They suck plant juices and heavy infestations will coat the leaves with sticky honeydew. Use house plant insect sprays according to label directions.
Scales are usually brown, hard shells attached to the stems or undersides of the leaves.
Sprays are not effective since the shell protects the insects. Heavily infested plants should be discarded. Physically removing the scales and then controlling immature stages with sprays may control the problem on lightly infested plants. This information is for educational purposes only. References to commercial products or trade names does not imply endorsement by MSU Extension or bias against those not mentioned.