There is a treatment known as 'milky spore' that you put in the soil and it infects and kills the grubs. It's available from a number of sources. It's a bit pricey, but is supposed to last for years. Here's 1 source:

https://www.superseeds.com/collections/pest-control/products/milky-spore-powder-10-oz

Problem with Milky Spore is that it is a living organism and takes a year or more to become really productive. It may not work for a year at all. And then, and pesticides will kill it.

I would remove the grubs as I see them; maybe even put them out for the birds to find.

I was once weeding the asparagus bed. I would toss the grub away, and found that I had the robins lined up waiting for the next grub to be tossed so they could feed the chicks. After that I would put the grubs in an old pan and let the birds take them at will. The pan was always empty.

Same here Kate, as I shovel up a row to prep for planting I'll collect the grubs and feed them to my hen. They're mostly Japanese beetles and Fig beetles grubs around here.

Yep, just remove them as you find them and destroy how ever you will. Most likely they will hatch out as adult beetles of some sort in early summer.

Milky spore should be applied in the late summer or early fall for best results and will last for several years. I cut down on my population of Japanese Beetles by about 90% when I used it a few years ago. Yes, pricey but worth it IMO.

I collect them when digging as well. The lizards here love 'em.

You know, Jack, You made me think about putting down Milky Spore next Fall in my new rose bed. There are large pebbles all over the ground and there won't be any digging to find the Japanese bettle grubs. I didn't think about using it there.

So they won’t hurt my plants if I don’t get them all out?

Not until they hatch if they are Japanese beetle grubs, then they will devour many different plants but they have their favorites.

True! They seem to like yellow roses best. I've been picking them off daily putting them in soapy water to die. I think that if I can get them while they're little maybe they won't get big.? (Probably wishful thinking on my part.)

Kate - they definitely won't breed if they are in soapy water! Just don't leave them sitting in soapy water for more than a day or 2 or they will start stinking to high heaven! Been there, done that.

The pheromone traps work well on JBs but it's best to put the traps a good distance away from the plants you are trying to protect to draw the JBs away. My neighbor puts out several traps every year but they are ~100 yards away from my garden.