Question What have I got going on?

[JL2G]

This spotting has come about and I'm not sure the cause atm.
It's happening on a couple of plants.
All organic rols.
Haven't checked the soil ph yet, but watering is always set to about 6.2 or close to there.

Primarily in the Altar Bread strain. 2.5 weeks into flower atm.

Thinking it's molybdenum being locked out, but not sure yet. Leaning towards the micro nute side of things being my issue.
Top dressed them a week or two ago with with some fresh mix. Bone meal, chicken poo, alfalfa meal, and seaweed.
It's the same mix all my other plants have gotten.
Hmmmm.......
Tell me your thoughts O' World of Cannabis lovers. Lol.

 

[Deebs]

My first gut reaction is a calcium def, as that is what it was for me when i had something similar in the past.

Cal lockout under 6.2 right, whats your ph?

 

[Deebs]

Too much potassium can also look like a calcium def FYI..thought I should add that...if your ph shows up in range could be too much potassium...if its acidic under 6.2, id say calcium lockout...the roots and stem could probably tell ya a few things if its calcium related...They take a hit on cal def's...

 

[HydroRed]

The leaves look very pale & the petioles look awful purple for such an early stage of flower.
Reminds me of leaf septoria in the spotting and being low on the plant at start. Are all the plants on the exact same feed?

(edit) ok, so I missed the part about the equal feeds for all the plants. Id look into leaf septoria since it is on more than one plant and it can be even more prevalent in plants that have low nitrogen. Considering the color of those leaves, Id guess N is on the low side.
Id recommend treating them with a dose of your favorite fungicide and bumping up the N in the feed.

 

[Capt. C]

This spotting has come about and I'm not sure the cause atm.
It's happening on a couple of plants.
All organic rols.
Haven't checked the soil ph yet, but watering is always set to about 6.2 or close to there.
View attachment 11063
Primarily in the Altar Bread strain. 2.5 weeks into flower atm.
View attachment 11064
Thinking it's molybdenum being locked out, but not sure yet. Leaning towards the micro nute side of things being my issue.
Top dressed them a week or two ago with with some fresh mix. Bone meal, chicken poo, alfalfa meal, and seaweed.
It's the same mix all my other plants have gotten.
Hmmmm.......
Tell me your thoughts O' World of Cannabis lovers. Lol.

Wish i could help but i come to you for advice when i see something like this. I don't know but it seems harder to do a reset when growing organically.Probably what has already been stated about calcium but it looks kinda different to me.

 

[JL2G]

My first gut reaction is a calcium def, as that is what it was for me when i had something similar in the past.

Cal lockout under 6.2 right, whats your ph?

Being the stoner I am, I forgot to add in a couple of pcs of additional info. Lol
Was rushed this am, on a break now.

Me too, I was thinking it may be calcium at first. Gave them a dose of cal mag last watering and no change for the better, actually a bit worse.
I haven't had time to stop and get distilled water for a soil ph check yet. Been super busy with other stuff. Lol.
Being ROLS I rarely check such things.
When the soil batch was originally made though it was a solid 6.5 in various slurry tests.
For the most part I'm a water only grow, with organic top dressings a few times during the plants life.
I pH the water to about 6.2 due to my water having a good amount of calcium carbonate and being like 9.2 before bringing it down.
If I pH it to low 6's it creeps up to around 6.6 ish after a few hrs.
The pH down used is Phosphoric acid at about 2.5 mil per gallon.
Was thinking moly might be my issue due to the spotting, but what do I know? Lol.
I know I'm far from the best grower, but I do ok most of the time. Lmfao. ???

 

[JL2G]

Wish i could help but i come to you for advice when i see something like this. I don't know but it seems harder to do a reset when growing organically.Probably what has already been stated about calcium but it looks kinda different to me.

Me too. Lol.

 

[JL2G]

Too much potassium can also look like a calcium def FYI..thought I should add that...if your ph shows up in range could be too much potassium...if its acidic under 6.2, id say calcium lockout...the roots and stem could probably tell ya a few things if its calcium related...They take a hit on cal def's...

I was kind of thinking that as a possibility also.
To much K locking out/limiting other things.
They did just get a top dress a few weeks ago.
Might have been too much already available. Lol

The leaves look very pale & the petioles look awful purple for such an early stage of flower.
Reminds me of leaf septoria in the spotting and being low on the plant at start. Are all the plants on the exact same feed?

(edit) ok, so I missed the part about the equal feeds for all the plants. Id look into leaf septoria since it is on more than one plant and it can be even more prevalent in plants that have low nitrogen. Considering the color of those leaves, Id guess N is on the low side.
Id recommend treating them with a dose of your favorite fungicide and bumping up the N in the feed.

Yes, they are pale in general, that is another part of their issue. Lol.
Their top dress had soluble, and insoluable N in it, from the chicken poo and bone meal.
Which is what was leaving me kind of WTF on things.
I'll have to look at that septoria thing. I do hit them with neem on a regular schedule if that makes a difference in the analysis.

 

[Smokieokie]

@JL2G is it on older, lower fans or upper newer growth?

 

[HydroRed]

I was kind of thinking that as a possibility also.
To much K locking out/limiting other things.
They did just get a top dress a few weeks ago.
Might have been too much already available. Lol

Yes, they are pale in general, that is another part of their issue. Lol.
Their top dress had soluble, and insoluable N in it, from the chicken poo and bone meal.
Which is what was leaving me kind of WTF on things.
I'll have to look at that septoria thing. I do hit them with neem on a regular schedule if that makes a difference in the analysis.

