No nutes, It's called fading and it should yellow a lot more. When my plants are done every sun leaf has fallen off and the sugar leaves are just starting to turn. The burnt ash is snow white and the taste is delicious! just let it go...
Scorched earth policy is the ONLY thing that truly works. The fight is not worth it and putting ANYTHING on your plants to control pests or mildew proves one thing. Your doing something wrong... Clean everything, no, sterilize everything and start over from seed.