They are flat and oval to rectangular, with the head hidden beneath a thin, flat hood. The nymphs are black and often covered with spines.
Many species feed on the undersides of leaves.
Upper surfaces of infested leaves turn yellow or brown between leaf veins, while the undersides become speckled with black, shiny excrement and cast skins of immature bugs. Visuals associated with this text. 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. This information becomes public property upon publication and may be printed verbatim with credit to MSU Extension.