17/08 - I had a 5 days travel, which worried me a little, mainly because my irrigation system did not arrive in time. But when I came back the plant seemed very healthy. The medium was dehydrated but as you can see even after some defoliation the plant continues to be very bushy.
19/08 - Very wide canopy! I have a 60x60cm tent and half of it it's taken by the Gelat. Og. Had to rearrange the tent. The Gelat. OG is little bit ahead of the other plant.
21/08 - Did defoliation to open more the canopy.
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!