What are these bugs

[onlyinred]

I am growing horseradish. 4 roots in 4 porous bags. The root grow leaves. I prune the leaves until only the biggest one remains.
Right now, 3/4 leaves are drooping,have holes, and the soil beneath them has flies.

Can you help?
What are these flies. Are they causing the damage. And how do i get rid of them?

P.s i added 3 pics of uust the plants. 1 to show you the healthy leaf vs the droopy leaf.
And the other 2 for size reference

And of course i have pics of the flies themselves.

Thank you.

Side note: the soil is wet.

 

[Meadowlark]

Welcome @onlyinred

The most likely answer is root maggot flies. Another possibility would be fruit flies although less likely as the root maggot flies are known to prefer horseradish.

Like you, I grow horseradish in a container, but I don't prune leaves like you show even though that seems to be the standard approach...but I don't have the root maggot flies either.

Keeping the area free of any decaying plant material can help. I have heard that bringing in beneficial nematodes can also help. If it were mine, I think I would try treating with a little wood ash in a shallow trench around the plant.