[NASH]

I live about 1 mile from my plot which has been hit hard over the last month with blight, it got my late planted maincrop potatoes and my Tomatoes but why has it not touched my Tomatoes growing outdoors at home ?

The postcode covered by blight alerts is the same for allotment and garden.

[mumofstig]

The conditions in the garden may not suit blight quite so much, or it may just be that you are far enough away from the spores that started the outbreak on the plot

Who knows, just be glad that, so far, your homegrown toms are ok 

[JayG]

A blight alert is not a guarantee your crops will get blight any more than a lack of a warning is a guarantee that they won't!

It's all a bit of a lottery in some ways where local conditions, including how many blight-prone plants are being grown in your area, wind direction, local microclimate (high humidity) and so on also play a part.

[paintedlady]

allotments are always at higher risk anyway - not everyone recognises blight symptoms until too late (or have and just given up leaving the plants to fester) and the spores then spread quickly to neighbouring plots and so on and so forth increasing the risk of blight as the spore levels in a small area soar. 

Same goes for pests, plant diseases and weeds .........

[NASH]

I think next year I will only do earlies and mids especially as I had such a good crop of Vivaldi which are the best tasting roasties ever, in the west we get so much rain in August that blight is guaranteed.