Blight...?

So my tatties have been growing amazingly well. Popped to lottie today...& in the middle of my tattie patch is suddenly a 'baldy patch' where the plants look like they're dying off. Now normally I wouldn't be concerned, but these were planted about 3 weeks after my first lot...the first lot are still flowering & these ones are showing leaves like this...blight or a deficiency? With all the rain & humid weather we've had - blight wouldn't surprise me at all.

 

Blight can begin with yellow leaves, then turns brown going to black, I would err on the side of caution and remove the yellow leaves and check them daily, remember not to put the leaves in the compost as this will spread the disease, have a look for white fungal threads on the underside of the leaves.

 

I've noticed that often the lower leaves do go yellow especially if overshadowed by the ones above.

I've been looking for blight on my toms, I must admit, if it doesn't stop raining soon it could be a total disaster year.