Agrilus is a genus of jewel beetles, notable for having the largest number of species (about 3000) of any single genus in the animal kingdom. Species of the genus have a cosmopolitan distribution on all continents except Antarctica, and feed on a wide variety of flowering plant hosts. The best known species is the emerald ash borer (Agrilus planipennis), a serious pest of ash trees, with other notable species including Agrilus biguttatus and Agrilus auroguttatus, which are pests of oak trees.

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