Late Blight is caused by the Phytophthora fungus. The fungus is always growing somewhere and releasing spores into the air, which moves on wind currents. It doesn't overwinter in your soil, so you won't need to sterilize the soil. The simple act of planting your tomatoes in a different garden spot next year should be enough. Next year you can use Seranade, Daconil, Bravo, Echo, or Fungonil to help protect your plants from blight. Follow label directions ? fungicides need to be reapplied every 7-14 days. Best wishes with your tomato plants.
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