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Light burn? Nute burn

Hey guys I'm half way thru week 4 flower and my leafs all off sudden starting getting the spots...any idea what it could be ? Light burn? Thanks for any help

Spiderfarmer 4000 at 30 inches

80-85 temps

Co2 1500ppm

Humidity @60

7 comments

Comments (7)

Cap Stone

Jul 16, 2021

Hi, those dark patches on the leaves look similar to PH damage. A PH issue could cause some of those other symptoms as well.

Week 4-5 of flower is often where people encounter lock-out problems if they have been feeding with bottled nutrients a lot. If that is the case then usually a good flush with PH'd water solves the issue.

VRTLYCHALNGD

Jul 19, 2021

Replying to

@am420 I definitely wouldn't be feeding that often. I water my plant every few days at most and only feed every other watering at 1/2-3/4 of what the bottle says. Granted i take a very conservative approach but id say you are definitely overfeeding. Flush next watering with 7.0

VRTLYCHALNGD

Jul 19, 2021

Replying to

also doesn't help that your temps are on the high side, nutrient uptake is disrupted and a lot of it is just sitting in your soil id say.

Goodluck!

Mr. Grow It

Jul 21, 2021

Replying to

@am420 Which TDS tester are you using? Some have a flashing 10x symbol in the top right corner. If you have that showing when you take the measurement, then you are actually 2000 PPM. That could mean a lockout. I ask because you feeding 3x a week and only having 200PPM doesn't make sense.