Help! Leafs dying

Opened up the tent to the leafs looking like this today...
Humidity has been running at over 70% the last 2 weeks and have had brown spots forming.
The leafs that are the worst, were solid green yesterday, and all the ones with brown spots are almost as bad.
This look like fungus or something to you guys? Any possible saving?

It appeared to be canna rust, but I'm not sure...
Should I push them further? Defoliate and try make it till harvest? Or chop them now while I can?

Btw, its only the upper leafs severely affected. Some of the lowers are still affected too but not nearly as bad as the uppers
Any possible chance it could be nute burn or something?

Take pics with lights off. Hard to tell what's going on.
What medium are you using?

SH420

Hi Andromeda,
Ya a white light picture would help. But no, I don't see the need to harvest. Certainly that can be cured or corrected. My thoughts are calcium...possibly to excess. Tell us about water you use and any calmag? Just a guess til we get batter pictures.
JD

Here's some of the most severely affected leafs that I pulled off.
I'll take some inside the tent here soon.
I have not used cal mag at all, I use tap water so I figured it wouldn't be necessary. But I have given epsom salts for magnesium.
I have been very light on the feeding. No veg feedings and gave them their first flowering ones just about 2 weeks ago, very light, and the last watering 2 days ago, I gave them their first full dose feed, so that's why I thought maybe nutrient burn possibly.
The brown spots have been gradually getting worse over the last two weeks. Same with the purple/red leaf tips and edges.
All this literally popped up overnight

Actually guys, almost not a single lower leaf is affected..
Anything below the canopy had almost not a single brown spot. As you work your way further up the canopy it gets worse as you reach near the buds

I'm praying that I can manage to make It until harvest.
Everything near the buds are coated thick with trichomes, the buds are super resinous and dense already.
A couple days past 4 weeks in. Suppose to be 8-10wk strain

shrxhky420 said:

Take pics with lights off. Hard to tell what's going on.
What medium are you using?

SH420

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Ffof/coco

Its watering day, so before bed in the next two hours I need to decide whether to give nutrients or to give plain water.

Pretty hard to get help on these forums anymore.
Guess I'll keep guessing and hope I'm making the right choice.

The damage has almost doubled in 12 hours.

AndromedaM31 said:

The damage has almost doubled in 12 hours.

Click to expand...

Ive had good success with a 6.3 ph in ocean forest. How is your range?

AndromedaM31 said:

The damage has almost doubled in 12 hours.

Click to expand...

It doubled? It almost looks like a Calcium deficiency to me.

Do you pH and dechlorinate your tap water? This looks like some chlorine toxicity I just fixed for a buddy.

Andromeda,
With coco you want to feed with every watering (at reduced dose) But then at the end of a grow...not sure what you can do. I suspect your water is fairly soft and plant is not getting enough Ca.
JD

JohnDee said:

Andromeda,
With coco you want to feed with every watering (at reduced dose) But then at the end of a grow...not sure what you can do. I suspect your water is fairly soft and plant is not getting enough Ca.
JD

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Even with a soil/coco mix?
It's about 70% fox farm oceal forest soil/ 30% coco.

a mongo frog said:

Ive had good success with a 6.3 ph in ocean forest. How is your range?

Click to expand...

My ph has maintained about 6.4 throughout everything, but I actually ruined my ph meter recently and cannot check at the moment:/

SCJedi said:

Do you pH and dechlorinate your tap water? This looks like some chlorine toxicity I just fixed for a buddy.

Click to expand...

I aerate for about 24 hours before using any water (should get rid of any chlorine right??)
And I normally ph every time, but I dropped my ph meter in water recently and cant now.
But I have a good idea of what my water generally is, and what I need to use to adjust it. Just been praying for no major fluctuations in my tap water lol

You guys positive this doesnt look like a fungus or mold?
It came out of no where. Everything looked healthy for the most part and then I open up the tent today and I was completely shocked. Didnt realize anything could take over that quickly. And considering my humidity has been running insanely high lately that it had to be a fungus or mold.
If it's not, then I'm not too worried, cause any nutrient problems can be worked with. But I just cant imagine a nutrient problem hitting so quickly. And you'd thing any deficiencies would affect the lower leafs first. Well any of the mobile nutrients. Not sure if calcium is one

If this is an accurate representation of a calcium deficiency, then the plant must have 0 calcium in it because almost every single upper leaf looks like this

Maybe you guys are right..
Only the leafs exposed to light are getting like that, and the ones closest to the light are the most severe...
Just about 3 days ago, I did feed with flower feed. And my flower feed lowers my waters ph so much it's ridiculous (to about 4)
Its organic so its suppose to buffer or whatever, but apparantly it's not.
All these brown spots have showed up gradually, (probably because of the very minor flowering freds I have given)
And now it must have just went crazy because I gave it a heavy feeding which must have dropped my ph down, and took a couple days for the cut off of calcium to hit.
Sound like a pretty sound theory??