Leafs turning a rust color

I have 3 auto blueberry plants. 2 are fine, but the leafs on this one are getting spotty with this rust color. They are all 3 bunched together in my grow tent.
The Trichomes are mostly clear. I’m wondering if I should just harvest it now before it dies, or if this can be treated. Thanks!!

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Looks like you might try some potassium .

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If you’re close to harvest I would just stick with ph’d water.

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yep… That’s about all you can do. At this point she is not recovering. You can ride it out as she still has foliage to eat. You can get at least a week out of her. If leaves are completely dying in 1-2 days then she’s root bound also.