Interestingly I had the same issue last year, leaves looking like that, pale new growth, terrible buds if the plants didn’t die.
Lost 2 crops and fixed it with aspirin in the water every day, plant vitality plus silver bottle ( banned now I think ) and fungus clear and rose clear.
Not lost anything at all this year but I’m still using all the above in rotation.
I could never figure out what was the cause and yes if it carried on I would have been ruined!
Good luck getting back on your feet fella
Lost 2 crops and fixed it with aspirin in the water every day, plant vitality plus silver bottle ( banned now I think ) and fungus clear and rose clear.
Not lost anything at all this year but I’m still using all the above in rotation.
I could never figure out what was the cause and yes if it carried on I would have been ruined!
Good luck getting back on your feet fella