James, that is one odd looking grub! I have uncovered lots of them, especially the japanese beetle and green june beetle larvae, but never seen a green one. It is kind of cool, used to be mostly japanese beetles, now getting more june beetles which I think means my organic matter is gettting better! They are detritovores, versus the japanese beetles eating the roots.
I wonder if there is a source of copper or nickel giving that color?
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Interestingly enough Tj, there are members of the Scarabeiform family that are white, green (three or four shades of green even) and blue or azure colored.
I can't say whether or not soil mineral content has any bearing on the color of any of the larvae.
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