Calcium deficiency?

[SUNDOG]

Do any other plants have spots on any of their leafs? Also look for yellowing of the leafs.

 

[Bongzilla]

I need some help here guys. I need to know for sure if this is a calcium deficiency. Seems to be getting worse. Shes in hydro. I give her half the dose of calcium it says on the bottle. I use sensi bloom half dose, and also CARBOLOAD and OVERDRIVE half dose. The buds already look like they're not gonna fill out. They were doing real good till about a week ago, and then I started seeing these splotches on the leaves. Any help would be appreciated. This plant was so healthy before this started happening.

 

[RivetGrrl]

Septoria is normally an outdoor cultivation problem, but anything could be possible. Look for the spots to be greyish-white to brown to start with.
I'm still leaning to a def. but pH is key.
Can you test the pH first though? I would definitely look at that as it can lock out nutrients and cause all sorts of problems.
Let me know please.
Sorry I haven't grown an Auto yet so I can't say how filled out they should be, hopefully someone else can pop in on that.

 

[Waira]

...need more info mate... what EC/TDS, and pH is the res' at? Has that fluctuated much? ....Water source? If tap, pH and TDS/EC of that,... Distance to lights?
...this isn't an infection, it looks like Ca or maybe a micronutrient defc., not hard to get using a dilute feed schedule,... All AN nutes?

... as you see, Ca is already dicey for availability in the so-called optimal range
..as for the bud formation issue, P may be too low,...is there a PK booster on hand?