30/07 - Beginning of week 4 in veg. I am continuing with LST and defoliation.
01/08 - Spreading the plant a little bit to shed some light on the inner nodes.
03/08 - The plant seems healthy. No signs of flower yet. The LST is doing very well. Also, I topped the plant, don't know if it was too late for that, hope this goes well.
05/08 - Last day in week 4 in veg. Can't wait to see this plant in flower! Continuing with LST, leaf tucking, and defoliation.
Only on one leaf of one plant. Is this some fungus or virus?
It looks a bit like coffee rust, but I couldn't find anything else like it.
How should I proceed?
Thanks in advance!
Pretty certain this is Leaf Spot Fungus otherwise known as Rust Fungus... and you'll need to jump on this quickly as it spreads fast... it spreads by spores that you can't even see so don't think you've got any time to waste here... I won't go into all the details of what you need to do as this article is very thorough.. Do give it a read and get going so you don't lose your entire grow...
https://www.urbanorganicyield.com/rust-spots-on-leaves-during-flowering/
Good luck!