Governmentchz
Well-Known Member
I have no idea what might be causing that. Only those plants and not others?
Well, the little rust spots have been somewhat consistent and manifest in a way that leads me to believe it's uv damage from the lights. I have a 'beta' set of these lights that had an experimental spectrum and I think it went a little overboard on the uv. Just speculation, but is my thoughts on that. The heavy leaf damage I've shown here is a one-off which is why I'm confounded a bit. I think I cooked the soil a little hot and plan on cutting in some fresh promix at about 3:1 to that bin of soil when I upcan to final pots this weekend.
Observation: I see damage at 3 node levels. 1 leaf below worst leaf is less damaged. 1 leaf above is only affected on tips. This suggests to me that damage occurred in single instance when worst leaf was fully open at top and next leaf was just opening. I'm guessing necrosis took a while after damage to appear. Mild heat damage will appear that way. Leaf section dies slowly and turns black due to enzyme activity. Whatever the cause it appears to be over.
Thanks, I think it's mostly over too. Hoping so.