Have you ever seen such evil worms

After seven years of living in our house we finally plant grass, today Mike notices a spot that is dying so he decides to turn the hose on and water it for awhile when these sick wicked worms start floating to the surface. They are called Japanese beetle grub worms and they are eating my pretty grass. So we are flooding the grass throwing down some grub killer and hopefully the darn things die, if they don't I'm going to pour gas all over my lawn and burn them alive.