Identification: What's happening with my beets?

Hi, I'm attaching a picture of the beets that I have growing in my organic garden. Some of the plants are full of little white spots and don't look healthy. Will you please identify this for me and let me know of a solution?

 

Probably Beet leafminer.

 

Thank you for your quick reply. What is the best organic solution for to get rid of it?