White grubs are the destructive larvae of the June and Japanese beetles. They feed voraciously on the roots of your lawn as well as garden plants. If you have sunken, dead patches in the lawn that when grabbed come away with no roots, check for grubs feeding in the healthy lawn adjacent to the damaged area. They are easily identified by the whitish curled larvae that has a cinnamon coloured head. The safest method for grub control is to spray the lawn with beneficial Lawn Guardian nematodes when grubs are young and actively feeding in early fall. Spray again in early spring to catch any grubs that over-wintered in the soil.

Video: How to apply nematodes.