Had these show up to his morning.

So I was doing my morning check and seen these on a Pineapple Express number 2 the other plants are still vibrant and green. But this one plant had about ten of these on it and they showed up out of nowhere. I’m running twenty gallon pots organic soil. Top dressed four weeks ago with hi yield phosphorus, 2-8-4 Gaia green , lime , and earth worm castings I water with 2 gallons at a time with a little runoff i use recharge , silica , and Epsom salt in my last water 2 days ago. I use two 650 rspec scorpions at 24 inches on 100% right now 4 weeks into flower. Is it a deficiency.
what do you think. I think I added in some happy frog bloom food also when I did that top dressing. Planned on top dressing again here this week.

Better advice with pictures showing the entire plant. But it’s probably potassium deficiency.

That’s what I was thinking.

I made some potassium water lol I added 1/4 cup potassium hi yield and some happy frog bloom food to two gallons water letting it dissolve over the next day and gonna add some to all them.

the plant directly above the auto at the bottom of the picture is the one in question it has good color mostly everywhere just a few under the net leafs are doing that. But potassium def is what I was thinking especially where I’m at in flower.

Could be a Nitrogen Deficiency. If that's a lower leaf sometimes they just die out like that. If the pics of your plants are up to date with those leaves then I'd say you're fine and are just overthinking it.

I don't think it's potassium. All toxicities and deficiencies can show up different, but potassium you get more if a nutrient burn look to it. Some signs to help you narrow it down would be where did it start, upper or lower leaves, and the fact it's yellowing from the petiole out. Closer to the margins you still have some green on it. Did it fall off or did you cut it off?

SpideyManDan said:

I don't think it's potassium. All toxicities and deficiencies can show up different, but potassium you get more if a nutrient burn look to it. Some signs to help you narrow it down would be where did it start, upper or lower leaves, and the fact it's yellowing from the petiole out. Closer to the margins you still have some green on it. Did it fall off or did you cut it off?

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It was on top leafs and bottom ones it came out of nowhere I cut them off and a few had fallen off it irks me because I have five others grown the same way that haven’t shown any signs like this.