This is a relatives plant and actually all the plants are showing some sign of this
Inside grown in soil.
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I’d be checking for spider mites… Looks a little ate up
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She said she did cuz that’s what I said.
Mites, it’s if they’re in veg spinosad, rosemary oil, or neem oil, spinosad up to early flower really, mid flower on you’re pretty much limited to citric acid based stuff
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This looks like thrip damage to me. With that much damage there should be lots of webbing if it were two-spotted mites and twisted growth if it were russets.
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Ya I was afraid of that. Thank you so much!!
No sign of Thrips either. No webbing.
second for thrips
the little black specks are a telltale sign
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I’m in agreement with @herojuana.tom on his one and by the amount of visible damage, you may have a thrip infestation to deal with.
Spinosad will deal with them quickly and efficiently. Make sure to spray both the top and underside of each leaf thoroughly for best results.
Soapy water may also be used to spray plants for thrips with success. Mix one tablespoon of liquid soap (or 4-5 tablespoons per gallon) into a quart of water, shake we’ll and use immediately.
Looking at the leaf pic you posted and seeing the silvery/white specks covering the leaf surface, it’s an obvious sign of thrip damage. Thrips feed at night and hide during the day.
Thrips, as well as spider mites, like hot and dry conditions and will multiply quickly when conditions are just right.
Tell your friend to get some yellow sticky traps… might as well get some blue ones too. That will let you know for sure what type of flying insects are in the grow area around the plants.
Yellow attracts most flying insects, including a few that are not good for cannabis, like aphids, white flies, fungus gnats and others.
Blue attracts leaf miners and thrips mostly.
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I will also say thrips. That is rasping damage, not piercing damage.
This video is a good one all about thrips.
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Plants were thoroughly searched by two people and nothing, no sign of bugs. So weird
They are very tiny and hard to see with the naked eye. How good are your friends eyes LOL oh yea and they are fast.
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They used a magnifying glass.
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Strange, does this happen on the entire plant or just in some leaves? 
If it is the last option I would discard pH disorders or deficiencies and second the thrips theory, they’re not easy to see and they usually don’t wait for you being ready with that loupe … 
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I agree that it looks exactly like thrips. But you’d think they would have been spotted at some point. I’m not there so I’ll update if I get more info. I really appreciate everyone’s input.
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Looks like mites.
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Entire plant I think
@TestOfOath showed me I had them. I seen the spots. I thought no way bugs. Felt like us was lock out. I was using a 30 times magnifying glass I couldn’t see anything. But 60 showed me it was mites. I think I got mine from old dirt. It was only on a few. I used alcohol mix with water. And then I stepped it up with stuff like cinnamon oil hot stuff. It killed them.
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