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My bet is on Xanthomonas (campestris). Perhaps it isn't a 100% match, but out of all the possible options this bacterial infection comes the closest. Copper-based fungicides are the only sprays that are effective against it (avoid using pure copper sulfate though, that would burn the leaves!). The affected leaves should be immediately removed and the plant ...


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If your tomatoes aren't protected in a greenhouse, then the first frost will mark the end of your tomato season. Tomatoes are tender plants that will be injured or killed even by light frosts. For frost dates by location, see Farmer's Almanac. Your last and first average frost dates provide an estimate of your annual growing season, and the months tender ...


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