What can this be?

[BluntFullOfKush]

My plants have been looking good for the longest.. up until sat i would like to say.. It's effecting my plants that's still in veg aswell as my autos that's flowering.. it's been a while since I've grown and I've never ran into this before.. also, it's been a while since I've been on this site so imma try my best to upload the pics.. any input would be greatly appreciated.. #JusBlaze P.S, i added b4 pics also

 

[user 60570]

kill them all

 

[pute]

What is your pH in and at runoff? Cal /mag. You have a deficiency in both cases.

 

[BluntFullOfKush]

Not sure about the run off but my ph is 6.2-6.4

 

[Bubba]

Classic cal mag needed and or PH off. Cal mag really doesnt become available until around 6.6 with soil from what I experience.
sometimes with nutes in water, i can not get basic up/down to get it above 6.4. I make cal mag in separate jug, make sure its PH is at least 6.6, but not over 7. Nute jug is usually around 6.3. Straight RO water is usually 6.5 or so, I will up it if necessary as close to 7 without going over.

This way, when giving nutes, I give cal mag first, then the nutes, the RO water. If they respond to Cal Mag, the dead spots will stay dead, but I have had leaves with a lot of green survive. The dead part, those spots stay dead.

I have had that happen late during flowering, where even the tiny new leaves poking out of colas were getting cooked. flushed with PH'd RO PH'd to no higher than 7 no lower than 6.8 and they made it fine. Great yields as well.

Bubba

 

[BluntFullOfKush]

Appreciate that.. went to the store yesterday and got some cal mag and gave it to them today with no nutes give an update in a couple of days.. by the way I'm growing auto zkittles, dosi, and blueberry kush along with strawberry dog shit (reg) blackberry and tropical punch (both fem)