Thats ah good doggy, does he or she have his or her booty's on?
Russet mite damage brotha
Pretty sure it takes 100 X scope ta see their lil microscopic asses Shcrews......Gladta see yas back BTW....
Attack this problem with EXTREME prejudice and find out what`s causin it with NO guesswork , or risk infestation in every plant till they can`t come back from treatment....
my complete program = plant seeds, water, harvest..That leaf mutation could be any number of things. Would be difficult to tell from just that one picture, escpecially without knowing your complete program.
Diggin in the rootzone`s where they`ll be noticed first bro.