Yellowjackets and paper wasps are important beneficial insects owing to their need to provide protein to their legless, helpless larvae in their nests.  I once watched yellowjackets totally decimate a colony of redheaded pine sawflies (Neodiprion lecontei) with the sawfly larvae being carried off one at a time to become meat items for yellowjacket larvae.  From late-spring through the summer, the ever-expanding numbers of yellowjacket and paper wasp workers keep busy enlarging their nests and foraging for caterpillars, sawfly larvae, and other soft-bodied insects.  They use their powerful mandibles to grind-up these protein-rich meat items to feed to their larvae so they will development into new adults.

Click Here For More