chafer : Idioms & Phrases

• noun a common metallic green European beetle: larvae feed on plant roots and adults on leaves and flowers of e.g. roses
  rose beetle; Cetonia aurata.
  
• noun common North American beetle: larvae feed on roots and adults on leaves and flowers of e.g. rose bushes or apple trees or grape vines
  Macrodactylus subspinosus; rose bug.
  

WordNet

• . (Zoöl.) (a) A common European beetle (Cetonia aurata) which is often very injurious to rosebushes; called also rose beetle, and rose fly. (b) The rose beetle (a).

Webster 1913