Pest
Leaf minerBrown blotches on chard and beets leaves

Pale brown blotches on the leaves, where tiny grubs feed inside.
When it shows up: Spring and summer
What to do
Pick off affected leaves.
Squash the grubs in the blotches if you see them.
Cover young plants with fine mesh in spring and summer.
Not quite it?
These look similar. Compare the photos.

