Leaf beetle
Leaf beetles are a huge family of beetles called Chrysomelidae. There are tens of thousands of species in many genera, making them one of the most common and diverse beetle groups. They are mostly plant eaters, with adults feeding on leaves and flowers and larvae feeding on plant tissue. Some species eat a wide range of plants, while others are specialists. Many leaf beetles are pests of crops (like the Colorado potato beetle, asparagus beetle, cereal leaf beetle, mustard beetle, and flea beetles), but some are used to control invasive weeds.
Most leaf beetles are small to medium in size, about 1–18 mm long, and many are brightly colored or metallic. Their bodies are usually dome-shaped or oval, and their antennae are generally shorter than their bodies. They can fly, though some species are flightless.
Taxonomy of leaf beetles is complex and keeps changing as scientists learn more. Some groups that used to be considered separate families are now included in Chrysomelidae, and other subgroups have been reorganized.
Leaf beetles digest plant material with enzymes called pectinases. Some make the enzymes themselves, while others rely on bacteria living in their guts. In some species, the ability to digest certain plant materials comes from horizontal gene transfer.
Natural enemies help keep leaf beetle numbers in check. Predators of eggs include true bugs, hoverflies sometimes lay eggs near beetle eggs, and wasps may prey on larvae. Some predators eat the adults as well. A Finnish study described the natural enemies of alder leaf beetles and other leaf beetle species observed in the field.
This page was last edited on 2 February 2026, at 12:18 (CET).