Too small to be readily visible, these insects can be recognised by their fine, dense webbing, which is easier to see after misting the plant. Spider mites attack the plants epidermis, causing discolouration. Blackening of leaves and browning of plant tips are also symptoms. Plants in warm, dry indoor areas with stagnant air are especially vulnerable to these pests. A cold-water spray is effective for mild infestations, and commercial miticides for larger problems. Malathion or Kelthane (dicofol) will work, or if outdoors, predatory mites (Hippodamia convergens) and ladybugs can help control spider mites.
To help prevent an attack of spider mites (and for overall plant health) be sure your plants get adequate air circulation. This is an often over-looked requirement of succulent cultivation, and it is very important. If you have an indoor collection, and cannot let fresh air in frequently (especially this time of year), at least periodically run a fan nearby to move air around. Your plants will thank you. I promise.
THRIPS
Thrips cause metallic-like discolouration of plant tissue, especially around flowers and new growth. They are tiny, tan, winged, and fast. The only recommended treatment I have found is repeated applications of a commercial insecticide.
VINE WEEVILS
These brown beetles can be recognised by the presence of larvae and tunnels in the soil, and are chemical-resistant. Thoroughly clean the entire plant, and re-pot in fresh soil after sterilising or replacing containers.
WHITEFLIES
Leaf succulents are particularly vulnerable to these pests, which are found on the underside of leaves. They will also fly off the plant if it is moved. The primary danger is mould encouraged by their honeydew secretions. Larvae and adults can be treated with insecticidal soap, but only repeated applications of chemical insecticides will affect the eggs.
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