A black fungus called sooty mold may grow on the honeydew. Scale insects have a tan to brown shell-like covering or scale that protects the insect's body. Some scales are hemispherical in shape, while others are oval and flat. Mealybugs appear as white tangles of cotton on the leaves or stems. A common location is the slim, protective gap at the junctions of stems and leaves.
Houseplant insects are difficult to control.
There is no easy, simple, one-shot cure. This is a laborious task that works only on small, large-leafed plants. Dabbing each insect with an alcohol-soaked cotton swab is another possibility on lightly infested plants. Sprays can be used for houseplant insect control. Success will depend upon thoroughness and persistence.