noun
swallowtail butterfly larva; citrus pest caterpillar
Specifically the larva of swallowtail butterflies (family Papilionidae) that feeds on citrus leaves, often found on yuzu and other citrus trees. Considered a pest by growers.
柚子の木に柚子坊がついていた。
There was a swallowtail butterfly larva on the yuzu tree.
柚子坊は柑橘類の葉を食べる。
Swallowtail butterfly larvae eat citrus leaves.
アゲハチョウ is the adult swallowtail butterfly, while 柚子坊 refers specifically to its larva, especially as a citrus pest.
Compound of 柚子 (yuzu, a citrus fruit) and 坊 (boy, monk, or affectionate suffix for a creature). The name likely comes from the larva's association with yuzu trees.