Spider mites are a tiny arachnid that appear like dust under the leaves. They occur during hot, dry weather. They can be controlled by spraying the plant every 7‑10 days with water to destroy the webs and knock the mites off the leaves. Be sure to thoroughly cover the underside of the lower leaves. They can also be controlled with the miticides Avid or Kelthane.
Monitoring: Mites are tiny and difficult to detect. Usually plant damage–stippling or yellowing of leaves–will be noticed before you spot the mites themselves. Check the undersides of leaves for mites, their eggs, and webbing; you will need a hand lens to identify them. To observe them more closely, shake a few off the leaf surface onto a white sheet of paper. Once disturbed, they will move around rapidly. Be sure mites are present before you treat. Sometimes the mites will be gone by the time you notice the damage; plants will often recover after mites have left.