crop rotation - how important?

[pharmerphil]

Before planting your tomatoes,,,,
spray your soil in the raised bed with Straight brown bottle Hydrogen peroxide, turn under and repeat...Then, after your tomatoes are in the ground..
AS A PREVENTIVE...spray the plants with a mixture of: 1 cup peroxide to 1 gallon of water.

Fungus/blight/Disease can only be prevented, never cured

[Sunnydays]

I think there isn't much you can do about the fungus in your soil, chances are it was there long before you started gardening and will there long after. As for your question about rotation I also think that it is important.If you keep planting the same plants in the same spots the yields will get smaller each year.