Definition of apple-tree borer in English:

apple-tree borer

noun

North American
  • Either of two beetles with larvae that bore into the bark and trunks of apple trees: (more fully "flat-headed apple-tree borer") Chrysobothris femorata (family Buprestidae), and (more fully "round-headed apple-tree borer") Saperda candida (family Cerambycidae).

Origin

Early 19th century.