Web Master:
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The predatory mites are a uniform orange colour. The red spider mite is a similar size with the two dark spots (feeding sacs) on either side. The spider mite do change colour in winter but tend to congregate in protective areas during the colder months so I would not expect to see them over the leaves in winter.
Treatment of mites - remove all the badly affected plant material, remove all the weeds as they can be an alternative host for spider mite. Water over head - mites prefer dry conditions and their reproduction cycle slows in wet conditions. You can purchase Predatory Mites from Bugs for Bugs, they come as strips with eggs attached ready to place in your garden. These are used successfully throughout Australia. For these to be successful there need to be sufficient red spider mites for the predatory mite to eat - not enough and the predatory mites will die before the new mites emerge.
Treatment of caterpillars. For caterpillars that are not hairy the best option is Dipel. It is made bacteria found naturally in the soil. It affects the caterpillar's digestive system and is harmless to all other insects and animals https://www.gardensonline.com.au/Shopping/GardenShop/Show_6536.aspx
Snails and slugs are difficult to control, people have tried all kinds of remedies with various levels of success, egg shells, coffee grinds, bowls containing beer or sugary water, collecting the snails at night. There are various snail baits that can be used. Multiguard, which unfortunately we don't sell, seems to be the most pet and child friendly.