certain conditions that produce the conditions necessary for blight to 'take hold'. These conditions are two consecutive days when the temperature is 10 degrees centigrade or above and also that on those days the humidity is more than 90% for 11 hours or more. This two day weather 'window' is known by the name of a Smith period. Leaf wetness is also needed for infection to happen.
You can find out about the 'Smith' periods of weather on the internet.
If blight does strike then follow the advice on how to deal with your crop to minimise the potential damage and also the risk of spreading the blight. The foliage of your potatoes might be the first sign that something needs to be done.
It is worth remembering that tomatoes also suffer from blight too.
Here at the RHS site are photos of the foliage on blighted potatoes if you need to check.
link to Royal Horticultural Society page
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Growing Your Own Fruit and Vegetables
We grow our own fruit and vegetables for our meals for as much of the year as we can. Without a greenhouse we have to buy shop food in the winter months but in the spring, summer and autumn we often have enough to share with family and friends.
Read about growing your fruit and vegetables here on my growing your own food pages.