I hade this last year I don't know what it is but the oldest leaves turn yellow then dry @nd bro2n and it slowl6 progresses alon* the mail vine I was not giving much nitrogen a5 the moment Mabe it was n deficient bu5 8 know 8 gave fish emulsion in my compost tea (I jus5 started doing compost tea then) and it stopped I also doubled the amo7nt of seaweed extract I used