Lawn Grub Detection “choose one or more of these methods”
A visual inspection of the leaf blade can be an effective method, you will actually see holes or part of the leaf missing like chew marks, in bad infestations there will be very little or no leaf at all to see.
Check under the eaves of your house for furry brown patches these are moth eggs waiting to hatch.
Try parting the leaf blades and look for an accumulation of fresh small green pellets of excrement, these are their droppings.
If there are orange / black wasps “The Ike Newman Wasp” (Leptobatopsis Indica) flying over your lawn, this will usually indicate that there are grubs present, as the wasp is looking for a host to lay its eggs.
Lawn Grub Life Cycle