Light Burn(UVB), Magnesium Deficiency, Other??? Man O Green...SOS!!!

[Cerebral Goo]

Anyone recognize what is happening with the ladies? 2 new variables today. Using flora flex and started with the Full Tilt additive today. Also started with UVB today. 4 doses of 3 minutes per hour at 46".
Leaves look like the are taco ish which I believe is too much light. Running 800 PPFD 20/4, but started with the UVB today. AgroMax Pure UVB 4' light which is VERY strong. Wondering if this is too much? But too much just UVB or too much combination of UVB and PPFD???
Also, could it be a magnesium deficiency? It's pretty much in the upper newer growth leaves, but doesn't mag defiency start in the older leaves?

Other?
Seems like it came on suddenly so leaning toward light burn? But what the hell do I know!!!

Getting freaked out!!! A little help please!!! THANKS!!!

 

[GoodSmoke]

Mite's? Looks kind of like early spider mite damage.

 

[Cerebral Goo]

Mite's? Looks kind of like early spider mite damage.

No bugs, that's frost. Resolution sucks on the pics. Too low file size i guess. Not too tech savy...

 

[Cerebral Goo]

No bugs, that's frost. Resolution sucks on the pics. Too low file size i guess. Not too tech savy...

Took a look this am after I got a little sleep and calmed down a bit. Still freaked out though...

It's pretty much on the 2 taller plants and on the top leaves with very slight indications on upper parts of the other plants if at all.

If this was a deficiency, it should have progressed over night no? 6-7 hours...

I lowered the PPFD last night in increments to 700 ish. I also noticed the Photone app will give vastly different readings if the paper diffuser is skewed a bit. I was probably well over 900 PPFD. If the UVB is added, it seems like too much light and or too much UVB?

 

[Cerebral Goo]

Mite's? Looks kind of like early spider mite damage.

I neglected to thank you for your reply and realized it may have seemed snarky. Had just woken up when I posted that. So, sorry bout that and thank you!

 

[Tom Bombadil]

Need pics of the whole plant

 

[Cerebral Goo]

Need pics of the whole plant

Will post some in a few. Need to feed and will take some then. Just getting done with work and need a breather for a moment. Long day at "the office". Thanks!

 

[Cerebral Goo]

Need pics of the whole plant

Hey Tom, here are more pictures of the plant that shows the most issue(s). It's a Mephisto Forum Stomper and the tallest one in the tent by a couple of inches. The leaves of all the plants feel much better today. They were pretty dry and crackly looking and feeling last night.

1)Whole plant
2)View from the top
3)lower leaves and bud
4)Some spotting on leaf tip, there are also some spots like this on a couple of new growth sugar leaves but spots washed out in the light and couldn't get a good pic
5) Red/purple petioles but only the ones that are exposed to direct light(from a different plant, but are on the plant in question as well
6)Taco leaves and "alligator" edges from a different plant but on the one in question as well, lots of leaves curling up at the tips and standing too much at attention.

Sorry if these pics suck but were the largest size I could or know how to send from my phone. Maybe it's light stress and I made it worse with the UVB? a lot of symptoms seem to point to that?...A deficiency as well? Thanks for your opinions!!!

 

[Tom Bombadil]

grow media
humidity
temperature ?

Overall looks healthy... Im not a fan of letting plants dry out, especially in cloth pots even moisture is a better goal imo. Seems like a little light bleaching and that one pic of the spots looks like mild cal def... The leaf serrations curling for me at least, usually indicates slight humidity / heat and maybe even light issues. Next watering check the ppm and ph of the runoff maybe if you have the instruments to do so and see if youre feeding properly

@Mañ'O'Green is the bottled nutes guru and should have an idea about the feed you are giving. Maybe he will pop in!

 

[nizmoKush]

Wrong area thos should be In the infirmary maybe.
For faster and better replys check this out
Problem: (brief description)
-Medium/grow method: soil; soilless-- coco, or peat based like Promix, etc. (please provide the actual product name); DWC, NFT, etc.
-Feed and supplements used: include brand, dosage/strength, frequency of feeding and watering (alone); method-- by hand, drippers, rercirc' or drain-to-waste,... N-P-K #'s too if you can!
-Water source: RO/DI; tap- dechlorinated-?..... EC or TDS reading; pH (don't bother with this on RO/DI, do bother with TDS/EC though to confirm it's working well enough)
-Strain and age
-Climate: night and day ambient T and RH%; res' temperatures; any extremes in T/RH% exposure
- Light used: HID, LED, COB, combo of,... wattage; light cycle hours (20/4, 18/6 , etc.); distance to tops....
-Additional info: How long have the plants been affected?...How fast did symptoms appear?... Anything else you think might be relevant..

--Pictures including WHOLE PLANT PICS, and troubled leaves.. use normal light or flash as other light sources ruin color rendering, critical for diagnostics!