What's your guess to what's happening here ?

[itchybro]

this popped up this morning & i thought it was a good one for people to try & diagnose
so what say you ?

 

[itchybro]

i should add this is not my grow & i have not done the diagnosis
the diagnosis explanation is very interesting i thought

i guess i should have changed the names on the pics b4 posting

 

[Pedro de pacas]

Evapotranspiration, from too much Climate change, caused by man made Co2

 

[itchybro]

this prob was only happening here

 

[itchybro]

here is dr.nadia sabeh diagnoses


her website has a VPD calculator for canna
https://www.doctorgreenhouse.com/vpd-calculator for Tonatoes Greens & Cannabis

her blog & video on VPD " The Pressure to Transpire "
https://www.doctorgreenhouse.com/blog/vpd-the-pressure-to-transpire

 

[afghan bob]

I woulda said P.H 4 sure going by those zig-zag markings in first pic
So glad i didn't say anything.......or did i ?

 

[itchybro]

don't worry mate i went through a bunch in my head too
PH
light burn
leaf burn from foliar oil spray , then ruled that out cause i saw the plants were flowering