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Fly or wasp with green head and thorax, and yellow and black striped abdomen. Less than a centimeter long.
The insect is a bee - probably a Halictidae.
http://en.wikipedia.org/wiki/Halictidae
Sorry, I know the plant is a New England Aster (Symphyotrichum novae-angliae). Don't know about the insect, but it looks like a bee mimic to me.