First time poster/first time grower, but long time lurker. I'm posting now because I'm really stumped with whats wrong, so I'm hoping that you guys will be able to assist and help me ID these problems.
Soil (Canna Terra w/20% perlite)
Water every day, nute feed (1/2 Lucas formula + cal/mag) every 2nd day
PH: 6 going in, about 7 coming out (approximately)
20 degrees temp, 50% humidity
4" extract fan through carbon filter
2 x OG Kush (autoflower) - 4 weeks
2 x Jack Herer (photo-period) - 2 months
* Yes - I know its weird mixing an auto and a photo-period. I will be passing the Jack on to a friend soon, but at the moment I am running both on 24 hour lights schedule (to maintain temps).
As you can see in the photos, I have 2 separate problems.
The Jack has started to turn yellow at the base of the plant and this is spreading to new growth. Is this maybe nutrient defficiency or root rot? These plants are in 2 gal pots
The OG has been getting these really weird brown/rust coloured spots on it. It is spreading to the new growth as well. I'm more worried about these than the Jack tbh...is this a fungi?
Any help would be greatly appreciated, I would hate to lose these girls!
Thanks in advance!