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Cyphostethus tristriatus Juniper Shieldbug
Family: Acanthosomatidae

A fairly large green shieldbug with curved and distinctive
pinkish-red markings on the corium. This species spends the winter as an adult, emerging and mating early in the spring. The traditional foodplant is juniper, larvae feeding on the berries, but in recent years the bug has begun to use Lawson's cypress. New adults may be found from late August onwards.

Previously local and confined to southern juniper woodlands (although recently discovered on stands of juniper in northern England and Scotland), this species is now common across southern and central England at least, due to the widespread planting of juniper and particularly cypress in gardens. It is probably expanding its range.

Adult: All year; active in all but the coldest months
Length 9-10.5 mm

see illustrated life stages chart
Cyphostethus tristriatus Juniper Shieldbug
Adult: north London (October 2008) ©Tristan Bantock

Cyphostethus tristriatus Juniper Shieldbug Cyphostethus tristriatus Juniper Shieldbug
Adult: (October 2006) ©David Dupplaw

Adult: Sussex (March 2007) ©Brian Valentine

Cyphostethus tristriatus Juniper Shieldbug Cyphostethus tristriatus Juniper Shieldbug eggs
Adult: Surrey (June 2009) ©Tristan Bantock

Eggs on Lawson's cypress: Kent (June 2007) ©Brian Valentine
Cyphostethus tristriatus Juniper Shieldbug nymph Cyphostethus tristriatus Juniper Shieldbug nymph
Early instar nymph: Surrey (June 2009) ©Tristan Bantock
Final instar nymph: north London (October 2008) ©Tristan Bantock