These bugs are sap-sucking insects that can be found on a wide range of plants. The adults, when viewed from above, have a distinctive shield-like shape. The appearance of the Green shield Bug changes during its lifecycle. Batches of eggs are laid in early summer on the underside of leaves. They hatch within about 10 days. The first instar nymphs are tiny nymphs they remain close to the egg cases. With each moult the instar changes in shape and size. This image is of a 2nd instar, around 3mm long. The nymph is now foraging independently. It has a prominent black banding. By the 4th instar it will appear as a flat circular disc and by the 5th instar the wing buds will be developing. The development cycle from egg to adult takes about six weeks. When fully grown the common green shield bug (Palomena prasina) is a broad, flattened, green insect with a strongly contrasting blackish brown darker area at the rear end. The adult bugs are about 10mm-14mm long and are often seen basking in the sun in late summer on a wide variety of plants. In the autumn green shield bugs change their green appearance to deep brown, so they can remain camouflaged amongst the leaves and dead wood and they will over-winter in this state. In spring they revert to their summer green colouring. Picture taken on 8th August 2011 near Northill, Bedfordshire
Added:
1st Jun 2012 by Diane Earl
Subjects:
Biology, Environmental Science
Key Stages:
Foundation, Key Stage 1, Key Stage 2, Key Stage 3, Key Stage 4, Key Stage 4+
Geocode: Woods near Northill, Bedfordshire
Date of artefact: 6/8/11
Keywords:
insect shield bug
Related Links:
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