This Jack Herer is in week 12 and I believe almost ready. Harvest except the trichomes are still to me clear oh, but this morning I noticed something that look like sawdust growing on most of the leaves don’t know what this is if somebody can help me out I appreciate it
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Have you checked for bugs?
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Look under leaves for pests as @MidwestGuy 
said. Jack’s dead bug spray can be used right up to harvest.
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Is there any exposed wood above them? That looks like what Carpenter Bees leave when boring into wood.
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Please keep us informed of what you find that to be. 
What is CJDB @Pet_de_Chien
No wood its in my grow tent
That’s some kind of bug for sure. Like mentioned, I’d get jacks dead bug on it immediately, and you’ll have to wash your buds when you harvest, which I do anyways.
“Captain Jacks Dead Bug” spray or any Spinosad containing. If getting the CJDB, get the concentrate and a spray bottle or a little half gallon pump sprayer.
If you try to get a more in focus photo, we can try to tell you what bug it is. Looks like aphid to me, but not 100%
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@Hex CJDB is Captain Jacks Dead Bug Brew.
Ready to use:
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Looks like a massive insect infestation. I sure hope I am wrong.
Okay just ordered the cjdb ill have it tomorrow,should i apray the buds as well?
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I think you can. Just do a wash when you harvest. 
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Thank you all,il keep you posted
Good luck…I have never seen it that bad before. I hope it turns out for you.
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Overnight
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Thanks for the tag @Newt …
I can’t make any kind of determination what they are however could be mealybugs ,if they look like lint …or could be white aphids in which case I would spray them off with water only every day until you no longer see them …if you shake the plant and they jump off and back on they are whiteflies…The CJDB should take care of whatever it is …
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