Definition of Cucumber beetle

Cucumber beetle is a common name given to members of two genera of beetles, Diabrotica and Acalymma, both in the family Chrysomelidae. The name stems from the tendency for adults of these beetles to be found on the leaves and flowers of cucurbits; which are plant species of the melon, cucumber and squash varieties. The two most common pests in this family are the striped cucumber beetle [shown] and spotted cucumber beetle, which looks very much like a green ladybug. However, unlike the ladybug, cucumber beetles are not considered benefical insects. They are sucking invaders which harm crops and ornamental plants.