Green Shieldbug - Palomena prasina
Family - Pentatomidae
Also known as - The Green Stink Bug

Green Shieldbug - Palomena prasina
Summer adult
Photos ©2001–
Green Shieldbug - Palomena prasina, click for a larger image
Winter adult prior to hibernation
Click bottom photos for a larger image
Black Horehound - Ballota nigra, click for a larger image
Can you find one in this photo ?

A member of one of the four families of Shieldbugs to be found in the UK.  A flattened shield shaped, (from where it derives its name) green, sometimes brown bug growing to 15mm (0.6in) long, with a distinctive triangular scutellum on its back between the forewings and a brown patch at the tail.  They have five segments to their antennae whilst most other families of bug only have four segments and are longer.  Found in much of Europe, the British Isles (sparse in Scotland) and the Eastern and Southern states of America, in hedgerows, grasslands and at woodland edges, where they feed on vegetation.  It is very much rarer in the north parts of its range.

Their colouration affords them excellent camouflage amongst the greenery and they can be extremely difficult to spot, there is one on the photos.  Bright green during the summer, they turn a darker green to brown in the autumn before hibernating over the winter as adults.  Before seeking shelter they are seen in late summer and autumn sitting on plant foliage in the sun.  They are also visible in early summer when they lay small clusters of eggs on the undersides of leaves.  It occurs in a wide range of habitats, but towards the edge of its range seems to be more confined to woodland.  Farming areas can yield good numbers in crops like cabbage, cotton, etc. and in nearby roadside vegetation.  Many species will be drawn to lights at night.

Female Shieldbugs lays several groups of 20–30 of barrel–shaped eggs on plant leaves which can number to over 200 eggs, these mature to wingless nymphs which crawl between plants to feed.  Both nymphs and adults feed on plant sap which they do with mouth parts specially adapted for sucking.  The life cycle from egg to adult takes about six weeks, and there can be two or more generations each year.  They over winter as adults, emerging from hibernation a bright green colour in May.

Larvae are often seen during the summer months with a generation of adults appearing in September.  They feed mainly on Hazel but also on other shrubs.  The Shieldbugs alternative name, Green Stink Bug, refers to its smell which it leaves as a trail over fruit and vegetation, and in large numbers this can spoil a crop, they will also make this smell if handled or disturbed, producing it from glands in the thorax.

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