A large mothlike butterfly (Megathymus yuccae) of the family Megatimidae, whose larva bores in yucca roots.
A California boring weevil (Yuccaborus frontalis).
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Webster, Noah. Entry for 'Yucca Borer'. Noah Webster's American Dictionary. https://www.studylight.org/dictionaries/eng/web/y/yucca-borer.html. 1828.