This does indeed look like thrips.
This person also had a question that looked just like that.
growdiaries.com/grow-questions/49858-there-is-some-white-thing-on-it
I would treat the plant with some BTi asap, or soapy water and rince if BTi is not available. But this will need to be done continuity till a new method is used.
BTi is a bacteria that kills the thrips and other pests from the inside out. its inside some common products, one called mosquito dunks. Once they take a single bite they begin to die. Its a great product and can be used in all stages of the grow. germination to harvest.
One other option is predatory mites from a grow store. I have used them before and they work well. but more of a preventative thing vs a cure thing.
Best Of luck!
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