Calcium Deficiency?

So last week I noticed early signs of a nitrogen deficiency and this time it looks like a Cal deficiency?

NOTE TO SELF:
If vegging plants 3 weeks longer upping my pots by 2 gallon is not nearly enough.... (I normally don't have to feed at all during veg).

What do you all think, early Cal deficiency? Mostly on older leaves middle to upper area of the canopy.

Grow:
4x Lilac Diesel RBX2 (ethos)
2x Birthday Banger (cannarado)

FFOF (80%)
Biochar (10%)
Vermicompost (fresh) (10%)

Supplemental Feeding:
Mykos
Roots Organic Terp Tea Bloom
Sensei Cal/Mg Xtra (about to start feeding this regularly)
Compost tea (kelp meal, terp tea, vermicompost, misc.)

Pesticides used:
BTI (mosquito bits)

Week 4 Day 6 flower

It kind of looks like all the affected leaves are touching or are in close proximity to each other which would make me consider infestation. If that were ruled out, I would consider that may be another sign of too much of something because every tip I see is singed so there’s definitely a over abundance of something going on already. I’m guessing you have used some cal mag since you plan to start regular use, which would make me lean away from cal deficit. Good chance it’s a weird symptom of nute burn if your tips are burned and you’re still feeding the same amount of stuff. just my opinion.

Can your scratch the rust off the plant's leaves? If yes, that is most probably "Rust fungus". I've never had it so I can't tell you anything Google wouldn't though.
Good luck

have you concidered giving the ocasional dose of seaweed solution? include it in your usual feeding program, it will stop any plant deficancy's you might encounter along the way. great for the plants vigor too.

if its a calcium def, then your soil ph may be out of wack, that would stop the plant from absorbing nutrients called ph lockout.
thats the only reason i can think of as your feeding cal/mag

i dont think its rust, butwait for someone else to chime in if its a rust or other def andwhats causing it

Redskare87 said:

It kind of looks like all the affected leaves are touching or are in close proximity to each other which would make me consider infestation. If that were ruled out, I would consider that may be another sign of too much of something because every tip I see is singed so there’s definitely a over abundance of something going on already. I’m guessing you have used some cal mag since you plan to start regular use, which would make me lean away from cal deficit. Good chance it’s a weird symptom of nute burn if your tips are burned and you’re still feeding the same amount of stuff. just my opinion.

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Totally could be nute burn- I was encountering some nitrogen deficiencies and had to change up my feeding regimen but I don't have anything pure nitrogen so who knows what levels I could have gone over on.

It's not just touching leaves- it's on all of my four biggest plants on opposite corners of the tent but not on either of the shorter plants in the middle.

go go kid said:

have you concidered giving the ocasional dose of seaweed solution? include it in your usual feeding program, it will stop any plant deficancy's you might encounter along the way. great for the plants vigor too.

if its a calcium def, then your soil ph may be out of wack, that would stop the plant from absorbing nutrients called ph lockout.
thats the only reason i can think of as your feeding cal/mag

i dont think its rust, butwait for someone else to chime in if its a rust or other def andwhats causing it

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I don't use seaweed solution but my compost tea does have kelp meal in it.

PH lockout could be a thing however I've NEVER tested/Ph'd my water in years of growing at the same location without issues. @RadicalRoss is in the same city and said his Ph was pretty off out of the tap. Dolomite lime normally buffers it enough for me though.... (and now that I think about it that's pure cal/mag).... my original schedule has them just getting plain dechlorinated water w/molasses the next couple feedings anyways... I'll probably just watch them and see if it gets better (gonna have to get a Ph meter/testing kit since I've never bothered).

I was thinking cal def because the rust spots are localized to the veins on the leaves themselves and just over halfway up the canopy.

Oh yea, that would have been good to note before- I have 6 plants in the same tent. Only the tallest 4 (lilac diesel) are affected. No signs of light damage, my LED is 14" above the top of the tallest bud. All 6 plants get the same nutrients and water.

Going back through my notes, it looks like our city water already tests a little high on Ph AND I was dosing with Cal/Mag so I probably just caused it to go super base.

SpawnOfVader said:

Oh yea, that would have been good to note before- I have 6 plants in the same tent. Only the tallest 4 (lilac diesel) are affected. No signs of light damage, my LED is 14" above the top of the tallest bud. All 6 plants get the same nutrients and water.

Going back through my notes, it looks like our city water already tests a little high on Ph AND I was dosing with Cal/Mag so I probably just caused it to go super base.

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Are you running your light at 100%?