Signs of potato blight

QuestionsSigns of potato blight
Colman O'Reilly Staff asked 13 years ago

I have what appears to be a good healthy crop of Record potatoes. However on closer inspection quite a few of the leaves have little holes in them and the outer tips of same are discoloured with a dark blue/purple tinge.I have already sprayed them with Dithane 945 approx. a couple of weeks ago and intend to do again now.Should I be concerned ?