They look like thrips.
They will multiply madly if you don't get a grip on them and they will hurt your girls.
Spinosad kills them dead.
I've used it at 4 weeks, but would not use it later than that.
Spray the plants (top and bottom of leaves), wait 4 days, repeat, wait 4 more days and hit them a 3rd time.
That way you get them at all stages.
They have several stages, and Spinosad doesn't effect the eggs.
Azatrol works too.