Help! Blight? Something else?

[Jerrys84]

Hello, My efforts to grow some marijuana have been stymied. My plants were supposed to be autoflower, but 5 months later they are decidedly not autoflower. This is a rooftop grow in a jurisdiction where it is mostly legal. The plants were fine through vegetative state, very lightly fertilized. Lately they have become blighted. I have always had a little dieoff at the bottoms and sort of assumed it was that, but progressed. Maybe 2-3 weeks. I have them on an automatic waterer, and they are in soil bags which drain pretty well. Below are some pictures. My suspicion is rain, which is fairly acidic (recall its an outdoor grow), but they have been outside for months. I do not know if they are salvageable at this point, cause my girls look f*cked. The pvc piece you see is new the other day, pursuing the rainwater theory. Just went into flowering too...

[OldManGrower]

Wow, that is an issue! How hot is it where you live? I don't know but I suspect something with the roots. Check the PH of the soil. Should be between 6-7.

[Tersky]

Are you feeding it now? It looks like it is starving with the yellowing of most of the leaves before dying off and turning brown and crispy. Possibly root rot or ph issues like OldManGrower says as well but the yellowing to me says im hungry. Not sure how to salvage this one tbh as it looks like it is dying. Is your soil airy or compact? Any perlite?. Cannabis likes lots of air to the roots so excessive watering can drown the roots and cause root rot.

[crucialbunny]

Man, that poor girl has been ridden hard and put away wet. I can't even begin to imagine what has caused this kind of damage. Like others have already said, root issues are probably a likely suspect. What's the story with the pot cover? I've never seen that before.

[Rwise]

Clawed leaves are my first clue I have bugs. Look them over with a 30x zoom lens. Can be many other issues, eliminate this one.
How much water how often, to me they look to have been let go dry and wilt, this will cause the leaves to be eaten.
How hot is the root zone, and can you shade it?
I dont know how bad your rain is, I use rain water for my girls with no issues.
The leave tips burned is likely from the soil/feeding being to hot.