I am tilling up 50 x 100 ft of grass for a vegetable garden and have noticed grubs in the soil. How concerned should I be? And is milky spore the only answer to get rid of them? Also, I cannot afford to fence it in. Are there any ways to detour woodchucks and deer?
Finding a few grubs now in the garden soil isn't too much of a concern.
They have likely done all of their eating and are just hanging out to morph into their adult form.
If you do want to address the issue, you can use beneficial nematodes.
Here are some articles that will help you.