I had this problem with one of my plants last grow, nasty plague like lookin shite, black spots covering leaves, came thick and fast last time. Noticed it on most the big leaves at the bottom tucked away and one ( the smaller one) in the middle. After looking at a chart maybe it's potassium def? Or maybe Leaf septoria? Only been fed twice starting on 18/4. First time 1/2 ml per ltr of veg/bloom and 2nd feed was 1ml veg / 2ml bloom per ltr, takes about 3-4 ltrs each time. Maybe just underfeeding as its nearly twice as big as the other 2?
I'll add aswell that the lower leaves affected have gone yellow too like they're slowly being drained
Soil or hydro or coco: SOIL
Strain: PURPLE LEMONADE
Photo or Auto: AUTO
plant age: ABOUT 5-6 WKS
pot size: 16 LTR
has it been repotted? and when?: YES ABOUT 2 WKS OLD-- 3-4 WKS AGO
soil type: PLANTMAGIC PLUS
nutes or additives used and how often for soil: ORGANIC PLANT MAGIC FED TWICE IN 8 DAYS AT 1/2 ML VEG/BLOOM PER LTR...2ND TIME 1ML VEG AND 2ML BLOOM
Air temps (max min):25-27C
Res temps (max min):
humidity:40-50%
lighting type and wattage (hps, led, cfl): 150W IS LED @ 100W + 250 DUAL SPEC HPS
Light schedule: 24
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