I wouldnt assume neem to have any bearing on any of this. I would agree with you 100% on the Moly, except the purple petioles and red interveining are telling me something else.
I'll be the first to admit that there are a LOT of folks out there better suited than I am at giving any kind of diagnosis on organic soil issues though lol

 

[Deebs]

Are there any dark specks that resemble black pepper flakes etc in centers of spots? Eyes wiggin out...was thinking possibly septoria leaf spot also or something of the fungal nature

 

[Smokieokie]

@JL2G is it on older, lower fans or upper newer growth?

And also, do the leaves affected feel dry or crispy?

 

[NotAquaMan]

Thinking micros. High soil pH will lock out micros (that has an affect on other nutrients also) and if you have that high of ph source of water im curious to see what the ppm of it is as pH is not a great indicator of the amount of buffering. If it's high I would say you have a buildup of carbonate in the media.

Red on the petioles is usually just from exposure to high light. The purple is not often and issue and most of the time genetics but can indicate a cold root zone temp.

Also what source of ph down are you using?

Root temps?

I would lower the light intensity until ya get it sorted to slow down the progression

 

[JL2G]

@JL2G is it on older, lower fans or upper newer growth?

Mostly older, but progressing upwards.

 

[Deebs]

I wish I could zoom in on your pic lol..is there a yellow "halo" around the spots?

 

[JL2G]

And also, do the leaves affected feel dry or crispy?

Yes on both. Really dry and crispy edges. Lol

Thinking micros. High soil pH will lock out micros (that has an affect on other nutrients also) and if you have that high of ph source of water im curious to see what the ppm of it is as pH is not a great indicator of the amount of buffering. If it's high I would say you have a buildup of carbonate in the media.

Red on the petioles is usually just from exposure to high light. The purple is not often and issue and most of the time genetics but can indicate a cold root zone temp.

Also what source of ph down are you using?

Root temps?

I would lower the light intensity until ya get it sorted to slow down the progression

I have raised the lights a good bit. That's the only thing that's made any difference. Lol.
The plants in question are a good 3 ft from any of the lights.
I did a bunch of water testing last year over the course of a week or two checking things daily at the tap. Was always 8.1-9.2 pH, and was just below 200ppm.
And yes cal carbonate residue gets left behind in a glass if left to evaporate.
Have considered getting an RO just for the grow, but I hate the waste of water. Lol.
I always tell my daughter to not waste stuff. Lol.
I've just been dealing with it as is for yrs now.

Ph down used is Phosphoric acid.
Root zone is low to mid seventies, room temps range from low 70's to low 80's depending on lights on or off.
Rh stays between 40 and 55% on average.

I wouldnt assume neem to have any bearing on any of this. I would agree with you 100% on the Moly, except the purple petioles and red interveining are telling me something else.
I'll be the first to admit that there are a LOT of folks out there better suited than I am at giving any kind of diagnosis on organic soil issues though lol

But your plant reading skills and yrs of growing skills still make any and all of your input valuable. Even if your not a organic soil guy. Lol
I've noticed all of the plants that go under the led's get that purpling on the stems where exposed to the light. Inner growth not so much.

Are there any dark specks that resemble black pepper flakes etc in centers of spots? Eyes wiggin out...was thinking possibly septoria leaf spot also or something of the fungal nature

I'll have to look again, but I don't think there were spots in the spots. At work so I'll have to verify later.

 

[Jewels]

and being like 9.2

This.
This is like being in a relationship with a passive aggressive.
You form an alliance, you agree to compromises, you do your part,,,and the minute you take your eye off it, she is wandering off,,, in a different direction.

Sorry bro,,,you can never trust her, she will never make you happy, she will leave you holding the bag- everytime.

No solutions,,,perhaps suggestions ?
Peat will bring soil ph down.
Sulphur will bring ph down.
Ammonical nitrate will manipulate ph and uptake.
Citric acid ph down, although less stable, adds less tds, and less unaccounted mico/macro's.

That water makes for a tough row to hoe.
Like a bad marriage, never truly rewarding,,,and will last only as long as YOU do all the work.

 

[NotAquaMan]

This.
This is like being in a relationship with a passive aggressive.
You form an alliance, you agree to compromises, you do your part,,,and the minute you take your eye off it, she is wandering off,,, in a different direction.

Sorry bro,,,you can never trust her, she will never make you happy, she will leave you holding the bag- everytime.

No solutions,,,perhaps suggestions ?
Peat will bring soil ph down.
Sulphur will bring ph down.
Ammonical nitrate will manipulate ph and uptake.
Citric acid ph down, although less stable, adds less tds, and less unaccounted mico/macro's.

That water makes for a tough row to hoe.
Like a bad marriage, never truly rewarding,,,and will last only as long as YOU do all the work.

Bang on. And great advice imo

 

[Smokieokie]

Mostly older, but progressing upwards.

I think your right about it being micro. I am leaning towards a manganese deficiency. If it is, just a lil tm7, growers recharge, or similar should fix it in about a week. Damage wont go away but it will noticeably stop spreading. jm2c but I'm wrong alot lol. Good luck, hope it helps narrow it down.

 

[GCG]

Pull the affected leaves. Problem solved.