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3ma... Sorry to hear bout the situation... all the way around... esp the coppers.
My guess is that you have a few different critters and the likely source is the cuts you are bringing in and to a lesser degree the coir... my mites and springtails came from them... esp if using wet bags of anything. That could also be the source of the gnats... tho those can just fly in thru the door. Root aphids and springtails can also come in wet bags... th soil mites can come in moisture resistant eggs in compressed bales or bricks of both coir and soil. Root aphids are usually gifts from other growers tho. But that's where I'd be thinkin on where and what.
From ur pics though... I'd say it isn't a bug issue... you've got good lookin veg and early flower pics... aphids would hurt you earlier... and ud be able to pic em out. The gnat larvae isn't creating all that damage either... but do indeed gnaw on the roots like dank said... and black heads mean gnat larvae as poopy nailed. Soil mites just aren't doin it... even when they breed by the thousands. Bugs are a reasonable guess tho esp when considering the crop to crop to crop pattern...
I'd check ur runoff first like ptb suggested... will give you an indication if its what dank thought... ph... or high ppm's. It def looks to be a root zone issue effecting uptake. Your veg just looks too good... and the roots are white... don't see the bug issues. What's the feed regiment like?
I could always squeak a decent veg out of my plants, though later in the daily veg light cycle some plants would experience some minor wilting that would be gone by the next morning. By three weeks into Flowering cycle things are just not progressing the way I know they should from experience. The flowers never really begin to "stack" the way they should. Plants pretty much quit using water in a normal fashion. Plants seem to be EXTREMELY light sensitive, to the point where I have to keep them nearly 3 feet from my air cooled 600 so the leaves dont burn up. My room has decent ventilation, and air cooled lights on separate systems. I get the burnt leaf tip and random necrotic patches. Other leaves stay competely green and look somewhat unaffected, but the plant itself has OBVIOUSLY lost vigor ad refuses to grow. Root structure is pretty much non-existant, even though it was gangbusters in veg. I dont even bother to harvest, the flowers are basically undeveloped/immature/tiny even after 8-10 weeks.
This has been impossibly frustrating and to some degree life shattering for me. My only recourse may be a move, but that would be at least 18-24 months into the future.
That's classic root aphid damage in the pics of your plants
NOT GNATS!!!
you have a serious infestation
READ THE ROOT APHID THREAD!!!!
nothing more nothing else.
root aphids are not the same as outdoor aphids, not even the same bug
just because the term aphid is in the name
mm you need to study more
get imid now!!!
root aphids