If grubs are a problem in your lawn (more than 5 per square foot), timing is of the utmost importance for applying a control. Beetles usually appear in late June through July and the beetle larva (grubs) is the early result of that breeding cycle.
It is important to time the application of a control to this breeding cycle. Beetles like a moist, green lawn to lay their eggs in, unfortunately. So they most likely will search out these lush lawns and that may be yours if you’ve done everything right.
The egg laying generally occurs in mid-August, give or take a week, and it’s important to apply control during a two-week period when eggs are laid and grubs are small. Once grubs grow larger they are much harder to eliminate.
Applying control earlier or later than August will have significantly poorer results. Merit and Grubex are two of the most popular products presently being used for this type of control.
Tom Yoder is a Master Gardener and can be reached at firstname.lastname@example.org.