20% yellow leaves, some with tiny red dots

Continuing along the lines of my post about the leaves on my blueberry plant, I thought I would post about this one. Right now about 20% of the leaves are turning yellow. A few of them (see the second photo) have tiny red dots on them.
I suspect that, like the blueberry plant, this one is also just following it’s natural progression late in flower. But, I want to be certain and I also want to get better at identifying deficiencies.
So - I believe the yellow is just indicative of a nitrogen deficiency. The red dots however… the closest I could find in my photos of deficiencies I’ve collected is a manganese deficiency. But it doesn’t look exactly the same, so I’m not sure.

Support ticket info:
Seed Strain: ILGM Northern Lights
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 runoff
Strength of nutrient mix(EC or PPM): n/a - reverse osmosis water with 6.5 pH, runoff is 1100 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

Here’s the one with the tiny red dots:


Is it only on the already dying leaves or the healthy green ones too?

Only on the yellow, dying leaves.

Your plants look right on track for a good harvest: good structure and color to the leaves, the dying leaves are fans and the red spots are likely just decaying plant material as that leaf is dead dead dead haha.


Yep, I agree 100% Nice job TommyBahama!

I agree with everyone else. She looks like she’s showing you her autumn colors. Finishing nicely. :sunglasses:

Thanks, but I was looking more for a consensus on nutrient excess/deficiency to assist in identification for future grows. Pretending for a moment that this plant was still in the vegetative state, do you think the yellowed leaves would be indicative of a nitrogen deficiency?