Chrysolina americana, common name rosemary beetle, is a species of beetle belonging to the family Chrysomelidae.

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 can fly for short distances, but most tend to walk.This species feeds on various aromatic Lamiaceae, mainly on rosemary (Salvia rosmarinus) (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.

Description

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

Distribution

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.

Introduction to the United Kingdom

harmful

Chrysolina americana is considered a tree pest because it feeds on the leaves of various tree species, causing damage to the foliage and potentially impacting the overall health and vitality of the trees.

tree pest

Chrysolina americana is considered a garden pest because it feeds on the leaves of various garden plants, including vegetables, herbs, and ornamental plants, which can lead to significant damage and reduced plant health.

garden pest

Chrysolina americana can be considered a crop pest because it has been known to feed on the leaves of certain crops, such as potatoes and tomatoes, which can result in reduced crop yield and quality.

crop pest

Chrysolina americana is considered a pest because it feeds on the leaves of trees, garden plants, and certain crops, causing damage to foliage and potentially impacting the health and productivity of these plants.

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How much can rosemary Beetle pull?

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