adult and larval stages
Technical term in entomology referring collectively to both adult and larval forms, often used in contexts like pest control or life cycle descriptions.
This insecticide is effective against both adult and larval stages.
We observed the morphological differences between the adult and larval stages.
Compound of 成 (sei, 'adult') + 幼虫 (yōchū, 'larva'), literally 'adult-larva'. The exact historical derivation is uncertain, but the term is used in modern technical contexts.