Amblyseius Andersoni is primarily used as a preventive or as an out of season control rather than as a solution for bad infestations. You can also use it at the first sign of Red Spider Mite.
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You can buy these beneficial mites either loose in a tub (protected by bran) or as a pack of slow-release sachets which you can place or hang among the plants. The method of application that is more suitable for you depends on the plants to be protected. For a small number of plants with large leaves you may prefer to use the shaker tub because you can locate the predatory mites directly on the leaves of the plants to be protected. However for a large area, for plants with small leaves, or for a tall crop, the sachets may be more practical.
These predatory mites are widely used in commercial glasshouses to control unwanted plant pests. Amblyseius Andersoni is used to treat different species of Red Spider Mite (Tetranychus spp. and Panonychus spp.) and Thrips, it can tolerate a wide range of high and low temperatures (6 degrees C to 40 degrees C), but requires some level of humidity.
Amblyseius spp. are difficult to spot with the naked eye, and to tell apart even with the benefit of a microscope. The colour of the mites vary according to what they have been feeding upon.
Amblyseius are suitable for glasshouses and conservatories, as well as outside during the Summer. They hibernate in winter unless you supply artificial light but can feed on pollen and other prey when there isn't enough prey for them to survive on in the winter months, this makes them an effective preventative measure.
They can also feed and reproduce on other arthropod prey or pollen. Amblyseius Andersoni is not as voracious as the usual spider mite killer, Phytoseiulus, but it has the advantage that it can survive even when there is not much active spider mite around at the beginning of the season and is much less sensitive to temperature. It is also effective on a wider range of Spider mite species.