If there are fuzzy webs on the under side of the leaves it could be Mexican Bean
Beetles, sounds early though. You can control by just picking them off the plants or use Rotenone dust.
Looks more like slugs on the spinach. Put a board down and pick it up in the AM
to see if there are any under it. Use a beer can, open end 1/2 inch off the ground and they will go in and drown.
Hope it helps.
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