Little gnats flying around my seedlings.

What are these little gnats doing.Are they dangerous to my plants.

No pics but probably fungus gnats...research mosquito dunks for a soil drench.
FF

Roylahey said:

What are these little gnats doing.Are they dangerous to my plants.

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Yes, their larvae destroy young roots.
FF

FastFreddi said:

Yes, their larvae destroy young roots.
FF

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How do I kill them.

Roylahey said:

How do I kill them.

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I already stated that op.
FF

The pertinent question is why are they present? Stagnant, wet, damp, decomposing organic matter are conditions that attract pests.