I think...I think it's an aphid ( doesn't really matter).....been there. I would cover up soil 1st thing , then try washing/spraying off. If that doesn't do it , what I did was to spray with a slurry of food grade diatomaceous earth ( used for arthropods ) That DE is great shit,
I have a little 1.5gal Chapin sprayer/mister......15$..........if ya do this , ya gotta keep shaking water/DE slurry or else hose will plug.