This section is from the book "Commercial Gardening Vol4", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This fungoid disease, caused by Nectria Solani, attacks stored potatoes, especially in moist or dark and warm situations. The skin begins to shrivel and shrink, and white patches of fungus appear on the surface, and in due course the crop of spores produced affect surrounding tubers. To prevent attack, potatoes should be stored in cool, dry, and well-ventilated places, and even then not in great heaps, but in flat layers if possible. The tubers should be thoroughly dry before storing, and flowers of sulphur may be sprinkled over and about them to kill or check the fungus. Any diseased tubers should be picked out from time to time and burned.
The worst of these are the Millipedes or Julus Worms and Wireworms. The former are often present in badly cultivated but highly manured soil, and cause a scabby appearance on the tubers. Wireworms are generally present in freshly broken-up pasture land, and can only be eradicated by frequent digging or ploughing, and by encouraging crows, chickens, and other birds to pick them out of the freshly broken soil.