July 7, 2021 - Those ugly white, C-shaped grub worms that infect lawns and cause so much trouble in late summer and early fall are easiest to kill now, when you cannot see them. White grubs are the larval form of the June bug, Phyllophaga crinite, also known as June beetles or May beetles.  Just as a caterpillar turns into a butterfly, grubs turn into those clumsy night-flying June bugs.