Just started week 5 flower and I’ve been seeing rust spots on maybe 5-6 leaves on all 4 plants. Could be a few things so I cut a couple of the leaves off to be sure and slightly increased calmag last feed. Been having a humidity problem in my tent which I just ordered a dehumidifier and better ventilation kit for. So there’s those rust spots… and also on a leaf I trimmed I noticed what looks like a spider mite. Flipped the leaf over and there’s what looks like a spider mite egg. Really hard to see irl but it’s not a part of the leaf. Possible cause/treatment for these?
Did you notice any of the leaves curling with webs? My raspberries and 1 egg plant have spider mites and both had little black dots with some webbing. Spraying with some safers over next couple weeks. The damage on the leaf looks more like thrip damage to me. Had that with one of my plants.
No webs. I’m going to thoroughly check them in a few hours when I get home from work. Gloves will be worn lol
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Roger Copy !! 
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Spent an hour checking all my girls in the tent. Couldn’t find a single mite. I was wearing opaque black gloves and checked them while handling the plants and didn’t see anything. I know they are microscopic and hard to see but I was pretty thorough with the search. Yesterday I noticed a mite on my table beside the leaf I just cut which is why I thought mites were on the leaves and causing that issue
I made a new discovery, all the leaves with the affected foliage belong to the same plant. Confirmed it’s not mold or fungus as the spots do not rub off. Can’t find any trace of mites in the tent or any pest at all. So my only guesses are root rot or nutrient burn. Let me know what you think!
PS this plant I’m talking about has always been shorter and drinks less than the other plants in the tent. It’s same age as them too
Sounds like a job well done! Maybe it’s a genetics thing, or like you say, very light burn.. Have you peeked at ± VPD values? I’ll have to smoke & stretch my brain a little 
I haven’t been following a vpd chart. First grow so just keeping it simple. I had this same issue with a different plant in the tent in early veg but it recovered without me treating it. I read root rot should progress if left alone so that might not be it. Forget to mention but there’s nute burn on the tips of all the plants. Just on some of the leaves at the top of the canopy
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Did you spray them with lights on? Or could be magnesium deficiency
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@Ratch33 @Stoney1BudTokie @aman_rndhw thanks for the help, it’s been 4 days and plants are looking good besides those few leaves on the one. It’s not getting worse so thinking it was nute burn maybe from me introducing soluble enzyme to the feeding schedule a couple weeks ago. Don’t have a TDS meter so can’t measure PPM unfortunately. Maybe overwatered a bit too. Humidity has been high in the grow room but I’m getting it under control now 
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