Bugs on my bean sproots

Some new beans sprooted, and something was chewing on the leaves. I'm finding little maggot like creatures chewing on the bean sproots. On a couple they are turning the leaves to lace. One had it's first true leaves completely consumed. Others I have managed to save by picking them off.
Any ideas as to what these are and some sort of prevention? I have peas started well and some other seedlings sprooting, but they seem to like the beans first.
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