These areas are the preferred egg laying sites and are where grubs will feed during the late summer, fall and spring. However, results with these products have been inconsistent and disappointing. Soil insecticides may be used in the late summer and early fall to control grubs feeding near the soil surface. Residual effectiveness of recommended products is low so multiple applications may have to be made. Be sure the lawn is irrigated before treating.
Most chemicals require irrigation after treatment as well.
Follow label directions for application and safety precautions. Thorough coverage of the plant is important. Japanese beetle traps are more effective in luring beetles to an area than they are at actually catching them. They are not considered effective for control unless everyone in the neighborhood has one. Hand picking adults from infested plants and dropping them in soapy water is effective but very labor intensive.