How to check for spider mites.
Spider mites live on the underside of leaves, and are reddish brown or pale in color, oval-shaped, and very small.
Obvious signs of infection are white webbing, yellow blotches on leaves, and even silver or bronze streaks. If an infection gets particularly bad, leaves can start falling off.
To confirm an infection, take a leaf and shake it over a sheet of paper.
A few spider mites will fall off. They can be then looked at with a magnifying glass.
Check more often in dry and dusty conditions.
Dealing with them naturally
* Wipe leaves with a sponge regularly.
* Spray plant with a hose on high pressure, targeting the underside of leaves.
* Rubbing alcohol on leaves will kill spider mites.
* Remove infested leaves immediately and discard in trash.
* Remove weeds, particularly broad leafed ones, because these give spider mites hiding places.
* Make your own miticide: Boil a quart of water then take it off the heat.
Once it has cooled slightly add two teaspoons of crushed fresh garlic. Once it has cooled, add a squirt of dish soap to the tea, and then put ina spray bottle. Spray the underside of infected leaves with the tea every three days.
* Encourage the presence of ladybugs and other insects that prey on spider mites.
* Some other natural miticides: Neem oil, rosemary oil, cinnamite and pyrethrum.
Dealing with them chemically.
* Use sulphur.
* Buy products at a garden store to kill them. Follow the manufacture's instructions.
* Use a strong insecticidal soap inside.
Plants that are highly prone
Some plants that are highly prone to spider mite attacks are listed here:
Aspidistra elatior 'Milky Way.'
Codiaeum variegatum 'Petra.'
Cordyline fruticosa 'Kiwi.'
Hedera helix (English ivy)
Acorus spp. (sweet flag, Japanese rush)
Adenium obesum (desert rose)
Alternanthera spp. (including A. dentata 'Purple Knight')
Aspidistra elatior (cast-iron plant)
Breynia disticha cvv. (snow bush, snow on the mountain)
Brugmansia cvv. (angel's trumpet)
Chamaedorea seifrizii (bamboo palm)
Cissus rhombifolia (grape ivy)
Colocasia cvv. (elephant ears)
Datura cvv. (devil's trumpet)
Dieffenbachia spp. (dumb cane)
Dracaena marginata (Madagascar dragon tree)
Gardenia jasminoides (gardenia)
Hedera canariensis (Algerian ivy)
Heliconia psittacorum cvv.
Hibiscus rosa-sinensis (tropical hibiscus)
Impatiens spp. (impatiens)
Jasminum sambac (jasmine)
Maranta leuconeura cvv. (prayer plant, rabbit tracks)
Musa spp. / Ensete spp. (ornamental banana)
Plumeria cvv. (frangipani)
Polyscias balfouriana (balfour aralia)
Polyscias fruticosa (ming aralia)
Primula vulgaris (primrose)
Ravenea rivularis (majesty palm)
Schefflera arboricola (umbrella tree)
Schefflera elegantissima (also known as Dizygotheca elegantissima) (false aralia)
Stromanthe sanguinea cvv.
Hope I helped