There are many different species of flea beetle, each of them specializing on one or a few related species of host plant.
flea beetle establishment may take three to five years, and success varies with differing environmental conditions.
Control of leafy spurge is attempted through use of a small insect known as the flea beetle.
British Dictionary definitions for flea beetle
any small common beetle of the genera Phyllotreta, Chalcoides, etc, having enlarged hind legs and capable of jumping: family Chrysomelidae. The larvae of many species are very destructive to turnips and other cruciferous vegetables