What on earth is this...

[xirb22]

Hey y'all,

Could someone please enlighten me and tell me what this could be?

I had these brown spots poppin' up on one of my oldest fan leaves. They worried me but because they didn't seem to spread much I didn't think much of it, but now they are popping up on other leaves as well and as you can see this one leave is totally covered..



I'm thinking it's some kind of pest because of the halos around the lesions and the randomness of their spread.

Please help me out here, I can't find a single pic on the web resembling this so I'm clueless...

Thanks in advance!

 

[chemphlegm]

old leaves are old leaves. if new growth is healthy no worries. when flowering is initiated and fertilizers and plant needs change, older leaves respond this way in my room most often. Just a few here and there, no issues
cut that ill leaf off. roots get old, damaged, plants dont need that leaf anymore, nothing you add would ever change this leaf

 

[Roger A. Shrubber]

calcium deficiency. not a huge thing, a couple of small doses of cal-mag usually clears it up. it happens naturally as the plant ages, it shouldn't be a big problem unless you just ignore it

 

[Dr. Who]

old leaves are old leaves. if new growth is healthy no worries. when flowering is initiated and fertilizers and plant needs change, older leaves respond this way in my room most often. Just a few here and there, no issues
cut that ill leaf off. roots get old, damaged, plants dont need that leaf anymore, nothing you add would ever change this leaf

But it will make a change, by stopping it from advancing!

Follow what Roger said!

 

[chemphlegm]

But it will make a change, by stopping it from advancing!

Follow what Roger said!

he said it isnt advancing.EDIT--aha- it is spreading ! I am mistaken


mine doesnt advance. I can pick the leaf(s) in veg which I suspect will express this way in flower, but it never advances during flower either. If I clip it in veg it wont show in flower. what gives?

 

[Roger A. Shrubber]

clacium is an immobile nutrient, once its absorbed, its where its going to be. if you see signs of cal deficiency, and add calcium to stop it, it won't express in new growth, and the old damage won't advance. if you ignore it, the old damage will get worse, and new growth will slow down, as calcium's major role is aiding in cell division and nitrogen metabolism

 

[xirb22]

clacium is an immobile nutrient, once its absorbed, its where its going to be. if you see signs of cal deficiency, and add calcium to stop it, it won't express in new growth, and the old damage won't advance. if you ignore it, the old damage will get worse, and new growth will slow down, as calcium's major role is aiding in cell division and nitrogen metabolism

I consideren Ca deficiency but I had some doubts about it since it is immobile but it's the old leaves that are affected. That might have to do with the fact I'm a month into flowering, and after some research I did find similar symptoms for Ca deficiency on the web so I'll go with that, thanks!
Do you have any idea why this deficiency results in such strange symtoms? I find the random spotting and strange looks of the spots very unlike a deficiency, I'd expect the browning to be more homogenously distributed, like only at the tips/edges of the leaf or intervenally.

 

[Roger A. Shrubber]

thats where the deficiencies are, those little spots are where there is no calcium first, so the plant can't grow there, the little halos around the spots are areas of lesser deficiency, if you let it go on, the little spots will start to expand and overlap