Sudden black spots and dying leaves - but not on entire grow. Very confused

pdgenoa

pdgenoa

Member
Some time in the past week these black spots suddenly showed up. They're causing the affected leaves to dry and become crispy wherever the dark spots occur up to and possibly on the buds.

This is my fifth crop with very little other than equipment changing and that's been two crops ago. These are photoperiod Blue Dreams and Northern Lights in soil. Lowest level nutrients (Fox Farms Big Bloom).

There's side by side pics of perfectly healthy buds next to highly damaged ones and the damage doesn't appear to have affected anything below the top leaves - as can be seen in the images.

At first I worried about a disease or fungus but I see nothing matching this when I search.

It reminds me of how my plants looked when I accidentally sprayed 409 near a crop a couple years ago but I can't think of anything that's been near these that would have done that.

I'm not ruling anything out though. Any help or advice is appreciated.
 

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Moflow

Moflow

Well-Known Member
How long in flower?
What medium are you growing in?
What nutes are you using? Are you pHing?
The plants look hungry for a stronger feed to me.
Maybe flush them through with plain water and up your feed strength.
 
pdgenoa

pdgenoa

Member
Moflow said:
How long in flower?
What medium are you growing in?
What nutes are you using? Are you pHing?
The plants look hungry for a stronger feed to me.
Maybe flush them through with plain water and up your feed strength.
Click to expand...
As I mentioned in my post these are photoperiod Blue Dreams and Northern Lights in soil. Normal level nutrients (Fox Farms Big Bloom).

Someone also asked if I checked for bugs under the leaves but they're clear.

And I should add this is a carbon copy of my first grow of the year with the same strains, same setup, lights, feeding schedule etc.

They're approximately 3 weeks (max) from harvest based on the trichomes - which I check with a scope every other day. Also my Ph is steady between 6.5 and 7 but of course I check against the runoff. It's a little tricky though because the gnatrol I use makes it hard to measure sometimes.

I'm really baffled by this.
 
Moflow

Moflow

Well-Known Member
pdgenoa said:
As I mentioned in my post these are photoperiod Blue Dreams and Northern Lights in soil. Normal level nutrients (Fox Farms Big Bloom).

Someone also asked if I checked for bugs under the leaves but they're clear.

And I should add this is a carbon copy of my first grow of the year with the same strains, same setup, lights, feeding schedule etc.

They're approximately 3 weeks (max) from harvest based on the trichomes - which I check with a scope every other day. Also my Ph is steady between 6.5 and 7 but of course I check against the runoff. It's a little tricky though because the gnatrol I use makes it hard to measure sometimes.

I'm really baffled by this.
Click to expand...
I've never used that product Big Bloom NPK 0 0.5 0.7

I use a Biobizz light soil mix
Any basic bloom nutes I use have an NPK of 4. 3. 8. - tomato feed or
AWA Atami A + B NPK of 5. 4. 10 or Doff tomato feed NPK 2. 2.5 4.5
All have a bit of nitrogen.
I just feed at an ec in the range of 0.9 - 1.1.
I don't bother pHing in soil

I've also used AN Overdrive NPK 1 5 4 on occasion but only near end of flowering.

Do you use an ec, tds meter to measure feed strength?
 
Moflow

Moflow

Well-Known Member
I've got that fungus on one of my roses as we speak.
I would sometimes hit it with roseclear ultra.
 
TacoMac

TacoMac

Well-Known Member
Believe it or not, bleach can work as well. Bleech wont kill a plant. It drops the PH like a freaking rock, but with outdoor plants that corrects itself in a matter of a couple days.

When I pressure wash the house I use pure bleach as a soaker and I'll nail the rose bushes in a preemptive strike. Granted, you're not going to want to do that with anything you're going to ingest, but for everything else, go for it.
 
Cx2H

Cx2H

Well-Known Member
They look horrible(sorry), you may be chopping some early. Some bud is better than none.

My rule is if the issue hits the sugar leaf area and don't stop, I chop. Better than dead crispy buds.

3 weeks out isn't much time to fix and recover.
#IMO
 
TacoMac

TacoMac

Well-Known Member
Cx2H said:
Some bud is better than none.
Click to expand...
Not when it's infected with fungus. Never use that shit for anything. Mold, you could at least get away with making edibles like oil or butter. Fungus, no way. It's garbage.
 
Cx2H

Cx2H

Well-Known Member
TacoMac said:
Believe it or not, bleach can work as well. Bleech wont kill a plant. It drops the PH like a freaking rock, but with outdoor plants that corrects itself in a matter of a couple days.

When I pressure wash the house I use pure bleach as a soaker and I'll nail the rose bushes in a preemptive strike. Granted, you're not going to want to do that with anything you're going to ingest, but for everything else, go for it.
Click to expand...
#Off topic. You use bleach to wash the house? It doesn't fux up the landscape?
I need to clean my house but was thinking laundry liquid maybe.
 
TacoMac

TacoMac

Well-Known Member
Cx2H said:
#Off topic. You use bleach to wash the house? It doesn't fux up the landscape?
I need to clean my house but was thinking laundry liquid maybe.
Click to expand...
Nope.

Mother earth is very capable of shrugging off the PH spike in less than a couple days. I use regular old Clorox Bleach from Walmart. It typically takes about 4 gallons to do my house. (It's two stories with a full basement, so it's two stories on the front side but three in the back and sides.)
 
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