If would advise to put the blighted tomatoes and tomato plants in your own composters. The fungus will be killed off by winter cold and the summer heat.
Keep the disease local and don't spread it to a wider region.
You should go under the assumption that blight is ever present as components of it stay viable in the soil, that their spores are carried in the wind and water.
It is only when the blight fungus tries to complete its lifecycle by reproducing on a host under suitable warm and humid conditions do you get the tell-tale damage.
In a large field, it is not viable or possible to screen every inch of soil in order to eliminate over-wintering host plant materials (eg potato tubers) left behind after the harvest. That is why it is advised not to grow a similar crop in the same field for a few years.
However, on a smaller plot such as a back garden, it is perfectly feasable to do just that and you could grow the same crop again - only, manage it better the next time around.
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Keep the disease local and don't spread it to a wider region.
You should go under the assumption that blight is ever present as components of it stay viable in the soil, that their spores are carried in the wind and water.
It is only when the blight fungus tries to complete its lifecycle by reproducing on a host under suitable warm and humid conditions do you get the tell-tale damage.
In a large field, it is not viable or possible to screen every inch of soil in order to eliminate over-wintering host plant materials (eg potato tubers) left behind after the harvest. That is why it is advised not to grow a similar crop in the same field for a few years.
However, on a smaller plot such as a back garden, it is perfectly feasable to do just that and you could grow the same crop again - only, manage it better the next time around.