Brown/dark spots spawning on every leaves

So I've had some problems during my last grow, and my current, as I thought it was bad genetics or bad seeds earlier.

Now I'm on a new grow 5 weeks into flower and it's starting just like last time, at first there's just a few spots here and there. (Happens midstage flowering) The spots spread with air it seemes and continue attacking every leaves until most of the leaves are totally crispy and breaks on contact.

On my previous grow I got myself a ph pen to check the runoff. It was 4.3 so I figured the ph pen was broken and ordered a new one, which I recently got.
So to get it right this time I calibrated it as instructed and checked the ph on my current grow.
I gave it tap water with ph of 8.2 going in and the ph runoff was 4.2.
I figured I'd flush the soil with 3 times more water than soil, the ph increased a bit but was still below 4.5 so I started considering starting all over.

After a lot of research and reading I figured I get dolomite lime and spread it on top of the soil. Hell i even mixed a bottle of water with it to make sure it drained as much as possible into the soil.
I used a lot more than what people recommended, cus I figured it was hard to overdose dolomitelime. This is now 4 days ago and the spots keep appairing on new and old leaves. (Also, should I remove these leaves? Cus I currently do incase it's an fungI infection that spreads with airmovement) and I'm thinking what the f** can I do now.

I have a plant (sativa dominant) which has a lot more nitrogen in it, even showing a few claws. This plant is the only one not (yet) affected. At least thats what I think because she doesn't have any spots yet. She's also way greener(darker green) than those affected.

I am using a 600w hps, soil (70%)with a mix of perlite, Coco(20%)
No magic soil with fanzy name.
Next time I'll be mixing in dolomite lime
I feed with Advance nutes ph perfect, every other watering. 12 litre pots.

Here are some pics to help you guys help me, cus I can't seem to fight this without any guidelines.
These leaves are picked from different places of the plant. Some from below, others from middle to top. Also, 10 days ago, my plant had 0 visible spots.

In everyway, endless thanks to those able to get me on the right tracK!


The pictures above are 60x zoomed, was kind of hard to not get any blur.

Bump

Leaf Septoria is what it looks like to me

calcium def prob cuz ur PH is way low. May want to try a different soil, something is WAY too acidic

It can be both leaf septoria or/calcium def, but I'm hoping it's only a caldef.
I've been sprinkling my top soil with dolomite 2 waterings, plus added an extra layer of soil with dolomite mixed in it. Had some roots showing at the top.

It seems the ph is stabilising, but I'm not sure about this, will check runoff again on next water.

One of the plants seems to have the "desiese" in check, I see no more spots, but lower leaves are now yellowing a bit faster than expected.
Also the N-rich plant mentioned above still show no sign of spots/yellowing.

Late stage it will look exactly like this photo I found on google:

And last thanks for your reply, I will do some experimenting the next days and hopefully I'll even save my harvest. Wouldve been glorious!

not sure how your soil ph got so low, but thats bad cal. deficiency because of it. needs to be 6.2 or above to absorb cal.
whats the ph of your nute solution when you pour it in?
also, not sure if coco is a good thing to add to soil, even at 20%. they have very different properties and ph requirements

I put in Coco to make the water drain better. The soil tend to stay wet for to long if I don't mix it. I should probably just discard it but first I want to see if I can fix this. That would save me a lot of money.

My ph going in when i feed is 6.4.
I feed every other watering. When I do not feed, the water is 8.2 going in.
The runoff ph is about 4.5 regardless of feed or plain water. I may be able to check the ph runoff tonight. I do believe the runoff ph has risen a bit, but the lights are out now so I'm unable to see if they need water. I'll keep you updated

what soil is it your using ? maybe when u go in you could take some whole plant pics so at least we can see the plant the soil its in and ur conditions a bit more sure a leaf pic tells you something but a whole plant pic could spark a whole lot more in someones brain as theres more to look at like where the leaf problems are occurring and such good luck

I am using normal potting mainly for tomatoes. Good soil made for cannabis(fox farm etc) is hard to come by in the northern Europe where I live, and those selling it have overpriced it more than what the medical industry(pharma) would do.
I need to keep it as cheap as possible when it comes to medium, because the alternative is either way expensive or never ever mentioned in any cannabis forum online.

