What is the name of the nymph stage of scale insects?

The nymph stage of scale insects is known as the "crawler." In the life cycle of scale insects, after the eggs hatch, the first stage of the nymph is typically called the crawler. This stage is mobile and disperses to find a suitable place to settle down and feed. Once it settles, it grows and eventually develops into an adult, where it may lose its mobility and develop protective scales.

The term "instar" refers to any stage of development between molting events in an insect's life cycle, but it does not specifically denote the nymph stage for scale insects. "Pupa" is a stage in the life cycles of other insects that undergo metamorphosis, such as butterflies, where an organism is in a transformative state; this does not apply to scale insects. "Larva" is a term commonly used for the immature form of insects that undergo complete metamorphosis, such as beetles and butterflies, which is also not relevant to scale insects, as they do not have a larval stage like these groups.