Rotate the veggies is always a good idea. Never plant the same thing in a spot you did the previous year. We had tomato blight here despite the fact I started my own plants. I understand it came up from the south via infected plants. You were supposed to burn the infected plants which we did. This year I am using big pots for my tomatoes and not planting them in the ground, just in case. Last year I lost all my tomato plants, but not the ones in pots. Good luck.
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