black spots on leaves

[niksnaam]

Hey guys.
Im relatively new to growing. And now i have a small problem.

Its a kalashnikova auto by ghsc under 6 household cfl lights being fed plagron terra line.
60 days in.

I thought it d be smart to throw some ph 6 water in her to level out her ph again.
Normally i just mix nute and tapwater.

Now she is showing blackspots everywhere where its hot.

Is this a temperature or a ph/nute problem?

 

[namvet25]

Looks like cal-mag defieciency to me.Have you used cal-mag?You should ph check every time you water and adjust to 6.5 or as close as you can get.What is your temp at?

 

[Waira]

Nik-- we need more pics please,...from what I can see, the symptoms look like Ca defc., though not the usual ones,... it hit the mid-to upper leaves first and hardest, right? What's the soil pH? Like Nammy says, we need specific info to diagnose,...

 

[niksnaam]

I have no measuring tools.

Normally i chuck in tapwater with some nutes.
Now i tried to level out the ph with bottled water.

It hit the leaves where there is less ventilation.
Almost looks like a burn from the lights.

In the charts it looks like a manganese excess. Could this be solved with a good flush?
I accidentally overfed it by bringing the ph to normal levels.

Could this be the case?

 

[niksnaam]

More pictures and history in my thread at the micro section.

 

[jerry]

fluctuating ph seems to be the culprit imo.i know absolutely nothing about autos but if i was to see that in a grow i immediately would suspect that my root ph has been given a fast boost or a fast decline.if you are using a ph meter id check the battery then recalibrate.

 

[Waira]

hey Nik-- no way it could be Mn tox, that's a micronutrient and unless you're using some weird source of it, levels in nutrients are too low to cause it, so no flushing! ....certainly not light or nute' burn either,... I'm still thinking Ca defc. because it's hitting higher up, and Ca is poorly mobile within the plant, meaning it can't really tap into lower mature leaves for nute' resources to support upper growth,... P defc. presents in a similar way on occasion, though it's mobile, sometimes the plant will pull from close distances to support,... do you have a dedicated Ca-Mg supplement? Apply at full strength for a couple rounds,... what bloom nute's do you have? -let's see what you P input is like,...

 

[Piotrek506]

Hi to everyone, if I ware you I would put my bets on Waira . I think that you running into cal mag def. it is very common so don't wary.
Get some cal mag supplement and use it with every watering. Affected leaves won't get repaired, but check new growth for any signs of spots ...
If you want to prevent it in future try to add dolomite lime to the soil

 

[Piotrek506]

I grow for over 4 years now and just this year I have find out how important is Ca and Mg is to the plants ...
Any plants, including cannabis ...
Good luck mate
(Sometimes I feel like a cal mag representative for weed)