Before we get into how to get rid of grubs in your lawn or garden, we should first take a look at what a grub is and why they are destroying your lawn in the first place. Grubs - also called white grubs, grub worms, or lawn grubs - are the larvae of scarab beetles, such as Japanese beetles and June bugs. The basic cycle consists of beetles laying eggs in late summer and fall, those eggs hatching into larvae that burrow into the soil and survive on organic matter like roots through winter and spring, and then the larvae entering the pupal stage and maturing into beetles to leave the soil in late June. Then, after dining on foliage for the summer, the new beetles lay another round of eggs, and the process starts over again. A large grub population can decimate a vegetable garden, flower bed or natural grass lawn, but most serious grub issues that homeowners deal with have to do with their lawns. While a small population fewer than five grubs per square foot of soil is generally not an issue and will not destroy your grass, a population of 10 or more grubs per square foot can cause significant damage.