A buddy had an issue with mites and sprayed his tent down. Dont have much info on feeding etc… organic soil grow.
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That plants looks line a starving Somalian. Needs every nutrient under the sun
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+ 
= 
toss that mf’er & heat up the tent to 150 for a few hours.
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Peace. I have used neem oil as a spray on my plants to get what I thought was powdery mildew and afterwards they looked a bit burned and sick somewhat like that.(pic is not that great on detail for me). May also have a pH problem IMO. I am not a plant guru, but I have recently went thru similar and got them to pull thru. I used low doses of nutrients and also added garden lime. Suggest that to them. It may help. If they haven’t tried that yet.
Peace
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Toss all soil in the house too. Lightly bleach and put those fabric pots in the dryer.
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That plant is buggered. 
I’m in agreement with Cannabissequoia and Skiball on this one, kill it with fire, sterilize and start over. Your buddy needs to look closely at the soil he’s using…
Cheers
G
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Thanks for the feedback, friends. I agree that the photos make it tough to diagnose and without knowing exact feeding, environment, etc… it’s hard to do anything but speculate
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