The reason i suspect heat stress is because the yellowing is worst in the middle and the outside branches which don't get as much light are still quite green. The light has been close enough to feel quite warm on my hand and the fan i have running in the room blows air from the bottom up towards the plants (i.e. no real breeze over canopy).
My main concern is the little leaves poking out of the buds which are becoming yellow. The fan leaves get cut off anyway so i don't mind them looking like shit, but not the buds.
My main concern is the little leaves poking out of the buds which are becoming yellow. The fan leaves get cut off anyway so i don't mind them looking like shit, but not the buds.