White grubs, the larval stage of beetles, come out of the ground in early June and return back into the ground in August. It is at this time when they return back into the ground that they do their destruction by feeding heavily on grass roots before they barrel deeper into the ground. Late August and throughout September is the prime time for grub damage. We treat for grubs late May thru Mid-July typically during our 4th lawn care treatment, which provides season long control of grubs.
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