Never seen anything quite like it, on any type of plant ....
May I ask - where are you located ?
You might try insecticidal soap (be sure it contains fatty acids) ....and spray the leaves, under leaves, stalk, caudex and the top surface of the potting medium .....then do a repeat spray in a few days
might add ...your containers need to drain almost as fast as water is applied
If nothing changes after spraying - No offense, but If I were in your situation ...I might all start over .... new seed, new containers, new potting media
