Depends on what you are going to "treat them" with. The active soil life varies from chemical to chemical.

Honestly some are normal in most gardens so for the most part I'd ignore them chemical-treatment-wise. If you are tilling/turning the soil that alone will take care of most of them.

If you want an organic treatment (allows you to plant right away) look into parasitic nematodes. Inexpensive and very effective.

Dave

I'm not sure that I would worry too much about 'some' grubs. I am curious about what you would treat them with.

I wouldnt worry about them, as long as its not a heavy infestaation, the act of turning the soil will eliminate most (ie, birds and sun exposure) Every garden is going to have grubs, its inevitable,

Most of the grubs in my yard are in the compost pile. I've found over the years, that allowing the "wildlife" clear out most of the grubs first, then sifting the compost, letting the birds finish off the pill bugs, this simple remedy works well.

Get em before you put the fresh compost into the planting areas, saves alot of headache later on.

Bejay

I see plenty of grubs every time I dig, and I toss them out and hope the robins eat them. I don't think they are particularly destructive pests.

I never worry about grubs in the garden, certainly not enough to treat an area for them. I've found that most are Japanese beetles, June bugs or those giant Green June bugs. I've found lots of grubs over the years and never had a problem.

I also toss the Japanese beetle grubs to the robins. Most of them get eaten by grackles and starlings as they rise to the surface of the soil. I actually leave the Green June bug grubs (huge!)because I like the beetles. They have never damaged crops in the areas where I leave them and the grubs only eat decaying organic matter.

Bellatrix

Birds actually follow me around when I'm pottering about outside, knowing that I will toss caterpillars and grubs to them.

Bella_trix,
The Japanese beelte grub is a grass root eater & the beetle eats leaves(small June bug).
The larger grubs eat compost like earthworms, the larger beetle are Green fruit beetle. The green fruit beetle only eat damaged fruit.