On Jul 20, 3:38 pm, " wrote:
Over the last few days I noticed a lot of chewed-up leaves on the
ground beneath our large 25 foot tree. Upon closer examination I
found the following larvae attached to the leaves, as well as some fly-
looking creatures (not sure if they're related to the larvae).

Can anyone identify the offending vermin? Should I be concerned about
this? What steps should I take to get rid of the infestation and save
the tree?

Pics at the following address:

http://picasaweb.google.com/jseemann/InfectedTree

Thanks!!
Jason

What kind of tree?
First determine the tree species.
Looks like sawflies but the pics are not clear enough on my end.
For sawflies you don't really need to do anything, they come eat a few
branches worth of leaves and move on.