Spotted leaves

Dont give a shit if its , mites , spider mite, white fly, thrips, or even smurf. You have PEST! Lucky you we didnt burn pested one since 1900. get yourself a potasium base insecticid soap in your local store. (wal mart, lowes, home depot) any fruit or vegetable insecticide will get rid of it. just be sure to take a food grade safe one. spray generosly when suns go down , it must drip from every where, i wear nitril glove and use my free hand to get acces to all the plant, especially under the leaf where those shit hide their egg. 2 to 3 consecutive day treatment should solve your probleme, after that a weekly light shoot will work fine as preventive mesure. to any one who will complain that is not safe.... you should stop eating....

You have spidermites.

The damage on the leaf is reminiscent of mites to me. be it epidermises or the smaller ones broad/russet mites. The thrips should be detectable via the naked eye. In some parts of the photo it almost looks like their might be a mite but can't fully tell as its out of focus when zooming in. A pest none the less. Treat it with something asap or bring in a bunch of beneficial predators into the fold.. I'd also remove any of the heavily affected leaves and burn them then monitor where it is spreading.

It reminds me of an invation of ‘Red Spider Mite’, its real name being Tetranychus Urticae. Unfortunately, you're going to have to cut it all up and throw it in the bin. The first signs appear as early as week 2 of flowering. You're going to have to plan a major clean-up of your growing area and equipment. All the best

when you zoom picture, you could see many poops, black dots. i am 99.9999% sure - its thrips. indoors you could fight, outdoors a bit complicated. harvest will reduce , but far from loss.

pests, most probably thrips. check bottom part of leaf with magnifying glass.