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Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

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Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

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Previous events


Species Chrysolina hyperici - St. Johnswort Beetle

Beetle on Hypericum - Chrysolina hyperici St. Johns Wort Beetle - Chrysolina hyperici St. Johnswort Beetle - Chrysolina hyperici There were many brown ones around- he stood out - Chrysolina hyperici Klamath Weed Beetle? - Chrysolina hyperici hyperici or quadrigemina? - Chrysolina hyperici - male St Johnswort beetle - Chrysolina hyperici St. Johnswort beetle - Chrysolina hyperici
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)
5-7 mm
Native to w Palaearctic, introduced in ne NA & PNW - Map (1)
Adults present in June and again in fall
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
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.