mites breed inside and slowly crawl out of the small pinhole over the course of 4–6 weeks. If you pour them out, you lose the "slow release" benefit.

Yes. Andersoni is one of the few commercially available predators that effectively targets Hemp Russet Mites and Broad Mites. However, because these pests are microscopic, we recommend using Andersoni preventatively or at the very first sign of damage.

Yes. Because they tolerate cooler temperatures and temperature fluctuations, Andersoni is excellent for outdoor gardens, fruit trees, and vineyards. Hang the sachets on branches where they are shaded from direct, scorching noon sun.

It is hard to see with the naked eye. If you look closely at the exit hole with a macro lens or loupe, you should see tiny mites exiting periodically. The best sign of success is a lack of pest damage on your new growth.

Absolutely. Use Persimilis to "put out the fire" (knock down active spider mites) and hang Andersoni sachets to "fireproof the building" (prevent them from coming back).

It usually comes down to temperature and pest type. If you have colder nights (below 60°F) or are worried about Russet Mites, choose Andersoni. If you are growing in a hot, dry warehouse and only worry about Spider Mites, choose Californicus.