A fungal disease that affects plant tissues has been detected in Prince Edward Island potato crops.

Black dot disease — named for the fine black spots that appear on infected roots, stems and leaves — is typically brought in on infected seed and spreads through soil, said Julie Pasche, associate professor and chair of potato pathology at North Dakota State University. 

Pashe said that once the pathogen is in a field it will remain in the field for quite some time and build up with each additional…