Brown spots on leaf tips/edges and top of canopy (scattered throughout)

It's rust fungus. I had the exact same problem. It took me 2 years and 6 wasted grows that cost me thousands of dollars to find the answer. Solution is commercial fungicid like Myclobutanil, Trifloxystrobin or Difenoconazole. My plants looked exactly like yours.

It's rust fungus. I had the exact same problem. It took me 2 years and 6 wasted grows that cost me thousands of dollars to find the answer. Solution is commercial fungicid like Myclobutanil, Trifloxystrobin or Difenoconazole. My plants looked exactly like yours.

Bro, look through my photoperiod MOAB diary. look at my feed schedule. your way to high for auto's., just look at your plant, then look at mine with lower feed than your autos. your disagreeing with a seasoned 46 year grower. If you don't want to learn, then don't waste our time...

Doesn’t mean the plant is taking up 1400 ppm tho dude.. so I highly disagree with your highly disagreeing

My reservoir pH was at 5.9, so I just lowered feed by a little. Dropped it down to 950ppm and they are not getting worse. Defoliated and took off bad leaves, so I will know if it gets better or worse. I highly disagree with the comment that autos only uptake 650ppm of nutrients as my friend who has grown in coco for years usually works up to about 1400ppm depending on strain.

It is starting to freak out from growing for weeks and weeks without sleep! Cannabis NEEDS sleep! Without sleep, no plant can complete the photosynthesis cycle and have a correctly functioning metabolism! You will not lose anything by going to 18/6, in fact you may gain much by having a much healthier plant! The myth that it is ok to grow cannabis at 24/0 and without sleep for weeks/months on end needs to be removed from every website in the World! 24/0 could only be recommended by people who don't understand photosynthesis, or how plants function, or perhaps both principles! Please, please go to 18/6, reduce your feeding and up your pH a bit and hopefully she will recover.

Yeah, it's low PH on flowering. I had a same problem with my last grow, but the leaves wasn't damaged so badly. Just turn your PH to normal, it will live, it's not the end of a Uniwerse. ;-)

If you need any more help hit up your DM's Your inbox is the little green arrow on the bottom right hand corner. Good Luck!

I'm along the same line as gmslave with regards to PH, I'd want to raise that PH up an bit to 6.2-6.3 I had a different response typed out as I thought this was a photoperiod strain but it is indeed an auto. weird that I did not see that listed on the strains profile here on GD. little misunderstanding. any who, An EC of 2.3 for an auto is way to hot, they like stuff lower and they max out aorund 1.2EC This link is a good reference point for feeding autos. It's not 100% accurate for all grows, you will need to adjust for thing if it wants more or less. https://www.autoflower.net/forums/threads/med-man-method-feeding-chart-ppm-ec.47856/ If this was my grow I would lower that EC down and monitor for more signs of it needing food from there. Checking reservoir levels and numbers every 24hrs. Best Of Luck!

Yeah Gmslave said what I was going to say. Your PH is too low for flowering.

your overfeeding by about 500 ppm. autos only need about 600 to 650 and your ph is set for vegetation. 6.2mto 6.3 for flowering. Check your runoff waters ph and ec and bring it back to proper levels.

Some leaves are totally fine, others not, and its at different levels in the canopy.