m0useanswered grow question 9 months ago Is this on any of your active diaries?
It looks like its nearing the end of its life and might just be natural fade aka senescence. Your pistils re mostly dry and the plants are extremely frosty, it sin week 7-8 of flower.
It does mimic potassium deficiency but your so close to harvest I would not worry about anything. Just water and chop in a few days.