i have a similar problem with my leaves; and the causes are many in my case, from some soil problems (organic mix) and organic fertilizers, to aphids and white flies and who knows what else i was told to even consider the yellowing and drying of leaves in such a fashion to be a type of fungus.
so far what has helped a lot is to feed with liquid humus, as it helps stabilize the pH. but you are going all chem so i dunno if this may work for you. also, controlling the bug populations with environmentally friendly recipes has helped, the plants keep growing and becoming a bit healthier each week.
good luck. peace.
so far what has helped a lot is to feed with liquid humus, as it helps stabilize the pH. but you are going all chem so i dunno if this may work for you. also, controlling the bug populations with environmentally friendly recipes has helped, the plants keep growing and becoming a bit healthier each week.
good luck. peace.