Really blight, or just that the first Smith Period happens around the time of first early die back. After all, we've had several full periods in this area, but only one confirmed outbreak in a commercial crop in the vicinity, and we have some big organic potato producers in the area.
I scouted the allotments the other day, no blight to be seen anywhere. Though I was told I had blight on my earlies, by another plot holder, it was not blight, just dieback.
People never seem to question why their earlies are 'infected' but the rest of their crop untouched.