It is always hard to be certain about blight because there are many harmless bacteria that attack leaves and look very similar.
Bacteria get into the leaves though damage caused by wind - which we have had a lot of recently so it is no surprise to see leaves affected. I get some leaf damage every year - it it harmless !!!!
I have marked your picture 1 and 2.
From the image 1 looks like constant black over the "stain" which is like a standard bacteria attack.
However, 2 seems to have a white centre to the "stain" which could be blight.
Don't forget that if it is blight it will destroy the plant very quickly - a couple of days - so if you have had the black bits for some time it is unlikely to be blight.
Bacteria get into the leaves though damage caused by wind - which we have had a lot of recently so it is no surprise to see leaves affected. I get some leaf damage every year - it it harmless !!!!
I have marked your picture 1 and 2.
From the image 1 looks like constant black over the "stain" which is like a standard bacteria attack.
However, 2 seems to have a white centre to the "stain" which could be blight.
Don't forget that if it is blight it will destroy the plant very quickly - a couple of days - so if you have had the black bits for some time it is unlikely to be blight.
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