Finding a few of these spots on one of my two plants. I'm nearly positive it's manganese excess and not a deficiency. I'm using plenty of nutrients and pH is around 6.7 on a slurry test (6.5 going in) so it shouldn't be a calcium lockout. I'm thinking I'm using too much nutes. Using nectar for the gods sample kit.
definite too much food...the green looks almost blackish ...too many of one element locks out another...so you do essentially have a deficiency..BUT ..it's caused my too much of another fert...back of the feed and flush with 1/4 strength nutes until that stops and the new growth returns to normal... .don't worry about those leaves they won't come back.to 100%..just the new growth should be OK....watch the runoff ph ...it needs to stay in range for feeding to work properly. GFP Sent from my SM-G600FY using Tapatalk