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Hi D. Broadway, It looks toHi D. Broadway, It looks to me like your plants get the blight. This disease lives in the soil and re-infects the plants from year to year. I have heard that the reason is lack of potassium. Apparently, once the plants begin to set fruit, they need extra potassium. I give mine a foliar spray very early in the morning every five days. If they don't get extra potassium at this time, the plants will take it out of their own leaves, making them susceptible to disease.

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