I will not be able to check the ph today, still moist. The spotting seems to slow down drastic, I was expecting a lot more spots than what I saw just now when lights got on.

However, I did get some pics showing more plants and envirement. Hope this helps and thanks!


As I'm not able to move the plants to a normal lighted area, I held my Lumiii glasses in front of my camera to get a clear/white light color.

Ivers said:

I put in Coco to make the water drain better. The soil tend to stay wet for to long if I don't mix it. I should probably just discard it but first I want to see if I can fix this. That would save me a lot of money.

My ph going in when i feed is 6.4.
I feed every other watering. When I do not feed, the water is 8.2 going in.
The runoff ph is about 4.5 regardless of feed or plain water. I may be able to check the ph runoff tonight. I do believe the runoff ph has risen a bit, but the lights are out now so I'm unable to see if they need water. I'll keep you updated

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Coarse sand is your fix for poor draining soil. Run-off 4.2, tap water 8.2. Get rid of the soil you are using and start fresh. Make a soil profile on the new soil, I have posted how to do this several times recently, look it up. Get good water (rain). GET YOUR SOIL RIGHT b4 adding beans. Get a ppm pen ( My tap h2o is 8.4 and 374 ppm, suspect your's is similar, a plant can't thrive with that ). Read, read, read. Good luck

A.K.A. Overgrowem said:

Coarse sand is your fix for poor draining soil. Run-off 4.2, tap water 8.2. Get rid of the soil you are using and start fresh. Make a soil profile on the new soil, I have posted how to do this several times recently, look it up. Get good water (rain). GET YOUR SOIL RIGHT b4 adding beans. Get a ppm pen ( My tap h2o is 8.4 and 374 ppm, suspect your's is similar, a plant can't thrive with that ). Read, read, read. Good luck

Click to expand...

It doesn't rain much here, only in the summers. Can I collect and melt ice/snow as an alternative? I do have a tds meter somewhere, but I've never looked into ppm and in what range it should stay in. Still in a huge learning spike, just recently figured all this ph thing and how important it can be.
I've been growing autos that usually would've been done already, so this problem never struck me earlier.

I will look a lot more into soil and hopefully know more on how to get a good soil mix til my clones are ready.
Coarse sand is next topic for me to investigate, thank you!

Soil was dry enough to water today and I got alot better results testing the runoff.
With some variation, the ph has risen to 4,9 - 5,1.
They all had below 4.5 when I first tested, so I am sure I'm somewhat on the right track!

The plants I've given lower amounts of lime to has lower ph runoff, so the more lime the better at this point. I will keep sprinkling my top soil to hopefully make it more evenly mixed into the soil each time I water, until ph peaks or get in range.
I'm probably good from here on out, thanks for your effort.

Ivers said:

It can be both leaf septoria or/calcium def, but I'm hoping it's only a caldef.
I've been sprinkling my top soil with dolomite 2 waterings, plus added an extra layer of soil with dolomite mixed in it. Had some roots showing at the top.

It seems the ph is stabilising, but I'm not sure about this, will check runoff again on next water.

One of the plants seems to have the "desiese" in check, I see no more spots, but lower leaves are now yellowing a bit faster than expected.
Also the N-rich plant mentioned above still show no sign of spots/yellowing.

Late stage it will look exactly like this photo I found on google:

And last thanks for your reply, I will do some experimenting the next days and hopefully I'll even save my harvest. Wouldve been glorious!

Click to expand...

Don't check runoff. It will make you chase your tail. Take equal parts soil and deionized water and test the slurry. Things like salts and other things will make runoff ph inaccurate.

Get ffof soil ph is good.