Dock Leaf/Dock Bug

Coreus Marginatus

Dock Leaf Bug
Dock Bug
The Dock Leaf Bug, shortened to Dock Bug, is called a Shieldbug in the UK (although experts separate its order, Coreidae, from true Shieldbugs Pentatomoidea) and is called a Squashbug in North America (a term which has travelled to the UK). Like most Shieldbugs, it lives on plant sap, in this case the alkaline sap of the Dock Leaf that we use to neutralise the acid of stinging nettles.
Dock Leaf Bug
Dock Leaf Bug
Dock Bug
Male and female are of similar appearance, mottled brown with brown membranous wings under shortened wing cases, brown legs and orange-brown antennae with black tips.
Dock Bug Dock Leaf Bug Dock Leaf Bug
The underside. Shieldbugs and Squashbugs are also called Stink Bugs in North America, as they can excrete a stinky, noxious liquid if threatened.
Dock Leaf Bug Dock Leaf Bug Dock Bug
The black upper abdomen and yellow lower abdomen seen when the wings are raised.
Dock Bug Dock Leaf Bug Dock Leaf Bug
The Dock Leaf Bug can be confused with the less common Box Bug but the latter is longer and more slender with a narrower, more patterned "skirt" and different antennae.
Dock Leaf Bug nymphs (young) are shown on a separate page -- see link below.
 

   Links:

Dock Bug nymphs
Dock Bug Nymphs
Box Bug
Box Bug