Which ornamental pests are primarily motionless during most of their lives?

Scales are primarily motionless during most of their lives, which is a characteristic feature of these pests. Unlike many other insects, scales often attach themselves to a host plant and remain stationary for extended periods. They use their specialized mouthparts to feed on plant sap, which further reinforces their immobility since they do not need to move around in search of food.

This immobility helps them blend in with the plant, making it harder for both the natural predators of the scales and human observers to detect them. Their waxy coating or shell can also provide protection from environmental stresses and chemical interventions. In contrast, pests such as aphids, mealybugs, and spider mites typically exhibit more mobile behavior, allowing them to move from plant to plant or adjust their position on the host plant as needed for feeding or evading threats.