For early blight, once the tomato plant is established, I always put a piece of copper wire through the stem, just above the soil. However, this will not stop late blight, as it comes from the air not the soil.
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My tomatoes had blight last year. Can I safely plant other plants in this spot, such as cucumbers? Thank you.
Yes, you can just don't plant tomatoes there,good luck.
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.