All I know is that when I see the yellow leaves starting, I start spraying every night or 2 with bleach spray and start picking leaves off for rest of season - works for me - no grafts and plants produce and outrun the decease (whatever it is) till they are done producing. The indeterminates and heirlooms for the most part respond well to the bleach spray and last easily through the season and still going strong as we speak with very few yellow leaves.
Pete
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