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Cause of Potato Scab. The cause of common potato scab is a bacterium, Streptomyces Scabies, found in the soil. It is most common on light, sandy soils, low in organic matter. Soils that were previously grassland are particularly liable to having the disease. Soils with a high pH (recently limed) provide a better environment for the bacteria.
Infecting potato vines through flying spores, grey mold is a fungus that can decimate a potato vine, especially if there is an injury to the plant's exterior.The fungus finds its way into the vine's injury, or even onto healthy leaves, and grows exponentially. Fuzzy mold will cause dieback of leaves and flowers.nfecting potato vines through flying spores, grey mold is a fungus that can decimate a potato vine, especially if there is an injury to the plant's exterior.