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Species Chrysolina hyperici - St. Johnswort Beetle

Beetle on Hypericum - Chrysolina hyperici Iridescent beetle - Chrysolina hyperici Beetles - Chrysolina hyperici St. Johns Wort Beetle - Chrysolina hyperici Klamath Weed Beetle? - Chrysolina hyperici Hypericia? - Chrysolina hyperici Chrysolina hyperici - St. Johnswort Beetle  - Chrysolina hyperici hyperici or quadrigemina? - Chrysolina hyperici - male
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Longhorn and Leaf Beetles)
Family Chrysomelidae (Leaf Beetles)
Subfamily Chrysomelinae
Tribe Chrysomelini
Subtribe Doryphorina
Genus Chrysolina
No Taxon (subgenus Hypericia)
Species hyperici (St. Johnswort Beetle)
Explanation of Names
Chrysolina hyperici (Forster 1771)
Size
5-7 mm
Range
Native to w Palaearctic, introduced in ne NA & PNW - Map (1)
Season
Adults present in June and again in fall
Food
Life Cycle
Up to 2,000 reddish eggs laid singly or in small clusters on basal leaves of hostplant, mostly in fall; larvae hatch in spring; pupation occurs in the soil in late spring; adults emerge in June to feed, then enter the soil; they emerge again in fall and resume feeding; overwinters as an adult and egg
Remarks
Larvae feed during the night on shoot tips and basal and developing leaves; adults feed in clusters during the day on flower buds and terminal leaves
Introduced to control St. John's-wort, and to reduce the spread of native St. John's-wort disease (Colletotrichum gloeosporioides)
Adults are more tolerant of cooler/wetter summers than Ch. quadrigemina, whose larvae and adults are killed by May frosts, and whose adult dormancy is disrupted by summer rains.