Chrysolina americana

Chrysolina americana, common name rosemary beetle, is a species of beetle belonging to the family Chrysomelidae. In some countries like Turkey they ‘re also known as “80’s beetle”.

Chrysolina americana
Chrysolina americana on lavender (Lavandula sp.)
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Chrysomelidae
Genus: Chrysolina
Species:
C. americana
Binomial name
Chrysolina americana

Description

Chrysolina americana can reach a length of 5–8 millimetres (0.20–0.31 in). They have colourful elytra with metallic green and purple longitudinal stripes. The wings are quite short, so these beetles cannot fly.

This species feeds on various aromatic Lamiaceae, mainly on rosemary (Rosmarinus officinalis) (hence the common name), lavender (Lavandula) and thyme (Thymus).

In the Mediterranean region females lay their eggs in late summer on the leaves of the host plants. The larvae show whitish to blackish bands. Larval development continues during the winter months. The pupal stage lasts about three weeks. The imago is released in the spring.

Distribution

Despite the species name americana, this leaf beetle is native and common to southern Europe, North Africa, the Near East and the Middle East.[1]

Introduction to the United Kingdom

This species was first discovered living outdoors in the United Kingdom in 1994. By 2002 it had become widespread in the London area, and spreading rapidly throughout. Although it is susceptible to some pesticides, it is usually recommended that home growers pick off beetles by hand, or shake them off onto a sheet of paper to remove them, if the plant affected by them is intended for culinary purposes. Otherwise, they do not present a major problem to the host plants, and damage is barely noticeable.

  • Rosemary beetle, on Rosmarinus officinalis in Molyvos, Greece
  • Image
  • Mating
  • Chrysolina americana on Salvia
  • Larva on Rosmarinus officinalis
  • Rosemary beetle on hand
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References
  1. Friedman, A.L.L. (2016). Rosemary beetle Chrysolina americana: A new invasive leaf beetle (Coleoptera: Chrysomelidae: Chrysomelinae) in Israel. Israel Journal of Entomology 46: 87–91.
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