I would lower the nitrogen starting in August. Feeding a dose of nitrogen in flowering stage will make the buds unfold into 1000's of leafs(Bad). So avoid all purpose fertalizer for flowerering.
Leafs will become yellow during flowering but dont let that scare you, it makes good smoke if...
It is slightly light green it may be a little hungry. probably not a fungus.
I think Da Mann is on the right track... try feeding something more balanced in npk.
thats all i can tell and i used to moderate this area lol
hmmm hang the plant upside down with all the leaves attached in a ventilated area, or on a tree branch... wait a month, take it down leaves will come off easy, buds dried