Caryophyllaceae-specialist
Guides
Cassida azurea
Azure tortoise beetle
Cassida azurea is a tortoise beetle in the leaf beetle family Chrysomelidae, native to Europe and Northern Asia. It was intentionally introduced to North America in 1989 as a biological control agent targeting the invasive weed Silene vulgaris (bladder campion). Host specificity testing demonstrated extremely narrow feeding preferences, with reproduction occurring almost exclusively on S. vulgaris. Field releases in Manitoba, Saskatchewan, and Alberta from 1989–1993 resulted in establishment at 8 of 18 sites, though populations have remained insufficient to achieve effective weed suppression.