Major help needed - WTF is causing this on the leaves?

TL;DR - What is causing this?

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My apologies for the lighting - best I can do. But I think it's good enough to give you the idea.

I've googled marijuana plant problems and looked at leaf pics for days now and nothing is looking like this to me. Or I'm missing it being new.

First 3 pics is of the same plant. Not doing well, but I thought it's because of the plastic pot because the others in smart pots are doing great. Same soil, watering, pH, etc. The only variable seemed to be the pots. It's no where near harvest, but the plant is almost all like this now. It's essentially dead in the next few days and will need to be either pitched completely or dried and used in my Magic Butter machine.







HOWEVER...

Below is my best looking plant out of 5 of the same age/strain/conditions but in a smart pot and is showing the exact same symptoms as of this morning. FUCK! I'm at least 10+ (maybe 20?) days from harvest, I think. I don't know so I included a pic, but I think I'm at least 10+ days, minimum. I'm worried this is going to die too. Two other good ones have one or two leaves like this, so maybe there is time here, but I don't know what's happening to them.

@Beachwalker - doesn't this resemble septoria?

Need way more info, medium, strengh of feed, how often, ph, temps..etc

hotrodharley said:

@Beachwalker - doesn't this resemble septoria?

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Pics I'm finding look just like his first plant pics

What are your temperature highs and lows? What is your RH highs and lows? How are you addressing Ca in your grow? This is where I'd start.

buddy.kindbot.io - AI powered diagnosis app spots signs of calcium deficiency
give it a try with some different photos

CannaCountry said:

What are your temperature highs and lows? What is your RH highs and lows? How are you addressing Ca in your grow? This is where I'd start.

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Temps are between 72-77, RH is between 29-35. They are fed 6.5 Ph'ed tap water. They are in a mix of soil - long story. They are auto's so I only feed them every 4-5th watering at 1/2 strength FF trio.

5 plants total, everything being equal but the containers. The two in plastic pots are doing horrible. One is 90% yellow burn leaves like those and the other is 75%. I figured fuck them, I screwed up those two some how. But the other three in smart pots are actually nice considering my very early problems of cal-mag, etc. All recovered and were great until yesterday or the day before. Now all of the good ones have one or two leaves that are progressing quickly!

@hotrodharley I Googled septoria leaf spots and browsed the pics and found one that looks identical to some of my leaves - both still on the plant and that have fallen off. I think you nailed it my man.