Hot and humid is fine. As long as the air is moving and gets refreshed.
It seems very selective and not spread out. Any chance nute burn from spill or foliar spray?
Thanks for the backup. Mites I know. This is different but I don’t know what.
I'm thinking PH swings could be an issue
Other than the torn spot in the one leaf ... my thoughts are also pH swing issues.
If it's nute deficiency I would think it would be phosphorous that would be deficient at this time in growth as that would be what was used up the most from flip to flower. I like to raise my PH to around 7.5 right after flip. pH chart says P becomes more available in that pH range along with calcium and magnesium. I do that for first 2 weeks introducing elevated levels of calcium and magnesium after the first week of flip.
I see on the chart that at 7.5 copper is no longer available....does that cause issues? I've always tried for a happy medium 6.2 - 6.8 I see the chart and wondering what a higher ph will do plants as far as losing the ability to take up other minerals.......
I didn't mention that after week 3 I drop pH back down to around 6.8 to taper off P and start making the minerals available again. I do that for around a week then I drop it a little further down to around 6.3 - 6.5. I'm currently in week 2 going into week 3 of flower and just gave them a 7.5 drink. Next feed will be the last feed at 7.5. After that a couple of feeds at 6.8 then down to 6.5 to the end.
