Deadstill said:

That looks like damage from Leaf Miners or grasshoppers, maybe a caterpillar. . Leaf Miners are these little flies that chew parts of leafy greens and take them to build nests. I've seen them in my hemp fields. First time I ever saw them I thought I was tripping. All I could see was a part of a leaf come off a plant and start flying through the air

I wouldn't worry too much about it, whatever it is doesn't look like it's doing enough damage to hurt the plant. You could always try neem or agromagen bio-pesticide for prevention, though, if it gets worse.

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Oldchucky said:

But you do want to get a handle on it before they go into flour. Good luck!

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