Most of the grubs are in the third instar by late-September and by October they dig deeper into the soil to overwinter. The grubs return to the surface in the spring as the soil temperature warms, usually in mid-April. The grubs continue their development and form a pupa in an earthen cell 1 to 3 inches in the soil. Cultural Control - Hand Picking By noticing when the first adults arrive on a property, you can pick off and destroy these scouts that attract additional pests. They can be destroyed by dropping into a container of soapy water.
Several traps using a floral lure and sex attractant are available.
These traps are not recommended for general use unless special conditions can be met. In most urban areas, traps tend to attract more beetles into the area than would normally be present. In this situation, adult feeding and resultant grub populations are not reduced. The adults can be controlled by spraying susceptible plants with insecticides. During the heavy adult activity periods, sprays may be needed every 5 to 10 days.