Pauline Smiddy asked 15 years ago
I’ve been spraying my potatoes with the bluestone mixture (copper sulphate & washing soda) but have noticed that the leaves near to the root of the plants are turning yellowish with brown scabs…is this blight? If so, is there anything further I should be doing?
1 Answers
Gerry Daly Staff answered 6 years ago
When occasional stems turn yellow and blacken at ground level, it is a disease called potato black leg, and the plant should be removed. It is a seed borne disease and you should use new seed potatoes, not your own saved seed.
