What deficiency or problem is this ?

[CleanHerb]

Trying to figure out the issue with my plants.

The problem started out as light green/ yellowish fan leaves at the “top” of the plants. Its quickly progressed to brown spots on the fan leaves – Fan leaves on lower part of plant look pretty much green and healthy.

Also the Top portion of stems are turning completely purple. And the Leaf petioles are purple as well.

The plants are in Happy Frog Soil with a little extra Worm Castings added.

They are being fed with Earth Juice Seablast Bloom nutes and 3ml per gallon of Botanicare cal-mag. – I PH adjust the nutes to 6.5 then hand water.

I fed at 700-800 PPM’s first couple of weeks. Just bumped it to 900 PPM’s last couple of waterings.

The plants are under Gavita Full Spectrum LED lighting and in week 4 of flower.

Can’t figure out what’s going, any opinions would be greatly appreciated.

 

[CleanHerb]

Anyone seeing this ? - Still no replys .......

 

[GNick55]

well i’m quickly giving an opinion before researching..
incorrect ph?
leaf septoria?
air flow exchange good?
humidity too high?
dirty grow space?

 

[CleanHerb]

well i’m quickly giving an opinion before researching..
incorrect ph?
leaf septoria?
air flow exchange good?
humidity too high?
dirty grow space?

Run off PH is 6.3
Air Flow is plenty
Humidity may be high in dark period - 75% or so - But fine when lights are on
Grow space is sparkle clean
Possible leaf Septoria - did some research on that
Thanks for the response !

 

[EnzTeef]

maybe too much potassium , quick flush and a half strength foliar feed will fix it

 

[EnzTeef]

its not septoria mate , you have red stems and yellow veins .... not you but your plant.
i would read this as a sign of mag deficiency which ties in with lockout through too much P or too much K