Nearing harvest and now brown tips and edges on the largest Cola

Grow Support Autoflowers
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I am very nervous since killing my other plant from to high a nutrient watering. This latest plant has been doing so well until discovering some brown tips and sides on some leafs affecting only one cola.
This ia a GSC Extreme and I believe about 3 weeks from harvest.

Happy Frog medium
600 W LED at 14" to 18" distance
Room Temp 64F to 78F with air circulation
Ph averages 6.8 to 7.1
About 10 days ago I thinned the Fan leafs and then 2 days ago I defoliated all or most of the remaining fan leaves and Fertilized “lightly” as well as plain water at room temp.
After I saw the leafs I flushed the pot thinking it could have become to hot a fertilizer even though it was maybe 20%.
I’m very concerned and don’t want to lose this plant so close to being done.
What other info can you use to help?
Desperate in the midwest!
Wayne

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What was the PPM of said nutrient solution?
It looks like nutrient burn, and you already flushed, so you should be alright. That leaf won’t recover. @Wayne1956

Welcome to ilgm.

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Welcome to the forum Wayne.

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Thank you Covert. This was my conclusion but its always a relief to hear from the experts!
Again, Thank you

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Thanks Bubble

Its always nice to have like minded souls willing to share and help out.

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