Chrysolina

Chrysolina quadrigeminasome of its natural enemies
Chrysolina is a large genus of leaf beetles in the subfamily Chrysomelinae.wikipedia
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Tansy beetle

C. graminis
The species Chrysolina cerealis and C. graminis are protected in the United Kingdom.
The tansy beetle was first described by Linnaeus in 1758 in the 10th edition of Systema Naturae as Chrysomela graminis and was later transferred to the genus Chrysolina.

Allochrysolina

Subgenus Allochrysolina
Allochrysolina is a subgenus of the genus Chrysolina of the subfamily Chrysomelinae within the family of leaf beetles.

Chrysomelinae

chrysomelineaquatic leaf beetle
Chrysolina is a large genus of leaf beetles in the subfamily Chrysomelinae.
Chrysolina

Hypericum perforatum

St John's wortSt. John's wortSt. John’s Wort
To control Hypericum perforatum (St John's wort), C. hyperici was successfully naturalized in Australia in the 1930s and several species, especially C. quadrigemina, were introduced to California in the late 1940s.
In western North America three beetles Chrysolina quadrigemina, Chrysolina hyperici and Agrilus hyperici have been introduced as biocontrol agents.

Weed

weedsweedy speciesvegetable pests
All species of Chrysolina are phytophagous, feeding on specific food plants, and some of them have been used for biological control of weeds.
An example is Klamath weed, that threatened millions of hectares of prime grain and grazing land in North America after it was accidentally introduced, but was reduced to a rare roadside weed within several years after some of its natural enemies were imported during World War II. In locations where predation and mutually competitive relationships are absent, weeds have increased resources available for growth and reproduction.

List of Chrysolina species

* List of Chrysolina species
This is a list of 130 species in Chrysolina, a genus of leaf beetles in the family Chrysomelidae.

Chrysolina cerealis

The species Chrysolina cerealis and C. graminis are protected in the United Kingdom.

Chrysolina fuliginosa

Chrysolina fuliginosa (Olivier, 1807)

Chrysolina bicolor

Chrysolina bicolor (Fabricius, 1775)

Chyrsolina virgata

C. virgata
Chrysolina virgata is a species of leaf beetle in the genus Chrysolina.