Grubs on the other hand feed on the roots of the lawn killing it in late summer. The best method of grub control is to apply the proper insecticide at the proper time. Preventive products such as Merit can be applied in June or early July for best results. Rescue treatments such as Dylox or Diazinon are best applied in mid August just after the grubs hatch. Treatment other times of the year will have little effect on the grubs.
Moles are more common in the late fall and again in the late winter through early spring.
Grub treatments at that time of year are just a waste of money and add unnecessary chemicals to the environment.