Spider Mites

Members of the Acari (mite) family Tetranychidae

Like spiders, mites are Arachnids and not insects. Spider mites are less than 1mm in size and come in a variety of different colours. These mites chew on the leaves, causing a pale speckled appearance that can look a little similar to the damage caused by thrips.

There are approximately 1200 species of spider mite. Many species produce silk webbing to help protect them from predators, which can be a useful way of spotting them before the damage gets too bad.

One female can lay around 20 eggs a day, and they can take as little as 3 days to hatch. The fast rate of reproduction can allow populations to build up a resistance to pesticides. To reduce the risk early and thorough treatment is recommended.

Prevention

They prefer hot and dry conditions, and are fairly common in houseplants. Regular watering, and mulching of outside plants, can significantly reduce the chance of infestations.

Treatment

Oil based sprays such as Aquaticus Bugtrol (an organic fish oil mixed with pyrethrum) can also be used to smother these pests. If using Bugtrol spray in the evening to reduce the chance of harming beneficial insects.

Other Options

Spray with Maverik Insect and Mite Spray. Once dry this spray is unlikely to have much impact on beneficial insects, however spraying in the evening can minimize any harmful impacts.

You can also use the systemic Groventive spray which is best used on ornamental plants.