I've found a few in my kids' pool this week but haven't checked any of my plants yet. I'm sure they're there. I can't remember when they showed up last year.
Does anyone know when they start laying eggs?

I have them on a couple of roses. So far have drowned maybe 20. I may try Sevin spray if they get too bad. What is really scary is the hordes of tiny grasshoppers that are eating the flowers horribly.

Hope you manage to get rid of the bugs. I thought about wishing you'd keep them up there as we don't have grasshoppers so far this year as we've had before. But i don't want you to have them either.

I remember how much chickens love grasshoppers.When i was little i'd catch them from grandmothers veggies and flowers and give them to the chickens.
vickie

It seems like Japanese Beetles lay eggs in July and August. They burrow into the soil and overwinter as grubs to emerge in June the following summer. Here's a link from the University of Arkansas Cooperative Extension on JB that should be helpfull. http://www.uaex.edu/Other_Areas/publications/PDF/FSA-7062.pdf

I can add that they are breeding now! Saw several mating pairs yesterday so I am thinking soon eggs should be laid.