Amblyseius andersoni Sachets - Outdoor Spider Mite Preventative System


Our outdoor spider mite sachets contain the predatory mite Amblyseius andersoni. This predatory mite feeds on two spotted mite/ red spider mite (Tetranychus urticaea) and other mites including Russet hemp mite, Broad mite, Cyclamen mite, Carmine mite, Russet mites and European mite.

We advise using Amblyseius andersoni as a preventative system against spider mite on outdoor plants. These predators can feed on pollen, so can be applied before spider mite is observed, giving protection to plants and preventing outbreaks.

If protecting plants from spider mite indoors, better results can be found with Amblyseius californicus sachets.

If spider mite is present in large numbers already (signs of leaf damage and webbing) we advise switching to our curative system.

Please ensure you have read the appropriate conditions for using andersoni before purchase, these can be found below.

Why Amblyseius andersoni instead of other predators?

Amblyseius andersoni can be used as a preventative system on plants kept outdoors. Andersoni will feed on other pests or pollen meaning it can be introduced earlier or when spider mite is not present, preventing outbreaks before they can take hold.

If preventing spider mite indoors we suggest using Amblyseius californicus sachets for best results.

What conditions do Amblyseius andersoni need?

Amblyseius andersoni are active at temperatures between 6-40 degrees making them quite versatile for use in numerous environments. They can also be used with lower levels of humidity than other predators.

How long do the predators last?

Each sachet contains around 250 predators and acts as a breeding site for these numbers to multiply before coming out onto the plant. The sachets last around 4 weeks and should then be replaced to keep a steady flow of predators on the plant.

How many sachets do I need?

We recommend applying the sachets at a rate of 1-2 per plant. Based on an average plant 1m in height, with a low number of spider mite.

If you have a large infestation of spider mite (signs of webbing, large groups of spider mite, leaf damage) we recommend switching to a curative system. 

How do I apply the sachets?

Each sachet comes with a hook which can be placed on plant stems or leaves. There is a pre formed hole ready to release the predators which will make their way out in a steady stream over the 4 week cycle. You can also tear open the sachets and sprinkle directly onto the plants but this will reduce the life cycle to around 2-3 weeks. 

Can I store the sachets?

Unfortunately due to the 4 week life cycle you cannot store the sachets for later use. Apply the sachets immediately on receipt.

Chemical Pesticides

Amblyseius andersoni is a living creature and can be affected by any chemical pesticides used within the previous few weeks. As a guide cease using pyrethrum or SB plant invigorator 2 days prior to use and other persistent chemicals or universal bug killers 1-2 weeks before using predators. 

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