Stems and leaves are covered with white, cottony, cushionlike masses; brown, crusty bumps; or clusters of somewhat flattened reddish, gray, or brown scaly bumps. These masses don''t move when touched. The bumps can be scraped off or picked off easily. Leaves turn yellow and may drop. A shiny or sticky material may cover the leaves and stems. Sooty mold may develop on the sticky substance.
Isolate infested plants as soon as scales are discovered. Remove as many scales as possible with a cloth or toothbrush dipped in soapy water. Spray plants with an insecticidal soap or a horticultural oil labeled for use indoors.