Lerp protecting a psyllid nymph

Lerps are protective covers constructed by the nymphs of jumping plant lice.
Lerps are formed from the honeydew excreted by the nymphs on the leaf surface. The honeydew consists of sugars and amino acids which crystallises on contact with air. Psyllids are tiny sap-sucking winged insects that feed on native trees and shrubs, especially eucalypts.