Grubs can sure mess up a lawn. They destroy all the grass and leave a big brown spot behind. This method surely works. If you can pull up your lawn like a carpet, then you have grub damage. The grubs you find in a lawn are the grubs from Japanese beetles. Japanese beetles are dormant in the winter, and then fly and lay their eggs in mid-July. In August, the grubs start to to move to the surface of your lawn, and while doing this, eat the roots of the grass. The time to treat the affected area...