I have a blueberry plant that has dark green leaves with tiny brown dots starting to appear on some of them, and a little bit of yellowing on a couple.
Looking at similar photos online, it sounds like this may be a calcium deficiency. I would like to hear what others think.
First, my support ticket information:
Seed Strain: ILGM Blueberry
Type(Normal, Feminized, Autoflower): Autoflower
Medium(soil in pots, DWC, Coco): soil - Fox Farms Ocean Forest
pH of runoff or solution in reservoir: 6.5 pH
Strength of nutrient mix(EC or PPM): n/a - reverse osmosis water with 6.5 pH, runoff is 700 PPM
Indoor or Outdoor grow: Indoor
Light system(CFL, HID, LED): HID - currently HPS
Light power(true watts): 750
Temperature(Day and Night): 77°F daytime, 65°F nighttime
Humidity(Day and Night): 45% day and night
Ventilation system(Yes, No, Size, CFM): Yes - 6" 440CFM
And, some photographs: