I photographed this "bug" on shrubs in the garden, can anyone help with identification. Its appearance may be to being a immature form of something other than a bug?
Identified as immature Green Shield Bug. Garden backed by woodland and Green Shield Bugs relatively common. Thanks to all who responded.
I concur - Palomena prasina
I might be entirely wrong but it looks like the Nymph of Halyomorpha halys or the Brown Mamorated Stink Bug. If so, it's an invasive species from Korea and Taiwan. It was accidentally introduced into the USA where it became an agricultural pest. It feeds on a wide variety of plants.
You don't say where you are located
The leg markings on the OPs bug are not those of H. halys; ...and there are other differences:
This is the 4th instar stage of the Common Green Shieldbug - Palomena prasina.
Doesn't look like Palomena prasina to me, sorry. With the shape and pale edges of the pronotum, I am fairly confident that this is Pentatoma rufipes (Forest bug or Red-legged bug) see here: http://www.britishbugs.org.uk/heteroptera/Pentatomidae/pentotoma_rufipes.html
The one pictured here is a Hawthorn Shieldbug (Acanthosoma haemorrhoidale). See here: http://www.britishbugs.org.uk/heteroptera/Acanthosomatidae/a_haemorrhoidale.html
I'm afraid I have to offer yet another opinion on this shieldbug nymph. It is a dead ringer for a nymph of the Woundwort Shieldbug Eysarcoris venustissimus, formerly known as E. fabricii. See www.britishbugs.org.uk