Grub worms eating beets!

We discovered today that grub worms are eating our beet roots. I couldn't say what type it is but according to an internet search it seems like it might be from the June Beatle.

My #1 goal is self-sufficiency so having to purchase something from an outside source every year isn't ideal but I guess that's better than continued damage.

Can someone recommend a good solution?

Don't know for sure about root grubs, but I've gotten to a point where I will not plant beets without planting marigolds with them.  Everything eats beets!  And they eat beets before anything else in the garden!  Leaf borers are the worst on my beets, usually.  But when I have marigolds right in there with em, my beets generally do very well and are bug-free.  I scatter marigold seed wantonly around my gardens every year and encourage them to go bonkers.