Control may be necessary if twelve to fourteen grubs per square foot are found in an actively growing lawn. If the lawn is dormant or less than active or dormant, fewer grubs may be needed to cause noticeable injury to the turf. Chemical controls must be watered in to place the chemical in the area that grubs are located. Check the current University of Illinois Urban Pest Management Handbook for recommendations. Make sure to physically locate grubs in the turf before applying chemicals.
Grubs frequent the best looking lawns, which tend to be more suitable for egg laying.
Copyright 1995 by the Board of Trustees of the University of Illinois. The information provided is for educational purposes only. References to commercial products or trade names do not constitute an endorsement by the University of Illinois and do not imply discrimination against other similar products.